text: /*
   * Copyright 2003 VMware, Inc.
   * All Rights Reserved.
   *
   * 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, sublicense, 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 NONINFRINGEMENT.
   * IN NO EVENT SHALL VMWARE 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.
   */
  
  #include "main/version.h"
  
  #include "brw_context.h"
  #include "brw_defines.h"
  #include "intel_batchbuffer.h"
  
  /**
   * Test if we can use MI_LOAD_REGISTER_MEM from an untrusted batchbuffer.
   *
   * Some combinations of hardware and kernel versions allow this feature,
   * while others don't.  Instead of trying to enumerate every case, just
   * try and write a register and see if works.
   */
  static bool
  can_do_pipelined_register_writes(struct brw_context *brw)
  {
     /**
      * gen >= 8 specifically allows these writes. gen <= 6 also
      * doesn't block them.
      */
     if (brw->gen != 7)
        return true;
  
     static int result = -1;
     if (result != -1)
        return result;
  
     /* We use SO_WRITE_OFFSET0 since you're supposed to write it (unlike the
      * statistics registers), and we already reset it to zero before using it.
      */
     const int reg = GEN7_SO_WRITE_OFFSET(0);
     const int expected_value = 0x1337d0d0;
     const int offset = 100;
  
     /* The register we picked only exists on Gen7+. */
     assert(brw->gen == 7);
  
     uint32_t *data;
     /* Set a value in a BO to a known quantity.  The workaround BO already
      * exists and doesn't contain anything important, so we may as well use it.
      */
     drm_intel_bo_map(brw->workaround_bo, true);
     data = brw->workaround_bo->virtual;
     data[offset] = 0xffffffff;
     drm_intel_bo_unmap(brw->workaround_bo);
  
     /* Write the register. */
     BEGIN_BATCH(3);
     OUT_BATCH(MI_LOAD_REGISTER_IMM | (3 - 2));
     OUT_BATCH(reg);
     OUT_BATCH(expected_value);
     ADVANCE_BATCH();
  
     brw_emit_mi_flush(brw);
  
     /* Save the register's value back to the buffer. */
     BEGIN_BATCH(3);
     OUT_BATCH(MI_STORE_REGISTER_MEM | (3 - 2));
     OUT_BATCH(reg);
     OUT_RELOC(brw->workaround_bo,
               I915_GEM_DOMAIN_INSTRUCTION, I915_GEM_DOMAIN_INSTRUCTION,
               offset * sizeof(uint32_t));
     ADVANCE_BATCH();
  
     intel_batchbuffer_flush(brw);
  
     /* Check whether the value got written. */
     drm_intel_bo_map(brw->workaround_bo, false);
     data = brw->workaround_bo->virtual;
     bool success = data[offset] == expected_value;
     drm_intel_bo_unmap(brw->workaround_bo);
  
     result = success;
  
     return success;
  }
  
  static bool
  can_write_oacontrol(struct brw_context *brw)
  {
     if (brw->gen < 6 || brw->gen >= 8)
        return false;
  
     static int result = -1;
     if (result != -1)
        return result;
  
     /* Set "Select Context ID" to a particular address (which is likely not a
      * context), but leave all counting disabled.  This should be harmless.
      */
     const int expected_value = 0x31337000;
     const int offset = 110;
  
     uint32_t *data;
     /* Set a value in a BO to a known quantity.  The workaround BO already
      * exists and doesn't contain anything important, so we may as well use it.
      */
     drm_intel_bo_map(brw->workaround_bo, true);
     data = brw->workaround_bo->virtual;
     data[offset] = 0xffffffff;
     drm_intel_bo_unmap(brw->workaround_bo);
  
     /* Write OACONTROL. */
     BEGIN_BATCH(3);
     OUT_BATCH(MI_LOAD_REGISTER_IMM | (3 - 2));
     OUT_BATCH(OACONTROL);
     OUT_BATCH(expected_value);
     ADVANCE_BATCH();
  
     brw_emit_mi_flush(brw);
  
     /* Save the register's value back to the buffer. */
     BEGIN_BATCH(3);
     OUT_BATCH(MI_STORE_REGISTER_MEM | (3 - 2));
     OUT_BATCH(OACONTROL);
     OUT_RELOC(brw->workaround_bo,
               I915_GEM_DOMAIN_INSTRUCTION, I915_GEM_DOMAIN_INSTRUCTION,
               offset * sizeof(uint32_t));
     ADVANCE_BATCH();
  
     brw_emit_mi_flush(brw);
  
     /* Set OACONTROL back to zero (everything off). */
     BEGIN_BATCH(3);
     OUT_BATCH(MI_LOAD_REGISTER_IMM | (3 - 2));
     OUT_BATCH(OACONTROL);
     OUT_BATCH(0);
     ADVANCE_BATCH();
  
     intel_batchbuffer_flush(brw);
  
     /* Check whether the value got written. */
     drm_intel_bo_map(brw->workaround_bo, false);
     data = brw->workaround_bo->virtual;
     bool success = data[offset] == expected_value;
     drm_intel_bo_unmap(brw->workaround_bo);
  
     result = success;
  
     return success;
  }
  
  /**
   * Initializes potential list of extensions if ctx == NULL, or actually enables
   * extensions for a context.
   */
  void
  intelInitExtensions(struct gl_context *ctx)
  {
     struct brw_context *brw = brw_context(ctx);
  
     assert(brw->gen >= 4);
  
     ctx->Extensions.ARB_arrays_of_arrays = true;
     ctx->Extensions.ARB_buffer_storage = true;
     ctx->Extensions.ARB_clear_texture = true;
     ctx->Extensions.ARB_clip_control = true;
     ctx->Extensions.ARB_copy_image = true;
     ctx->Extensions.ARB_depth_buffer_float = true;
     ctx->Extensions.ARB_depth_clamp = true;
     ctx->Extensions.ARB_depth_texture = true;
     ctx->Extensions.ARB_draw_elements_base_vertex = true;
     ctx->Extensions.ARB_draw_instanced = true;
     ctx->Extensions.ARB_ES2_compatibility = true;
     ctx->Extensions.ARB_explicit_attrib_location = true;
     ctx->Extensions.ARB_explicit_uniform_location = true;
     ctx->Extensions.ARB_fragment_coord_conventions = true;
     ctx->Extensions.ARB_fragment_program = true;
     ctx->Extensions.ARB_fragment_program_shadow = true;
     ctx->Extensions.ARB_fragment_shader = true;
     ctx->Extensions.ARB_framebuffer_object = true;
     ctx->Extensions.ARB_half_float_vertex = true;
     ctx->Extensions.ARB_instanced_arrays = true;
     ctx->Extensions.ARB_internalformat_query = true;
     ctx->Extensions.ARB_internalformat_query2 = true;
     ctx->Extensions.ARB_map_buffer_range = true;
     ctx->Extensions.ARB_occlusion_query = true;
     ctx->Extensions.ARB_occlusion_query2 = true;
     ctx->Extensions.ARB_pipeline_statistics_query = true;
     ctx->Extensions.ARB_point_sprite = true;
     ctx->Extensions.ARB_seamless_cube_map = true;
     ctx->Extensions.ARB_shader_bit_encoding = true;
     ctx->Extensions.ARB_shader_draw_parameters = true;
     ctx->Extensions.ARB_shader_texture_lod = true;
     ctx->Extensions.ARB_shading_language_packing = true;
     ctx->Extensions.ARB_shadow = true;
     ctx->Extensions.ARB_sync = true;
     ctx->Extensions.ARB_texture_border_clamp = true;
     ctx->Extensions.ARB_texture_compression_rgtc = true;
     ctx->Extensions.ARB_texture_cube_map = true;
     ctx->Extensions.ARB_texture_env_combine = true;
     ctx->Extensions.ARB_texture_env_crossbar = true;
     ctx->Extensions.ARB_texture_env_dot3 = true;
     ctx->Extensions.ARB_texture_float = true;
     ctx->Extensions.ARB_texture_mirror_clamp_to_edge = true;
     ctx->Extensions.ARB_texture_non_power_of_two = true;
     ctx->Extensions.ARB_texture_rg = true;
     ctx->Extensions.ARB_texture_rgb10_a2ui = true;
     ctx->Extensions.ARB_vertex_program = true;
     ctx->Extensions.ARB_vertex_shader = true;
     ctx->Extensions.ARB_vertex_type_2_10_10_10_rev = true;
     ctx->Extensions.ARB_vertex_type_10f_11f_11f_rev = true;
     ctx->Extensions.EXT_blend_color = true;
     ctx->Extensions.EXT_blend_equation_separate = true;
     ctx->Extensions.EXT_blend_func_separate = true;
     ctx->Extensions.EXT_blend_minmax = true;
     ctx->Extensions.EXT_draw_buffers2 = true;
     ctx->Extensions.EXT_framebuffer_sRGB = true;
     ctx->Extensions.EXT_gpu_program_parameters = true;
     ctx->Extensions.EXT_packed_float = true;
     ctx->Extensions.EXT_pixel_buffer_object = true;
     ctx->Extensions.EXT_point_parameters = true;
     ctx->Extensions.EXT_polygon_offset_clamp = true;
     ctx->Extensions.EXT_provoking_vertex = true;
     ctx->Extensions.EXT_stencil_two_side = true;
     ctx->Extensions.EXT_texture_array = true;
     ctx->Extensions.EXT_texture_env_dot3 = true;
     ctx->Extensions.EXT_texture_filter_anisotropic = true;
     ctx->Extensions.EXT_texture_integer = true;
     ctx->Extensions.EXT_texture_shared_exponent = true;
     ctx->Extensions.EXT_texture_snorm = true;
     ctx->Extensions.EXT_texture_sRGB = true;
     ctx->Extensions.EXT_texture_sRGB_decode = true;
     ctx->Extensions.EXT_texture_swizzle = true;
     ctx->Extensions.EXT_vertex_array_bgra = true;
     ctx->Extensions.KHR_robustness = true;
     ctx->Extensions.AMD_seamless_cubemap_per_texture = true;
     ctx->Extensions.APPLE_object_purgeable = true;
     ctx->Extensions.ATI_separate_stencil = true;
     ctx->Extensions.ATI_texture_env_combine3 = true;
     ctx->Extensions.MESA_pack_invert = true;
     ctx->Extensions.NV_conditional_render = true;
     ctx->Extensions.NV_primitive_restart = true;
     ctx->Extensions.NV_texture_barrier = true;
     ctx->Extensions.NV_texture_env_combine4 = true;
     ctx->Extensions.NV_texture_rectangle = true;
     ctx->Extensions.TDFX_texture_compression_FXT1 = true;
     ctx->Extensions.OES_compressed_ETC1_RGB8_texture = true;
     ctx->Extensions.OES_draw_texture = true;
     ctx->Extensions.OES_EGL_image = true;
     ctx->Extensions.OES_EGL_image_external = true;
     ctx->Extensions.OES_standard_derivatives = true;
     ctx->Extensions.OES_texture_float = true;
     ctx->Extensions.OES_texture_float_linear = true;
     ctx->Extensions.OES_texture_half_float = true;
     ctx->Extensions.OES_texture_half_float_linear = true;
  
     if (brw->gen >= 8)
        ctx->Const.GLSLVersion = 440;
     else if (brw->gen >= 6)
        ctx->Const.GLSLVersion = 330;
     else
        ctx->Const.GLSLVersion = 120;
     _mesa_override_glsl_version(&ctx->Const);
  
     ctx->Extensions.EXT_shader_integer_mix = ctx->Const.GLSLVersion >= 130;
     ctx->Extensions.MESA_shader_integer_functions = ctx->Const.GLSLVersion >= 130;
  
     if (brw->is_g4x || brw->gen >= 5) {
        ctx->Extensions.MESA_shader_framebuffer_fetch_non_coherent = true;
        ctx->Extensions.KHR_blend_equation_advanced = true;
     }
  
     if (brw->gen >= 5) {
        ctx->Extensions.ARB_texture_query_levels = ctx->Const.GLSLVersion >= 130;
        ctx->Extensions.ARB_texture_query_lod = true;
        ctx->Extensions.EXT_timer_query = true;
  
        if (brw->gen == 5 || can_write_oacontrol(brw)) {
           ctx->Extensions.AMD_performance_monitor = true;
           ctx->Extensions.INTEL_performance_query = true;
        }
     }
  
     if (brw->gen >= 6) {
        ctx->Extensions.ARB_blend_func_extended =
           !driQueryOptionb(&brw->optionCache, "disable_blend_func_extended");
        ctx->Extensions.ARB_conditional_render_inverted = true;
        ctx->Extensions.ARB_cull_distance = true;
        ctx->Extensions.ARB_draw_buffers_blend = true;
        ctx->Extensions.ARB_enhanced_layouts = true;
        ctx->Extensions.ARB_ES3_compatibility = true;
        ctx->Extensions.ARB_fragment_layer_viewport = true;
        ctx->Extensions.ARB_sample_shading = true;
        ctx->Extensions.ARB_shading_language_420pack = true;
        ctx->Extensions.ARB_texture_buffer_object = true;
        ctx->Extensions.ARB_texture_buffer_object_rgb32 = true;
        ctx->Extensions.ARB_texture_buffer_range = true;
        ctx->Extensions.ARB_texture_cube_map_array = true;
        ctx->Extensions.ARB_texture_gather = true;
        ctx->Extensions.ARB_texture_multisample = true;
        ctx->Extensions.ARB_uniform_buffer_object = true;
  
        ctx->Extensions.AMD_vertex_shader_layer = true;
        ctx->Extensions.EXT_framebuffer_multisample = true;
        ctx->Extensions.EXT_framebuffer_multisample_blit_scaled = true;
        ctx->Extensions.EXT_transform_feedback = true;
        ctx->Extensions.OES_depth_texture_cube_map = true;
        ctx->Extensions.OES_sample_variables = true;
  
        ctx->Extensions.ARB_timer_query = brw->intelScreen->hw_has_timestamp;
  
        /* Only enable this in core profile because other parts of Mesa behave
         * slightly differently when the extension is enabled.
         */
        if (ctx->API == API_OPENGL_CORE) {
           ctx->Extensions.ARB_shader_subroutine = true;
           ctx->Extensions.ARB_viewport_array = true;
           ctx->Extensions.AMD_vertex_shader_viewport_index = true;
        }
     }
  
     brw->predicate.supported = false;
     brw->can_do_pipelined_register_writes =
        can_do_pipelined_register_writes(brw);
  
     if (brw->gen >= 7) {
        ctx->Extensions.ARB_conservative_depth = true;
        ctx->Extensions.ARB_derivative_control = true;
        ctx->Extensions.ARB_framebuffer_no_attachments = true;
        ctx->Extensions.ARB_gpu_shader5 = true;
        ctx->Extensions.ARB_shader_atomic_counters = true;
        ctx->Extensions.ARB_shader_clock = true;
        ctx->Extensions.ARB_shader_image_load_store = true;
        ctx->Extensions.ARB_shader_image_size = true;
        ctx->Extensions.ARB_shader_texture_image_samples = true;
        ctx->Extensions.ARB_tessellation_shader = true;
        ctx->Extensions.ARB_texture_compression_bptc = true;
        ctx->Extensions.ARB_texture_view = true;
        ctx->Extensions.ARB_shader_storage_buffer_object = true;
        ctx->Extensions.EXT_shader_samples_identical = true;
        ctx->Extensions.OES_primitive_bounding_box = true;
        ctx->Extensions.OES_texture_buffer = true;
  
        if (brw->can_do_pipelined_register_writes) {
           ctx->Extensions.ARB_draw_indirect = true;
           ctx->Extensions.ARB_transform_feedback2 = true;
           ctx->Extensions.ARB_transform_feedback3 = true;
           ctx->Extensions.ARB_transform_feedback_instanced = true;
  
           if ((brw->gen >= 8 || brw->intelScreen->cmd_parser_version >= 5) &&
               ctx->Const.MaxComputeWorkGroupSize[0] >= 1024) {
              ctx->Extensions.ARB_compute_shader = true;
              ctx->Extensions.ARB_ES3_1_compatibility =
                 brw->gen >= 8 || brw->is_haswell;
           }
  
           if (brw->intelScreen->cmd_parser_version >= 2)
              brw->predicate.supported = true;
        }
     }
  
     if (brw->gen >= 8 || brw->is_haswell) {
        ctx->Extensions.ARB_stencil_texturing = true;
        ctx->Extensions.ARB_texture_stencil8 = true;
     }
  
     if (brw->gen >= 8 || brw->is_haswell || brw->is_baytrail) {
        ctx->Extensions.ARB_robust_buffer_access_behavior = true;
     }
  
     if (brw->intelScreen->has_mi_math_and_lrr) {
        ctx->Extensions.ARB_query_buffer_object = true;
     }
  
     if (brw->gen >= 8 || brw->is_baytrail) {
        /* For now, we only enable OES_copy_image on platforms that support
         * ETC2 natively in hardware.  We would need more hacks to support it
         * elsewhere.
         */
        ctx->Extensions.OES_copy_image = true;
     }
  
     if (brw->gen >= 8) {
        ctx->Extensions.ARB_shader_precision = true;
        ctx->Extensions.ARB_gpu_shader_fp64 = true;
        ctx->Extensions.ARB_vertex_attrib_64bit = true;
        ctx->Extensions.OES_geometry_shader = true;
        ctx->Extensions.OES_texture_cube_map_array = true;
     }
  
     if (brw->gen >= 9) {
        ctx->Extensions.KHR_blend_equation_advanced_coherent = true;
        ctx->Extensions.KHR_texture_compression_astc_ldr = true;
        ctx->Extensions.KHR_texture_compression_astc_sliced_3d = true;
        ctx->Extensions.ARB_shader_stencil_export = true;
        ctx->Extensions.MESA_shader_framebuffer_fetch = true;
     }
  
     if (ctx->API == API_OPENGL_CORE)
        ctx->Extensions.ARB_base_instance = true;
     if (ctx->API != API_OPENGL_CORE)
        ctx->Extensions.ARB_color_buffer_float = true;
  
     if (ctx->Mesa_DXTn || driQueryOptionb(&brw->optionCache, "force_s3tc_enable"))
        ctx->Extensions.EXT_texture_compression_s3tc = true;
  
     ctx->Extensions.ANGLE_texture_compression_dxt = true;
  }
  