text: /**************************************************************************
   *
   * Copyright 2009 Marek Olšák <maraeo@gmail.com>
   *
   * Permission is hereby granted, free of charge, to any person obtaining a
   * copy of this software and associated documentation files (the
   * "Software"), to deal in the Software without restriction, including
   * without limitation the rights to use, copy, modify, merge, publish,
   * distribute, sub license, and/or sell copies of the Software, and to
   * permit persons to whom the Software is furnished to do so, subject to
   * the following conditions:
   *
   * The above copyright notice and this permission notice (including the
   * next paragraph) shall be included in all copies or substantial portions
   * of the Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
   * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
   * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
   * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
   * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
   * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
   * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
   *
   **************************************************************************/
  
  /**
   * @file
   * Blitter utility to facilitate acceleration of the clear, clear_render_target,
   * clear_depth_stencil, and resource_copy_region functions.
   *
   * @author Marek Olšák
   */
  
  #include "pipe/p_context.h"
  #include "pipe/p_defines.h"
  #include "util/u_inlines.h"
  #include "pipe/p_shader_tokens.h"
  #include "pipe/p_state.h"
  
  #include "util/u_format.h"
  #include "util/u_memory.h"
  #include "util/u_math.h"
  #include "util/u_blitter.h"
  #include "util/u_draw_quad.h"
  #include "util/u_sampler.h"
  #include "util/u_simple_shaders.h"
  #include "util/u_surface.h"
  #include "util/u_texture.h"
  #include "util/u_upload_mgr.h"
  
  #define INVALID_PTR ((void*)~0)
  
  struct blitter_context_priv
  {
     struct blitter_context base;
  
     struct u_upload_mgr *upload;
  
     float vertices[4][2][4];   /**< {pos, color} or {pos, texcoord} */
  
     /* Templates for various state objects. */
  
     /* Constant state objects. */
     /* Vertex shaders. */
     void *vs; /**< Vertex shader which passes {pos, generic} to the output.*/
     void *vs_pos_only; /**< Vertex shader which passes pos to the output.*/
  
     /* Fragment shaders. */
     /* The shader at index i outputs color to color buffers 0,1,...,i-1. */
     void *fs_col[PIPE_MAX_COLOR_BUFS+1];
     void *fs_col_int[PIPE_MAX_COLOR_BUFS+1];
  
     /* FS which outputs a color from a texture,
        where the index is PIPE_TEXTURE_* to be sampled. */
     void *fs_texfetch_col[PIPE_MAX_TEXTURE_TYPES];
  
     /* FS which outputs a depth from a texture,
        where the index is PIPE_TEXTURE_* to be sampled. */
     void *fs_texfetch_depth[PIPE_MAX_TEXTURE_TYPES];
     void *fs_texfetch_depthstencil[PIPE_MAX_TEXTURE_TYPES];
     void *fs_texfetch_stencil[PIPE_MAX_TEXTURE_TYPES];
  
     /* FS which outputs one sample from a multisample texture. */
     void *fs_texfetch_col_msaa[PIPE_MAX_TEXTURE_TYPES];
     void *fs_texfetch_depth_msaa[PIPE_MAX_TEXTURE_TYPES];
     void *fs_texfetch_depthstencil_msaa[PIPE_MAX_TEXTURE_TYPES];
     void *fs_texfetch_stencil_msaa[PIPE_MAX_TEXTURE_TYPES];
  
     /* Blend state. */
     void *blend_write_color;   /**< blend state with writemask of RGBA */
     void *blend_keep_color;    /**< blend state with writemask of 0 */
  
     /* Depth stencil alpha state. */
     void *dsa_write_depth_stencil;
     void *dsa_write_depth_keep_stencil;
     void *dsa_keep_depth_stencil;
     void *dsa_keep_depth_write_stencil;
  
     /* Vertex elements states. */
     void *velem_state;
     void *velem_uint_state;
     void *velem_sint_state;
     void *velem_state_readbuf;
  
     /* Sampler state. */
     void *sampler_state;
  
     /* Rasterizer state. */
     void *rs_state;
     void *rs_discard_state;
  
     /* Viewport state. */
     struct pipe_viewport_state viewport;
  
     /* Destination surface dimensions. */
     unsigned dst_width;
     unsigned dst_height;
  
     boolean has_geometry_shader;
     boolean vertex_has_integers;
     boolean has_stream_out;
     boolean has_stencil_export;
  };
  
  
  struct blitter_context *util_blitter_create(struct pipe_context *pipe)
  {
     struct blitter_context_priv *ctx;
     struct pipe_blend_state blend;
     struct pipe_depth_stencil_alpha_state dsa;
     struct pipe_rasterizer_state rs_state;
     struct pipe_sampler_state sampler_state;
     struct pipe_vertex_element velem[2];
     unsigned i;
  
     ctx = CALLOC_STRUCT(blitter_context_priv);
     if (!ctx)
        return NULL;
  
     ctx->base.pipe = pipe;
     ctx->base.draw_rectangle = util_blitter_draw_rectangle;
  
     /* init state objects for them to be considered invalid */
     ctx->base.saved_blend_state = INVALID_PTR;
     ctx->base.saved_dsa_state = INVALID_PTR;
     ctx->base.saved_rs_state = INVALID_PTR;
     ctx->base.saved_fs = INVALID_PTR;
     ctx->base.saved_vs = INVALID_PTR;
     ctx->base.saved_gs = INVALID_PTR;
     ctx->base.saved_velem_state = INVALID_PTR;
     ctx->base.saved_fb_state.nr_cbufs = ~0;
     ctx->base.saved_num_sampler_views = ~0;
     ctx->base.saved_num_sampler_states = ~0;
     ctx->base.saved_num_vertex_buffers = ~0;
     ctx->base.saved_num_so_targets = ~0;
  
     ctx->has_geometry_shader =
        pipe->screen->get_shader_param(pipe->screen, PIPE_SHADER_GEOMETRY,
                                       PIPE_SHADER_CAP_MAX_INSTRUCTIONS) > 0;
     ctx->vertex_has_integers =
        pipe->screen->get_shader_param(pipe->screen, PIPE_SHADER_VERTEX,
                                       PIPE_SHADER_CAP_INTEGERS);
     ctx->has_stream_out =
        pipe->screen->get_param(pipe->screen,
                                PIPE_CAP_MAX_STREAM_OUTPUT_BUFFERS) != 0;
  
     ctx->has_stencil_export =
           pipe->screen->get_param(pipe->screen,
                                   PIPE_CAP_SHADER_STENCIL_EXPORT);
  
     /* blend state objects */
     memset(&blend, 0, sizeof(blend));
     ctx->blend_keep_color = pipe->create_blend_state(pipe, &blend);
  
     blend.rt[0].colormask = PIPE_MASK_RGBA;
     ctx->blend_write_color = pipe->create_blend_state(pipe, &blend);
  
     /* depth stencil alpha state objects */
     memset(&dsa, 0, sizeof(dsa));
     ctx->dsa_keep_depth_stencil =
        pipe->create_depth_stencil_alpha_state(pipe, &dsa);
  
     dsa.depth.enabled = 1;
     dsa.depth.writemask = 1;
     dsa.depth.func = PIPE_FUNC_ALWAYS;
     ctx->dsa_write_depth_keep_stencil =
        pipe->create_depth_stencil_alpha_state(pipe, &dsa);
  
     dsa.stencil[0].enabled = 1;
     dsa.stencil[0].func = PIPE_FUNC_ALWAYS;
     dsa.stencil[0].fail_op = PIPE_STENCIL_OP_REPLACE;
     dsa.stencil[0].zpass_op = PIPE_STENCIL_OP_REPLACE;
     dsa.stencil[0].zfail_op = PIPE_STENCIL_OP_REPLACE;
     dsa.stencil[0].valuemask = 0xff;
     dsa.stencil[0].writemask = 0xff;
     ctx->dsa_write_depth_stencil =
        pipe->create_depth_stencil_alpha_state(pipe, &dsa);
  
     dsa.depth.enabled = 0;
     dsa.depth.writemask = 0;
     ctx->dsa_keep_depth_write_stencil =
        pipe->create_depth_stencil_alpha_state(pipe, &dsa);
  
     /* sampler state */
     memset(&sampler_state, 0, sizeof(sampler_state));
     sampler_state.wrap_s = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
     sampler_state.wrap_t = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
     sampler_state.wrap_r = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
     sampler_state.normalized_coords = 1;
     ctx->sampler_state = pipe->create_sampler_state(pipe, &sampler_state);
  
     /* rasterizer state */
     memset(&rs_state, 0, sizeof(rs_state));
     rs_state.cull_face = PIPE_FACE_NONE;
     rs_state.gl_rasterization_rules = 1;
     rs_state.flatshade = 1;
     rs_state.depth_clip = 1;
     ctx->rs_state = pipe->create_rasterizer_state(pipe, &rs_state);
  
     if (ctx->has_stream_out) {
        rs_state.rasterizer_discard = 1;
        ctx->rs_discard_state = pipe->create_rasterizer_state(pipe, &rs_state);
     }
  
     /* vertex elements states */
     memset(&velem[0], 0, sizeof(velem[0]) * 2);
     for (i = 0; i < 2; i++) {
        velem[i].src_offset = i * 4 * sizeof(float);
        velem[i].src_format = PIPE_FORMAT_R32G32B32A32_FLOAT;
     }
     ctx->velem_state = pipe->create_vertex_elements_state(pipe, 2, &velem[0]);
  
     if (ctx->vertex_has_integers) {
        memset(&velem[0], 0, sizeof(velem[0]) * 2);
        velem[0].src_offset = 0;
        velem[0].src_format = PIPE_FORMAT_R32G32B32A32_FLOAT;
        velem[1].src_offset = 4 * sizeof(float);
        velem[1].src_format = PIPE_FORMAT_R32G32B32A32_SINT;
        ctx->velem_sint_state = pipe->create_vertex_elements_state(pipe, 2, &velem[0]);
  
        memset(&velem[0], 0, sizeof(velem[0]) * 2);
        velem[0].src_offset = 0;
        velem[0].src_format = PIPE_FORMAT_R32G32B32A32_FLOAT;
        velem[1].src_offset = 4 * sizeof(float);
        velem[1].src_format = PIPE_FORMAT_R32G32B32A32_UINT;
        ctx->velem_uint_state = pipe->create_vertex_elements_state(pipe, 2, &velem[0]);
     }
  
     if (ctx->has_stream_out) {
        velem[0].src_format = PIPE_FORMAT_R32_UINT;
        ctx->velem_state_readbuf = pipe->create_vertex_elements_state(pipe, 1, &velem[0]);
     }
  
     /* fragment shaders are created on-demand */
  
     /* vertex shaders */
     {
        const uint semantic_names[] = { TGSI_SEMANTIC_POSITION,
                                        TGSI_SEMANTIC_GENERIC };
        const uint semantic_indices[] = { 0, 0 };
        ctx->vs =
           util_make_vertex_passthrough_shader(pipe, 2, semantic_names,
                                               semantic_indices);
     }
     if (ctx->has_stream_out) {
        struct pipe_stream_output_info so;
        const uint semantic_names[] = { TGSI_SEMANTIC_POSITION };
        const uint semantic_indices[] = { 0 };
  
        memset(&so, 0, sizeof(so));
        so.num_outputs = 1;
        so.output[0].num_components = 1;
        so.stride[0] = 1;
  
        ctx->vs_pos_only =
           util_make_vertex_passthrough_shader_with_so(pipe, 1, semantic_names,
                                                       semantic_indices, &so);
     }
  
     /* set invariant vertex coordinates */
     for (i = 0; i < 4; i++)
        ctx->vertices[i][0][3] = 1; /*v.w*/
  
     ctx->upload = u_upload_create(pipe, 65536, 4, PIPE_BIND_VERTEX_BUFFER);
  
     return &ctx->base;
  }
  
  void util_blitter_destroy(struct blitter_context *blitter)
  {
     struct blitter_context_priv *ctx = (struct blitter_context_priv*)blitter;
     struct pipe_context *pipe = blitter->pipe;
     int i;
  
     pipe->delete_blend_state(pipe, ctx->blend_write_color);
     pipe->delete_blend_state(pipe, ctx->blend_keep_color);
     pipe->delete_depth_stencil_alpha_state(pipe, ctx->dsa_keep_depth_stencil);
     pipe->delete_depth_stencil_alpha_state(pipe,
                                            ctx->dsa_write_depth_keep_stencil);
     pipe->delete_depth_stencil_alpha_state(pipe, ctx->dsa_write_depth_stencil);
     pipe->delete_depth_stencil_alpha_state(pipe, ctx->dsa_keep_depth_write_stencil);
  
     pipe->delete_rasterizer_state(pipe, ctx->rs_state);
     if (ctx->rs_discard_state)
        pipe->delete_rasterizer_state(pipe, ctx->rs_discard_state);
     pipe->delete_vs_state(pipe, ctx->vs);
     if (ctx->vs_pos_only)
        pipe->delete_vs_state(pipe, ctx->vs_pos_only);
     pipe->delete_vertex_elements_state(pipe, ctx->velem_state);
     if (ctx->vertex_has_integers) {
        pipe->delete_vertex_elements_state(pipe, ctx->velem_sint_state);
        pipe->delete_vertex_elements_state(pipe, ctx->velem_uint_state);
     }
     if (ctx->velem_state_readbuf)
        pipe->delete_vertex_elements_state(pipe, ctx->velem_state_readbuf);
  
     for (i = 0; i < PIPE_MAX_TEXTURE_TYPES; i++) {
        if (ctx->fs_texfetch_col[i])
           pipe->delete_fs_state(pipe, ctx->fs_texfetch_col[i]);
        if (ctx->fs_texfetch_depth[i])
           pipe->delete_fs_state(pipe, ctx->fs_texfetch_depth[i]);
        if (ctx->fs_texfetch_depthstencil[i])
           pipe->delete_fs_state(pipe, ctx->fs_texfetch_depthstencil[i]);
        if (ctx->fs_texfetch_stencil[i])
           pipe->delete_fs_state(pipe, ctx->fs_texfetch_stencil[i]);
     }
  
     for (i = 0; i <= PIPE_MAX_COLOR_BUFS; i++) {
        if (ctx->fs_col[i])
           pipe->delete_fs_state(pipe, ctx->fs_col[i]);
        if (ctx->fs_col_int[i])
           pipe->delete_fs_state(pipe, ctx->fs_col_int[i]);
     }
  
     pipe->delete_sampler_state(pipe, ctx->sampler_state);
     u_upload_destroy(ctx->upload);
     FREE(ctx);
  }
  
  static void blitter_set_running_flag(struct blitter_context_priv *ctx)
  {
     if (ctx->base.running) {
        _debug_printf("u_blitter:%i: Caught recursion. This is a driver bug.\n",
                      __LINE__);
     }
     ctx->base.running = TRUE;
  }
  
  static void blitter_unset_running_flag(struct blitter_context_priv *ctx)
  {
     if (!ctx->base.running) {
        _debug_printf("u_blitter:%i: Caught recursion. This is a driver bug.\n",
                      __LINE__);
     }
     ctx->base.running = FALSE;
  }
  
  static void blitter_check_saved_vertex_states(struct blitter_context_priv *ctx)
  {
     assert(ctx->base.saved_num_vertex_buffers != ~0);
     assert(ctx->base.saved_velem_state != INVALID_PTR);
     assert(ctx->base.saved_vs != INVALID_PTR);
     assert(!ctx->has_geometry_shader || ctx->base.saved_gs != INVALID_PTR);
     assert(!ctx->has_stream_out || ctx->base.saved_num_so_targets != ~0);
     assert(ctx->base.saved_rs_state != INVALID_PTR);
  }
  
  static void blitter_restore_vertex_states(struct blitter_context_priv *ctx)
  {
     struct pipe_context *pipe = ctx->base.pipe;
     unsigned i;
  
     /* Vertex buffers. */
     pipe->set_vertex_buffers(pipe,
                              ctx->base.saved_num_vertex_buffers,
                              ctx->base.saved_vertex_buffers);
  
     for (i = 0; i < ctx->base.saved_num_vertex_buffers; i++) {
        if (ctx->base.saved_vertex_buffers[i].buffer) {
           pipe_resource_reference(&ctx->base.saved_vertex_buffers[i].buffer,
                                   NULL);
        }
     }
     ctx->base.saved_num_vertex_buffers = ~0;
  
     /* Vertex elements. */
     pipe->bind_vertex_elements_state(pipe, ctx->base.saved_velem_state);
     ctx->base.saved_velem_state = INVALID_PTR;
  
     /* Vertex shader. */
     pipe->bind_vs_state(pipe, ctx->base.saved_vs);
     ctx->base.saved_vs = INVALID_PTR;
  
     /* Geometry shader. */
     if (ctx->has_geometry_shader) {
        pipe->bind_gs_state(pipe, ctx->base.saved_gs);
        ctx->base.saved_gs = INVALID_PTR;
     }
  
     /* Stream outputs. */
     if (ctx->has_stream_out) {
        pipe->set_stream_output_targets(pipe,
                                        ctx->base.saved_num_so_targets,
                                        ctx->base.saved_so_targets, ~0);
  
        for (i = 0; i < ctx->base.saved_num_so_targets; i++)
           pipe_so_target_reference(&ctx->base.saved_so_targets[i], NULL);
  
        ctx->base.saved_num_so_targets = ~0;
     }
  
     /* Rasterizer. */
     pipe->bind_rasterizer_state(pipe, ctx->base.saved_rs_state);
     ctx->base.saved_rs_state = INVALID_PTR;
  }
  
  static void blitter_check_saved_fragment_states(struct blitter_context_priv *ctx)
  {
     assert(ctx->base.saved_fs != INVALID_PTR);
     assert(ctx->base.saved_dsa_state != INVALID_PTR);
     assert(ctx->base.saved_blend_state != INVALID_PTR);
  }
  
  static void blitter_restore_fragment_states(struct blitter_context_priv *ctx)
  {
     struct pipe_context *pipe = ctx->base.pipe;
  
     /* Fragment shader. */
     pipe->bind_fs_state(pipe, ctx->base.saved_fs);
     ctx->base.saved_fs = INVALID_PTR;
  
     /* Depth, stencil, alpha. */
     pipe->bind_depth_stencil_alpha_state(pipe, ctx->base.saved_dsa_state);
     ctx->base.saved_dsa_state = INVALID_PTR;
  
     /* Blend state. */
     pipe->bind_blend_state(pipe, ctx->base.saved_blend_state);
     ctx->base.saved_blend_state = INVALID_PTR;
  
     /* Sample mask. */
     if (ctx->base.is_sample_mask_saved) {
        pipe->set_sample_mask(pipe, ctx->base.saved_sample_mask);
        ctx->base.is_sample_mask_saved = FALSE;
     }
  
     /* Miscellaneous states. */
     /* XXX check whether these are saved and whether they need to be restored
      * (depending on the operation) */
     pipe->set_stencil_ref(pipe, &ctx->base.saved_stencil_ref);
     pipe->set_viewport_state(pipe, &ctx->base.saved_viewport);
  }
  
  static void blitter_check_saved_fb_state(struct blitter_context_priv *ctx)
  {
     assert(ctx->base.saved_fb_state.nr_cbufs != ~0);
  }
  
  static void blitter_restore_fb_state(struct blitter_context_priv *ctx)
  {
     struct pipe_context *pipe = ctx->base.pipe;
  
     pipe->set_framebuffer_state(pipe, &ctx->base.saved_fb_state);
     util_unreference_framebuffer_state(&ctx->base.saved_fb_state);
  }
  
  static void blitter_check_saved_textures(struct blitter_context_priv *ctx)
  {
     assert(ctx->base.saved_num_sampler_states != ~0);
     assert(ctx->base.saved_num_sampler_views != ~0);
  }
  
  static void blitter_restore_textures(struct blitter_context_priv *ctx)
  {
     struct pipe_context *pipe = ctx->base.pipe;
     unsigned i;
  
     /* Fragment sampler states. */
     pipe->bind_fragment_sampler_states(pipe,
                                        ctx->base.saved_num_sampler_states,
                                        ctx->base.saved_sampler_states);
     ctx->base.saved_num_sampler_states = ~0;
  
     /* Fragment sampler views. */
     pipe->set_fragment_sampler_views(pipe,
                                      ctx->base.saved_num_sampler_views,
                                      ctx->base.saved_sampler_views);
  
     for (i = 0; i < ctx->base.saved_num_sampler_views; i++)
        pipe_sampler_view_reference(&ctx->base.saved_sampler_views[i], NULL);
  
     ctx->base.saved_num_sampler_views = ~0;
  }
  
  static void blitter_set_rectangle(struct blitter_context_priv *ctx,
                                    unsigned x1, unsigned y1,
                                    unsigned x2, unsigned y2,
                                    float depth)
  {
     int i;
  
     /* set vertex positions */
     ctx->vertices[0][0][0] = (float)x1 / ctx->dst_width * 2.0f - 1.0f; /*v0.x*/
     ctx->vertices[0][0][1] = (float)y1 / ctx->dst_height * 2.0f - 1.0f; /*v0.y*/
  
     ctx->vertices[1][0][0] = (float)x2 / ctx->dst_width * 2.0f - 1.0f; /*v1.x*/
     ctx->vertices[1][0][1] = (float)y1 / ctx->dst_height * 2.0f - 1.0f; /*v1.y*/
  
     ctx->vertices[2][0][0] = (float)x2 / ctx->dst_width * 2.0f - 1.0f; /*v2.x*/
     ctx->vertices[2][0][1] = (float)y2 / ctx->dst_height * 2.0f - 1.0f; /*v2.y*/
  
     ctx->vertices[3][0][0] = (float)x1 / ctx->dst_width * 2.0f - 1.0f; /*v3.x*/
     ctx->vertices[3][0][1] = (float)y2 / ctx->dst_height * 2.0f - 1.0f; /*v3.y*/
  
     for (i = 0; i < 4; i++)
        ctx->vertices[i][0][2] = depth; /*z*/
  
     /* viewport */
     ctx->viewport.scale[0] = 0.5f * ctx->dst_width;
     ctx->viewport.scale[1] = 0.5f * ctx->dst_height;
     ctx->viewport.scale[2] = 1.0f;
     ctx->viewport.scale[3] = 1.0f;
     ctx->viewport.translate[0] = 0.5f * ctx->dst_width;
     ctx->viewport.translate[1] = 0.5f * ctx->dst_height;
     ctx->viewport.translate[2] = 0.0f;
     ctx->viewport.translate[3] = 0.0f;
     ctx->base.pipe->set_viewport_state(ctx->base.pipe, &ctx->viewport);
  }
  
  static void blitter_set_clear_color(struct blitter_context_priv *ctx,
                                      const union pipe_color_union *color)
  {
     int i;
  
     if (color) {
        for (i = 0; i < 4; i++) {
           uint32_t *uiverts = (uint32_t *)ctx->vertices[i][1];
           uiverts[0] = color->ui[0];
           uiverts[1] = color->ui[1];
           uiverts[2] = color->ui[2];
           uiverts[3] = color->ui[3];
        }
     } else {
        for (i = 0; i < 4; i++) {
           ctx->vertices[i][1][0] = 0;
           ctx->vertices[i][1][1] = 0;
           ctx->vertices[i][1][2] = 0;
           ctx->vertices[i][1][3] = 0;
        }
     }
  }
  
  static void get_texcoords(struct pipe_sampler_view *src,
                            unsigned src_width0, unsigned src_height0,
                            unsigned x1, unsigned y1,
                            unsigned x2, unsigned y2,
                            float out[4])
  {
     struct pipe_resource *tex = src->texture;
     unsigned level = src->u.tex.first_level;
     boolean normalized = tex->target != PIPE_TEXTURE_RECT &&
                          tex->nr_samples <= 1;
  
     if (normalized) {
        out[0] = x1 / (float)u_minify(src_width0,  level);
        out[1] = y1 / (float)u_minify(src_height0, level);
        out[2] = x2 / (float)u_minify(src_width0,  level);
        out[3] = y2 / (float)u_minify(src_height0, level);
     } else {
        out[0] = x1;
        out[1] = y1;
        out[2] = x2;
        out[3] = y2;
     }
  }
  
  static void set_texcoords_in_vertices(const float coord[4],
                                        float *out, unsigned stride)
  {
     out[0] = coord[0]; /*t0.s*/
     out[1] = coord[1]; /*t0.t*/
     out += stride;
     out[0] = coord[2]; /*t1.s*/
     out[1] = coord[1]; /*t1.t*/
     out += stride;
     out[0] = coord[2]; /*t2.s*/
     out[1] = coord[3]; /*t2.t*/
     out += stride;
     out[0] = coord[0]; /*t3.s*/
     out[1] = coord[3]; /*t3.t*/
  }
  
  static void blitter_set_texcoords(struct blitter_context_priv *ctx,
                                    struct pipe_sampler_view *src,
                                    unsigned src_width0, unsigned src_height0,
                                    unsigned layer, unsigned sample,
                                    unsigned x1, unsigned y1,
                                    unsigned x2, unsigned y2)
  {
     unsigned i;
     float coord[4];
     float face_coord[4][2];
  
     get_texcoords(src, src_width0, src_height0, x1, y1, x2, y2, coord);
  
     if (src->texture->target == PIPE_TEXTURE_CUBE) {
        set_texcoords_in_vertices(coord, &face_coord[0][0], 2);
        util_map_texcoords2d_onto_cubemap(layer,
                                          /* pointer, stride in floats */
                                          &face_coord[0][0], 2,
                                          &ctx->vertices[0][1][0], 8);
     } else {
        set_texcoords_in_vertices(coord, &ctx->vertices[0][1][0], 8);
     }
  
     /* Set the layer. */
     switch (src->texture->target) {
     case PIPE_TEXTURE_3D:
        {
           float r = layer / (float)u_minify(src->texture->depth0,
                                             src->u.tex.first_level);
           for (i = 0; i < 4; i++)
              ctx->vertices[i][1][2] = r; /*r*/
        }
        break;
  
     case PIPE_TEXTURE_1D_ARRAY:
        for (i = 0; i < 4; i++)
           ctx->vertices[i][1][1] = layer; /*t*/
        break;
  
     case PIPE_TEXTURE_2D_ARRAY:
        for (i = 0; i < 4; i++) {
           ctx->vertices[i][1][2] = layer;  /*r*/
           ctx->vertices[i][1][3] = sample; /*q*/
        }
        break;
  
     case PIPE_TEXTURE_2D:
        for (i = 0; i < 4; i++) {
           ctx->vertices[i][1][2] = sample; /*r*/
        }
        break;
  
     default:;
     }
  }
  
  static void blitter_set_dst_dimensions(struct blitter_context_priv *ctx,
                                         unsigned width, unsigned height)
  {
     ctx->dst_width = width;
     ctx->dst_height = height;
  }
  
  static INLINE
  void *blitter_get_fs_col(struct blitter_context_priv *ctx, unsigned num_cbufs,
                           boolean int_format)
  {
     struct pipe_context *pipe = ctx->base.pipe;
  
     assert(num_cbufs <= PIPE_MAX_COLOR_BUFS);
  
     if (int_format) {
        if (!ctx->fs_col_int[num_cbufs])
           ctx->fs_col_int[num_cbufs] =
              util_make_fragment_cloneinput_shader(pipe, num_cbufs,
                                                   TGSI_SEMANTIC_GENERIC,
                                                   TGSI_INTERPOLATE_CONSTANT);
        return ctx->fs_col_int[num_cbufs];
     } else {
        if (!ctx->fs_col[num_cbufs])
           ctx->fs_col[num_cbufs] =
              util_make_fragment_cloneinput_shader(pipe, num_cbufs,
                                                   TGSI_SEMANTIC_GENERIC,
                                                   TGSI_INTERPOLATE_LINEAR);
        return ctx->fs_col[num_cbufs];
     }
  }
  
  static INLINE
  void *blitter_get_fs_texfetch_col(struct blitter_context_priv *ctx,
                                    struct pipe_resource *tex)
  {
     struct pipe_context *pipe = ctx->base.pipe;
  
     assert(tex->target < PIPE_MAX_TEXTURE_TYPES);
  
     if (tex->nr_samples > 1) {
        void **shader = &ctx->fs_texfetch_col_msaa[tex->target];
  
        /* Create the fragment shader on-demand. */
        if (!*shader) {
           unsigned tgsi_tex = util_pipe_tex_to_tgsi_tex(tex->target,
                                                         tex->nr_samples);
  
           *shader = util_make_fs_blit_msaa_color(pipe, tgsi_tex);
        }
  
        return *shader;
     } else {
        void **shader = &ctx->fs_texfetch_col[tex->target];
  
        /* Create the fragment shader on-demand. */
        if (!*shader) {
           unsigned tgsi_tex = util_pipe_tex_to_tgsi_tex(tex->target, 0);
  
           *shader =
              util_make_fragment_tex_shader(pipe, tgsi_tex,
                                            TGSI_INTERPOLATE_LINEAR);
        }
  
        return *shader;
     }
  }
  
  static INLINE
  void *blitter_get_fs_texfetch_depth(struct blitter_context_priv *ctx,
                                      struct pipe_resource *tex)
  {
     struct pipe_context *pipe = ctx->base.pipe;
  
     assert(tex->target < PIPE_MAX_TEXTURE_TYPES);
  
     if (tex->nr_samples > 1) {
        void **shader = &ctx->fs_texfetch_depth_msaa[tex->target];
  
        /* Create the fragment shader on-demand. */
        if (!*shader) {
           unsigned tgsi_tex = util_pipe_tex_to_tgsi_tex(tex->target,
                                                         tex->nr_samples);
  
           *shader =
              util_make_fs_blit_msaa_depth(pipe, tgsi_tex);
        }
  
        return *shader;
     } else {
        void **shader = &ctx->fs_texfetch_depth[tex->target];
  
        /* Create the fragment shader on-demand. */
        if (!*shader) {
           unsigned tgsi_tex = util_pipe_tex_to_tgsi_tex(tex->target, 0);
  
           *shader =
              util_make_fragment_tex_shader_writedepth(pipe, tgsi_tex,
                                                       TGSI_INTERPOLATE_LINEAR);
        }
  
        return *shader;
     }
  }
  
  static INLINE
  void *blitter_get_fs_texfetch_depthstencil(struct blitter_context_priv *ctx,
                                             struct pipe_resource *tex)
  {
     struct pipe_context *pipe = ctx->base.pipe;
  
     assert(tex->target < PIPE_MAX_TEXTURE_TYPES);
  
     if (tex->nr_samples > 1) {
        void **shader = &ctx->fs_texfetch_depthstencil_msaa[tex->target];
  
        /* Create the fragment shader on-demand. */
        if (!*shader) {
           unsigned tgsi_tex = util_pipe_tex_to_tgsi_tex(tex->target,
                                                         tex->nr_samples);
  
           *shader =
              util_make_fs_blit_msaa_depthstencil(pipe, tgsi_tex);
        }
  
        return *shader;
     } else {
        void **shader = &ctx->fs_texfetch_depthstencil[tex->target];
  
        /* Create the fragment shader on-demand. */
        if (!*shader) {
           unsigned tgsi_tex = util_pipe_tex_to_tgsi_tex(tex->target, 0);
  
           *shader =
              util_make_fragment_tex_shader_writedepthstencil(pipe, tgsi_tex,
                                                       TGSI_INTERPOLATE_LINEAR);
        }
  
        return *shader;
     }
  }
  
  static INLINE
  void *blitter_get_fs_texfetch_stencil(struct blitter_context_priv *ctx,
                                        struct pipe_resource *tex)
  {
     struct pipe_context *pipe = ctx->base.pipe;
  
     assert(tex->target < PIPE_MAX_TEXTURE_TYPES);
  
     if (tex->nr_samples > 1) {
        void **shader = &ctx->fs_texfetch_stencil_msaa[tex->target];
  
        /* Create the fragment shader on-demand. */
        if (!*shader) {
           unsigned tgsi_tex = util_pipe_tex_to_tgsi_tex(tex->target,
                                                         tex->nr_samples);
  
           *shader =
              util_make_fs_blit_msaa_stencil(pipe, tgsi_tex);
        }
  
        return *shader;
     } else {
        void **shader = &ctx->fs_texfetch_stencil[tex->target];
  
        /* Create the fragment shader on-demand. */
        if (!*shader) {
           unsigned tgsi_tex = util_pipe_tex_to_tgsi_tex(tex->target, 0);
  
           *shader =
              util_make_fragment_tex_shader_writestencil(pipe, tgsi_tex,
                                                         TGSI_INTERPOLATE_LINEAR);
        }
  
        return *shader;
     }
  }
  
  static void blitter_set_common_draw_rect_state(struct blitter_context_priv *ctx)
  {
     struct pipe_context *pipe = ctx->base.pipe;
  
     pipe->bind_rasterizer_state(pipe, ctx->rs_state);
     pipe->bind_vs_state(pipe, ctx->vs);
     if (ctx->has_geometry_shader)
        pipe->bind_gs_state(pipe, NULL);
     if (ctx->has_stream_out)
        pipe->set_stream_output_targets(pipe, 0, NULL, 0);
  }
  
  static void blitter_draw(struct blitter_context_priv *ctx,
                           unsigned x1, unsigned y1,
                           unsigned x2, unsigned y2,
                           float depth)
  {
     struct pipe_resource *buf = NULL;
     unsigned offset = 0;
  
     blitter_set_rectangle(ctx, x1, y1, x2, y2, depth);
  
     u_upload_data(ctx->upload, 0, sizeof(ctx->vertices), ctx->vertices,
                   &offset, &buf);
     u_upload_unmap(ctx->upload);
     util_draw_vertex_buffer(ctx->base.pipe, NULL, buf, offset,
                             PIPE_PRIM_TRIANGLE_FAN, 4, 2);
     pipe_resource_reference(&buf, NULL);
  }
  
  void util_blitter_draw_rectangle(struct blitter_context *blitter,
                                   unsigned x1, unsigned y1,
                                   unsigned x2, unsigned y2,
                                   float depth,
                                   enum blitter_attrib_type type,
                                   const union pipe_color_union *attrib)
  {
     struct blitter_context_priv *ctx = (struct blitter_context_priv*)blitter;
  
     switch (type) {
        case UTIL_BLITTER_ATTRIB_COLOR:
           blitter_set_clear_color(ctx, attrib);
           break;
  
        case UTIL_BLITTER_ATTRIB_TEXCOORD:
           set_texcoords_in_vertices(attrib->f, &ctx->vertices[0][1][0], 8);
           break;
  
        default:;
     }
  
     blitter_draw(ctx, x1, y1, x2, y2, depth);
  }
  
  static void util_blitter_clear_custom(struct blitter_context *blitter,
                                        unsigned width, unsigned height,
                                        unsigned num_cbufs,
                                        unsigned clear_buffers,
                                        enum pipe_format cbuf_format,
                                        const union pipe_color_union *color,
                                        double depth, unsigned stencil,
                                        void *custom_blend, void *custom_dsa)
  {
     struct blitter_context_priv *ctx = (struct blitter_context_priv*)blitter;
     struct pipe_context *pipe = ctx->base.pipe;
     struct pipe_stencil_ref sr = { { 0 } };
     boolean int_format = util_format_is_pure_integer(cbuf_format);
     assert(num_cbufs <= PIPE_MAX_COLOR_BUFS);
  
     blitter_set_running_flag(ctx);
     blitter_check_saved_vertex_states(ctx);
     blitter_check_saved_fragment_states(ctx);
  
     /* bind states */
     if (custom_blend) {
        pipe->bind_blend_state(pipe, custom_blend);
     } else if (clear_buffers & PIPE_CLEAR_COLOR) {
        pipe->bind_blend_state(pipe, ctx->blend_write_color);
     } else {
        pipe->bind_blend_state(pipe, ctx->blend_keep_color);
     }
  
     if (custom_dsa) {
        pipe->bind_depth_stencil_alpha_state(pipe, custom_dsa);
     } else if ((clear_buffers & PIPE_CLEAR_DEPTHSTENCIL) == PIPE_CLEAR_DEPTHSTENCIL) {
        pipe->bind_depth_stencil_alpha_state(pipe, ctx->dsa_write_depth_stencil);
     } else if (clear_buffers & PIPE_CLEAR_DEPTH) {
        pipe->bind_depth_stencil_alpha_state(pipe, ctx->dsa_write_depth_keep_stencil);
     } else if (clear_buffers & PIPE_CLEAR_STENCIL) {
        pipe->bind_depth_stencil_alpha_state(pipe, ctx->dsa_keep_depth_write_stencil);
     } else {
        pipe->bind_depth_stencil_alpha_state(pipe, ctx->dsa_keep_depth_stencil);
     }
  
     sr.ref_value[0] = stencil & 0xff;
     pipe->set_stencil_ref(pipe, &sr);
  
     if (util_format_is_pure_sint(cbuf_format)) {
        pipe->bind_vertex_elements_state(pipe, ctx->velem_sint_state);
     } else if (util_format_is_pure_uint(cbuf_format)) {
        pipe->bind_vertex_elements_state(pipe, ctx->velem_uint_state);
     } else {
        pipe->bind_vertex_elements_state(pipe, ctx->velem_state);
     }
     pipe->bind_fs_state(pipe, blitter_get_fs_col(ctx, num_cbufs, int_format));
     pipe->set_sample_mask(pipe, ~0);
  
     blitter_set_common_draw_rect_state(ctx);
     blitter_set_dst_dimensions(ctx, width, height);
     blitter->draw_rectangle(blitter, 0, 0, width, height, depth,
                             UTIL_BLITTER_ATTRIB_COLOR, color);
  
     blitter_restore_vertex_states(ctx);
     blitter_restore_fragment_states(ctx);
     blitter_unset_running_flag(ctx);
  }
  
  void util_blitter_clear(struct blitter_context *blitter,
                          unsigned width, unsigned height,
                          unsigned num_cbufs,
                          unsigned clear_buffers,
                          enum pipe_format cbuf_format,
                          const union pipe_color_union *color,
                          double depth, unsigned stencil)
  {
     util_blitter_clear_custom(blitter, width, height, num_cbufs,
                               clear_buffers, cbuf_format, color, depth, stencil,
                               NULL, NULL);
  }
  
  void util_blitter_custom_clear_depth(struct blitter_context *blitter,
                                       unsigned width, unsigned height,
                                       double depth, void *custom_dsa)
  {
      static const union pipe_color_union color;
      util_blitter_clear_custom(blitter, width, height, 0,
                                0, PIPE_FORMAT_NONE, &color, depth, 0, NULL, custom_dsa);
  }
  
  static
  boolean is_overlap(unsigned dstx, unsigned dsty, unsigned dstz,
  		   const struct pipe_box *srcbox)
  {
     struct pipe_box src = *srcbox;
  
     if (src.width < 0) {
        src.x += src.width;
        src.width = -src.width;
     }
     if (src.height < 0) {
        src.y += src.height;
        src.height = -src.height;
     }
     if (src.depth < 0) {
        src.z += src.depth;
        src.depth = -src.depth;
     }
     return src.x < dstx+src.width && src.x+src.width > dstx &&
            src.y < dsty+src.height && src.y+src.height > dsty &&
            src.z < dstz+src.depth && src.z+src.depth > dstz;
  }
  
  void util_blitter_default_dst_texture(struct pipe_surface *dst_templ,
                                        struct pipe_resource *dst,
                                        unsigned dstlevel,
                                        unsigned dstz,
                                        const struct pipe_box *srcbox)
  {
      memset(dst_templ, 0, sizeof(*dst_templ));
      dst_templ->format = dst->format;
      if (util_format_is_depth_or_stencil(dst->format)) {
  	dst_templ->usage = PIPE_BIND_DEPTH_STENCIL;
      } else {
  	dst_templ->usage = PIPE_BIND_RENDER_TARGET;
      }
      dst_templ->format = util_format_linear(dst->format);
      dst_templ->u.tex.level = dstlevel;
      dst_templ->u.tex.first_layer = dstz;
      dst_templ->u.tex.last_layer = dstz + srcbox->depth - 1;
  }
  
  void util_blitter_default_src_texture(struct pipe_sampler_view *src_templ,
                                        struct pipe_resource *src,
                                        unsigned srclevel)
  {
      memset(src_templ, 0, sizeof(*src_templ));
      src_templ->format = util_format_linear(src->format);
      src_templ->u.tex.first_level = srclevel;
      src_templ->u.tex.last_level = srclevel;
      src_templ->u.tex.first_layer = 0;
      src_templ->u.tex.last_layer =
          src->target == PIPE_TEXTURE_3D ? u_minify(src->depth0, srclevel) - 1
                                         : src->array_size - 1;
      src_templ->swizzle_r = PIPE_SWIZZLE_RED;
      src_templ->swizzle_g = PIPE_SWIZZLE_GREEN;
      src_templ->swizzle_b = PIPE_SWIZZLE_BLUE;
      src_templ->swizzle_a = PIPE_SWIZZLE_ALPHA;
  }
  
  boolean util_blitter_is_copy_supported(struct blitter_context *blitter,
                                         const struct pipe_resource *dst,
                                         const struct pipe_resource *src,
                                         unsigned mask)
  {
     struct blitter_context_priv *ctx = (struct blitter_context_priv*)blitter;
     struct pipe_screen *screen = ctx->base.pipe->screen;
  
     if (dst) {
        unsigned bind;
        boolean is_stencil;
        const struct util_format_description *desc =
              util_format_description(dst->format);
  
        is_stencil = util_format_has_stencil(desc);
  
        /* Stencil export must be supported for stencil copy. */
        if ((mask & PIPE_MASK_S) && is_stencil && !ctx->has_stencil_export) {
           return FALSE;
        }
  
        if (is_stencil || util_format_has_depth(desc))
           bind = PIPE_BIND_DEPTH_STENCIL;
        else
           bind = PIPE_BIND_RENDER_TARGET;
  
        if (!screen->is_format_supported(screen, dst->format, dst->target,
                                         dst->nr_samples, bind)) {
           return FALSE;
        }
     }
  
     if (src) {
        if (!screen->is_format_supported(screen, src->format, src->target,
                                   src->nr_samples, PIPE_BIND_SAMPLER_VIEW)) {
           return FALSE;
        }
  
        /* Check stencil sampler support for stencil copy. */
        if (util_format_has_stencil(util_format_description(src->format))) {
           enum pipe_format stencil_format =
                 util_format_stencil_only(src->format);
           assert(stencil_format != PIPE_FORMAT_NONE);
  
           if (stencil_format != src->format &&
               !screen->is_format_supported(screen, stencil_format, src->target,
                                   src->nr_samples, PIPE_BIND_SAMPLER_VIEW)) {
              return FALSE;
           }
        }
     }
  
     return TRUE;
  }
  
  void util_blitter_copy_texture(struct blitter_context *blitter,
                                 struct pipe_resource *dst,
                                 unsigned dst_level, unsigned dst_sample_mask,
                                 unsigned dstx, unsigned dsty, unsigned dstz,
                                 struct pipe_resource *src,
                                 unsigned src_level, unsigned src_sample,
                                 const struct pipe_box *srcbox)
  {
     struct blitter_context_priv *ctx = (struct blitter_context_priv*)blitter;
     struct pipe_context *pipe = ctx->base.pipe;
     struct pipe_surface *dst_view, dst_templ;
     struct pipe_sampler_view src_templ, *src_view;
  
     assert(dst && src);
     assert(src->target < PIPE_MAX_TEXTURE_TYPES);
  
     /* Initialize the surface. */
     util_blitter_default_dst_texture(&dst_templ, dst, dst_level, dstz, srcbox);
     dst_view = pipe->create_surface(pipe, dst, &dst_templ);
  
     /* Initialize the sampler view. */
     util_blitter_default_src_texture(&src_templ, src, src_level);
     src_view = pipe->create_sampler_view(pipe, src, &src_templ);
  
     /* Copy. */
     util_blitter_copy_texture_view(blitter, dst_view, dst_sample_mask, dstx,
  				  dsty, src_view, src_sample, srcbox,
  				  src->width0, src->height0, PIPE_MASK_RGBAZS);
  
     pipe_surface_reference(&dst_view, NULL);
     pipe_sampler_view_reference(&src_view, NULL);
  }
  
  void util_blitter_copy_texture_view(struct blitter_context *blitter,
                                      struct pipe_surface *dst,
                                      unsigned dst_sample_mask,
                                      unsigned dstx, unsigned dsty,
                                      struct pipe_sampler_view *src,
                                      unsigned src_sample,
                                      const struct pipe_box *srcbox,
                                      unsigned src_width0, unsigned src_height0,
                                      unsigned mask)
  {
     struct blitter_context_priv *ctx = (struct blitter_context_priv*)blitter;
     struct pipe_context *pipe = ctx->base.pipe;
     struct pipe_framebuffer_state fb_state;
     enum pipe_texture_target src_target = src->texture->target;
     int abs_width = abs(srcbox->width);
     int abs_height = abs(srcbox->height);
     boolean blit_stencil, blit_depth;
     const struct util_format_description *src_desc =
           util_format_description(src->format);
  
     blit_depth = util_format_has_depth(src_desc) && (mask & PIPE_MASK_Z);
     blit_stencil = util_format_has_stencil(src_desc) && (mask & PIPE_MASK_S);
  
     /* If you want a fallback for stencil copies,
      * use util_blitter_copy_texture. */
     if (blit_stencil && !ctx->has_stencil_export) {
        blit_stencil = FALSE;
  
        if (!blit_depth)
           return;
     }
  
     /* Sanity checks. */
     if (dst->texture == src->texture &&
         dst->u.tex.level == src->u.tex.first_level) {
        assert(!is_overlap(dstx, dsty, 0, srcbox));
     }
     /* XXX should handle 3d regions */
     assert(srcbox->depth == 1);
  
     /* Check whether the states are properly saved. */
     blitter_set_running_flag(ctx);
     blitter_check_saved_vertex_states(ctx);
     blitter_check_saved_fragment_states(ctx);
     blitter_check_saved_textures(ctx);
     blitter_check_saved_fb_state(ctx);
  
     /* Initialize framebuffer state. */
     fb_state.width = dst->width;
     fb_state.height = dst->height;
  
     if (blit_depth || blit_stencil) {
        pipe->bind_blend_state(pipe, ctx->blend_keep_color);
  
        if (blit_depth && blit_stencil) {
           pipe->bind_depth_stencil_alpha_state(pipe,
                                                ctx->dsa_write_depth_stencil);
           pipe->bind_fs_state(pipe,
                 blitter_get_fs_texfetch_depthstencil(ctx, src->texture));
        } else if (blit_depth) {
           pipe->bind_depth_stencil_alpha_state(pipe,
                                                ctx->dsa_write_depth_keep_stencil);
           pipe->bind_fs_state(pipe,
                 blitter_get_fs_texfetch_depth(ctx, src->texture));
        } else { /* is_stencil */
           pipe->bind_depth_stencil_alpha_state(pipe,
                                                ctx->dsa_keep_depth_write_stencil);
           pipe->bind_fs_state(pipe,
                 blitter_get_fs_texfetch_stencil(ctx, src->texture));
        }
  
        fb_state.nr_cbufs = 0;
        fb_state.zsbuf = dst;
     } else {
        pipe->bind_blend_state(pipe, ctx->blend_write_color);
        pipe->bind_depth_stencil_alpha_state(pipe, ctx->dsa_keep_depth_stencil);
        pipe->bind_fs_state(pipe,
              blitter_get_fs_texfetch_col(ctx, src->texture));
  
        fb_state.nr_cbufs = 1;
        fb_state.cbufs[0] = dst;
        fb_state.zsbuf = 0;
     }
  
     if (blit_depth && blit_stencil) {
        /* Setup two samplers, one for depth and the other one for stencil. */
        struct pipe_sampler_view templ;
        struct pipe_sampler_view *views[2];
        void *samplers[2] = {ctx->sampler_state, ctx->sampler_state};
  
        templ = *src;
        templ.format = util_format_stencil_only(templ.format);
        assert(templ.format != PIPE_FORMAT_NONE);
  
        views[0] = src;
        views[1] = pipe->create_sampler_view(pipe, src->texture, &templ);
  
        pipe->set_fragment_sampler_views(pipe, 2, views);
        pipe->bind_fragment_sampler_states(pipe, 2, samplers);
  
        pipe_sampler_view_reference(&views[1], NULL);
     } else if (blit_stencil) {
        /* Set a stencil-only sampler view for it not to sample depth instead. */
        struct pipe_sampler_view templ;
        struct pipe_sampler_view *view;
  
        templ = *src;
        templ.format = util_format_stencil_only(templ.format);
        assert(templ.format != PIPE_FORMAT_NONE);
  
        view = pipe->create_sampler_view(pipe, src->texture, &templ);
  
        pipe->set_fragment_sampler_views(pipe, 1, &view);
        pipe->bind_fragment_sampler_states(pipe, 1, &ctx->sampler_state);
  
        pipe_sampler_view_reference(&view, NULL);
     } else {
        pipe->set_fragment_sampler_views(pipe, 1, &src);
        pipe->bind_fragment_sampler_states(pipe, 1, &ctx->sampler_state);
     }
  
     pipe->bind_vertex_elements_state(pipe, ctx->velem_state);
     pipe->set_framebuffer_state(pipe, &fb_state);
     pipe->set_sample_mask(pipe, dst_sample_mask);
  
     blitter_set_common_draw_rect_state(ctx);
     blitter_set_dst_dimensions(ctx, dst->width, dst->height);
  
     if ((src_target == PIPE_TEXTURE_1D ||
          src_target == PIPE_TEXTURE_2D ||
          src_target == PIPE_TEXTURE_RECT) &&
         src->texture->nr_samples <= 1) {
        /* Draw the quad with the draw_rectangle callback. */
  
        /* Set texture coordinates. - use a pipe color union
         * for interface purposes.
         * XXX pipe_color_union is a wrong name since we use that to set
         * texture coordinates too.
         */
        union pipe_color_union coord;
        get_texcoords(src, src_width0, src_height0, srcbox->x, srcbox->y,
                      srcbox->x+srcbox->width, srcbox->y+srcbox->height, coord.f);
  
        /* Draw. */
        blitter->draw_rectangle(blitter, dstx, dsty, dstx+abs_width, dsty+abs_height, 0,
                                UTIL_BLITTER_ATTRIB_TEXCOORD, &coord);
     } else {
        /* Draw the quad with the generic codepath. */
        blitter_set_texcoords(ctx, src, src_width0, src_height0, srcbox->z,
                              src_sample,
                              srcbox->x, srcbox->y,
                              srcbox->x + srcbox->width, srcbox->y + srcbox->height);
        blitter_draw(ctx, dstx, dsty, dstx+abs_width, dsty+abs_height, 0);
     }
  
     blitter_restore_vertex_states(ctx);
     blitter_restore_fragment_states(ctx);
     blitter_restore_textures(ctx);
     blitter_restore_fb_state(ctx);
     blitter_unset_running_flag(ctx);
  }
  
  /* Clear a region of a color surface to a constant value. */
  void util_blitter_clear_render_target(struct blitter_context *blitter,
                                        struct pipe_surface *dstsurf,
                                        const union pipe_color_union *color,
                                        unsigned dstx, unsigned dsty,
                                        unsigned width, unsigned height)
  {
     struct blitter_context_priv *ctx = (struct blitter_context_priv*)blitter;
     struct pipe_context *pipe = ctx->base.pipe;
     struct pipe_framebuffer_state fb_state;
  
     assert(dstsurf->texture);
     if (!dstsurf->texture)
        return;
  
     /* check the saved state */
     blitter_set_running_flag(ctx);
     blitter_check_saved_vertex_states(ctx);
     blitter_check_saved_fragment_states(ctx);
     blitter_check_saved_fb_state(ctx);
  
     /* bind states */
     pipe->bind_blend_state(pipe, ctx->blend_write_color);
     pipe->bind_depth_stencil_alpha_state(pipe, ctx->dsa_keep_depth_stencil);
     pipe->bind_fs_state(pipe, blitter_get_fs_col(ctx, 1, FALSE));
     pipe->bind_vertex_elements_state(pipe, ctx->velem_state);
  
     /* set a framebuffer state */
     fb_state.width = dstsurf->width;
     fb_state.height = dstsurf->height;
     fb_state.nr_cbufs = 1;
     fb_state.cbufs[0] = dstsurf;
     fb_state.zsbuf = 0;
     pipe->set_framebuffer_state(pipe, &fb_state);
     pipe->set_sample_mask(pipe, ~0);
  
     blitter_set_common_draw_rect_state(ctx);
     blitter_set_dst_dimensions(ctx, dstsurf->width, dstsurf->height);
     blitter->draw_rectangle(blitter, dstx, dsty, dstx+width, dsty+height, 0,
                             UTIL_BLITTER_ATTRIB_COLOR, color);
  
     blitter_restore_vertex_states(ctx);
     blitter_restore_fragment_states(ctx);
     blitter_restore_fb_state(ctx);
     blitter_unset_running_flag(ctx);
  }
  
  /* Clear a region of a depth stencil surface. */
  void util_blitter_clear_depth_stencil(struct blitter_context *blitter,
                                        struct pipe_surface *dstsurf,
                                        unsigned clear_flags,
                                        double depth,
                                        unsigned stencil,
                                        unsigned dstx, unsigned dsty,
                                        unsigned width, unsigned height)
  {
     struct blitter_context_priv *ctx = (struct blitter_context_priv*)blitter;
     struct pipe_context *pipe = ctx->base.pipe;
     struct pipe_framebuffer_state fb_state;
     struct pipe_stencil_ref sr = { { 0 } };
  
     assert(dstsurf->texture);
     if (!dstsurf->texture)
        return;
  
     /* check the saved state */
     blitter_set_running_flag(ctx);
     blitter_check_saved_vertex_states(ctx);
     blitter_check_saved_fragment_states(ctx);
     blitter_check_saved_fb_state(ctx);
  
     /* bind states */
     pipe->bind_blend_state(pipe, ctx->blend_keep_color);
     if ((clear_flags & PIPE_CLEAR_DEPTHSTENCIL) == PIPE_CLEAR_DEPTHSTENCIL) {
        sr.ref_value[0] = stencil & 0xff;
        pipe->bind_depth_stencil_alpha_state(pipe, ctx->dsa_write_depth_stencil);
        pipe->set_stencil_ref(pipe, &sr);
     }
     else if (clear_flags & PIPE_CLEAR_DEPTH) {
        pipe->bind_depth_stencil_alpha_state(pipe, ctx->dsa_write_depth_keep_stencil);
     }
     else if (clear_flags & PIPE_CLEAR_STENCIL) {
        sr.ref_value[0] = stencil & 0xff;
        pipe->bind_depth_stencil_alpha_state(pipe, ctx->dsa_keep_depth_write_stencil);
        pipe->set_stencil_ref(pipe, &sr);
     }
     else
        /* hmm that should be illegal probably, or make it a no-op somewhere */
        pipe->bind_depth_stencil_alpha_state(pipe, ctx->dsa_keep_depth_stencil);
  
     pipe->bind_fs_state(pipe, blitter_get_fs_col(ctx, 0, FALSE));
     pipe->bind_vertex_elements_state(pipe, ctx->velem_state);
  
     /* set a framebuffer state */
     fb_state.width = dstsurf->width;
     fb_state.height = dstsurf->height;
     fb_state.nr_cbufs = 0;
     fb_state.cbufs[0] = 0;
     fb_state.zsbuf = dstsurf;
     pipe->set_framebuffer_state(pipe, &fb_state);
     pipe->set_sample_mask(pipe, ~0);
  
     blitter_set_common_draw_rect_state(ctx);
     blitter_set_dst_dimensions(ctx, dstsurf->width, dstsurf->height);
     blitter->draw_rectangle(blitter, dstx, dsty, dstx+width, dsty+height, depth,
                             UTIL_BLITTER_ATTRIB_NONE, NULL);
  
     blitter_restore_vertex_states(ctx);
     blitter_restore_fragment_states(ctx);
     blitter_restore_fb_state(ctx);
     blitter_unset_running_flag(ctx);
  }
  
  /* draw a rectangle across a region using a custom dsa stage - for r600g */
  void util_blitter_custom_depth_stencil(struct blitter_context *blitter,
  				       struct pipe_surface *zsurf,
  				       struct pipe_surface *cbsurf,
  				       unsigned sample_mask,
  				       void *dsa_stage, float depth)
  {
     struct blitter_context_priv *ctx = (struct blitter_context_priv*)blitter;
     struct pipe_context *pipe = ctx->base.pipe;
     struct pipe_framebuffer_state fb_state;
  
     assert(zsurf->texture);
     if (!zsurf->texture)
        return;
  
     /* check the saved state */
     blitter_set_running_flag(ctx);
     blitter_check_saved_vertex_states(ctx);
     blitter_check_saved_fragment_states(ctx);
     blitter_check_saved_fb_state(ctx);
  
     /* bind states */
     pipe->bind_blend_state(pipe, ctx->blend_write_color);
     pipe->bind_depth_stencil_alpha_state(pipe, dsa_stage);
     pipe->bind_fs_state(pipe, blitter_get_fs_col(ctx, 0, FALSE));
     pipe->bind_vertex_elements_state(pipe, ctx->velem_state);
  
     /* set a framebuffer state */
     fb_state.width = zsurf->width;
     fb_state.height = zsurf->height;
     fb_state.nr_cbufs = 1;
     if (cbsurf) {
  	   fb_state.cbufs[0] = cbsurf;
  	   fb_state.nr_cbufs = 1;
     } else {
  	   fb_state.cbufs[0] = NULL;
  	   fb_state.nr_cbufs = 0;
     }
     fb_state.zsbuf = zsurf;
     pipe->set_framebuffer_state(pipe, &fb_state);
     pipe->set_sample_mask(pipe, sample_mask);
  
     blitter_set_common_draw_rect_state(ctx);
     blitter_set_dst_dimensions(ctx, zsurf->width, zsurf->height);
     blitter->draw_rectangle(blitter, 0, 0, zsurf->width, zsurf->height, depth,
                             UTIL_BLITTER_ATTRIB_NONE, NULL);
  
     blitter_restore_vertex_states(ctx);
     blitter_restore_fragment_states(ctx);
     blitter_restore_fb_state(ctx);
     blitter_unset_running_flag(ctx);
  }
  
  void util_blitter_copy_buffer(struct blitter_context *blitter,
                                struct pipe_resource *dst,
                                unsigned dstx,
                                struct pipe_resource *src,
                                unsigned srcx,
                                unsigned size)
  {
     struct blitter_context_priv *ctx = (struct blitter_context_priv*)blitter;
     struct pipe_context *pipe = ctx->base.pipe;
     struct pipe_vertex_buffer vb;
     struct pipe_stream_output_target *so_target;
  
     if (srcx >= src->width0 ||
         dstx >= dst->width0) {
        return;
     }
     if (srcx + size > src->width0) {
        size = src->width0 - srcx;
     }
     if (dstx + size > dst->width0) {
        size = dst->width0 - dstx;
     }
  
     /* Drivers not capable of Stream Out should not call this function
      * in the first place. */
     assert(ctx->has_stream_out);
  
     /* Some alignment is required. */
     if (srcx % 4 != 0 || dstx % 4 != 0 || size % 4 != 0 ||
         !ctx->has_stream_out) {
        struct pipe_box box;
        u_box_1d(srcx, size, &box);
        util_resource_copy_region(pipe, dst, 0, dstx, 0, 0, src, 0, &box);
        return;
     }
  
     blitter_set_running_flag(ctx);
     blitter_check_saved_vertex_states(ctx);
  
     vb.buffer = src;
     vb.buffer_offset = srcx;
     vb.stride = 4;
  
     pipe->set_vertex_buffers(pipe, 1, &vb);
     pipe->bind_vertex_elements_state(pipe, ctx->velem_state_readbuf);
     pipe->bind_vs_state(pipe, ctx->vs_pos_only);
     if (ctx->has_geometry_shader)
        pipe->bind_gs_state(pipe, NULL);
     pipe->bind_rasterizer_state(pipe, ctx->rs_discard_state);
  
     so_target = pipe->create_stream_output_target(pipe, dst, dstx, size);
     pipe->set_stream_output_targets(pipe, 1, &so_target, 0);
  
     util_draw_arrays(pipe, PIPE_PRIM_POINTS, 0, size / 4);
  
     blitter_restore_vertex_states(ctx);
     blitter_unset_running_flag(ctx);
     pipe_so_target_reference(&so_target, NULL);
  }
  
  /* probably radeon specific */
  void util_blitter_custom_resolve_color(struct blitter_context *blitter,
  				       struct pipe_resource *dst,
  				       unsigned dst_level,
  				       unsigned dst_layer,
  				       struct pipe_resource *src,
  				       unsigned src_layer,
  				       unsigned sample_mask,
  				       void *custom_blend)
  {
     struct blitter_context_priv *ctx = (struct blitter_context_priv*)blitter;
     struct pipe_context *pipe = ctx->base.pipe;
     struct pipe_framebuffer_state fb_state;
     struct pipe_surface *srcsurf, *dstsurf, surf_tmpl;
  
     blitter_set_running_flag(ctx);
     blitter_check_saved_vertex_states(ctx);
     blitter_check_saved_fragment_states(ctx);
  
     /* bind states */
     pipe->bind_blend_state(pipe, custom_blend);
     pipe->bind_depth_stencil_alpha_state(pipe, ctx->dsa_keep_depth_stencil);
     pipe->bind_vertex_elements_state(pipe, ctx->velem_state);
     pipe->bind_fs_state(pipe, blitter_get_fs_col(ctx, 1, FALSE));
     pipe->set_sample_mask(pipe, sample_mask);
  
     memset(&surf_tmpl, 0, sizeof(surf_tmpl));
     surf_tmpl.format = dst->format;
     surf_tmpl.u.tex.level = dst_level;
     surf_tmpl.u.tex.first_layer = dst_layer;
     surf_tmpl.u.tex.last_layer = dst_layer;
     surf_tmpl.usage = PIPE_BIND_RENDER_TARGET;
  
     dstsurf = pipe->create_surface(pipe, dst, &surf_tmpl);
  
     surf_tmpl.u.tex.level = 0;
     surf_tmpl.u.tex.first_layer = src_layer;
     surf_tmpl.u.tex.last_layer = src_layer;
  
     srcsurf = pipe->create_surface(pipe, src, &surf_tmpl);
  
     /* set a framebuffer state */
     fb_state.width = src->width0;
     fb_state.height = src->height0;
     fb_state.nr_cbufs = 2;
     fb_state.cbufs[0] = srcsurf;
     fb_state.cbufs[1] = dstsurf;
     fb_state.zsbuf = NULL;
     pipe->set_framebuffer_state(pipe, &fb_state);
  
     blitter_set_common_draw_rect_state(ctx);
     blitter_set_dst_dimensions(ctx, src->width0, src->height0);
     blitter->draw_rectangle(blitter, 0, 0, src->width0, src->height0,
                             0, 0, NULL);
     blitter_restore_fb_state(ctx);
     blitter_restore_vertex_states(ctx);
     blitter_restore_fragment_states(ctx);
     blitter_unset_running_flag(ctx);
  
     pipe_surface_reference(&srcsurf, NULL);
     pipe_surface_reference(&dstsurf, NULL);
  }
  
  void util_blitter_custom_color(struct blitter_context *blitter,
                                 struct pipe_surface *dstsurf,
                                 void *custom_blend)
  {
     struct blitter_context_priv *ctx = (struct blitter_context_priv*)blitter;
     struct pipe_context *pipe = ctx->base.pipe;
     struct pipe_framebuffer_state fb_state;
  
     assert(dstsurf->texture);
     if (!dstsurf->texture)
        return;
  
     /* check the saved state */
     blitter_set_running_flag(ctx);
     blitter_check_saved_vertex_states(ctx);
     blitter_check_saved_fragment_states(ctx);
     blitter_check_saved_fb_state(ctx);
  
     /* bind states */
     pipe->bind_blend_state(pipe, custom_blend);
     pipe->bind_depth_stencil_alpha_state(pipe, ctx->dsa_keep_depth_stencil);
     pipe->bind_fs_state(pipe, blitter_get_fs_col(ctx, 1, FALSE));
     pipe->bind_vertex_elements_state(pipe, ctx->velem_state);
     pipe->set_sample_mask(pipe, (1ull << MAX2(1, dstsurf->texture->nr_samples)) - 1);
  
     /* set a framebuffer state */
     fb_state.width = dstsurf->width;
     fb_state.height = dstsurf->height;
     fb_state.nr_cbufs = 1;
     fb_state.cbufs[0] = dstsurf;
     fb_state.zsbuf = 0;
     pipe->set_framebuffer_state(pipe, &fb_state);
     pipe->set_sample_mask(pipe, ~0);
  
     blitter_set_common_draw_rect_state(ctx);
     blitter_set_dst_dimensions(ctx, dstsurf->width, dstsurf->height);
     blitter->draw_rectangle(blitter, 0, 0, dstsurf->width, dstsurf->height,
                             0, 0, NULL);
  
     blitter_restore_vertex_states(ctx);
     blitter_restore_fragment_states(ctx);
     blitter_restore_fb_state(ctx);
     blitter_unset_running_flag(ctx);
  }
  