text: /* -*- mode: C; c-file-style: "k&r"; tab-width 4; indent-tabs-mode: t; -*- */
  
  /*
   * Copyright (C) 2013 Rob Clark <robclark@freedesktop.org>
   *
   * 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
   * THE AUTHORS OR COPYRIGHT HOLDERS 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.
   *
   * Authors:
   *    Rob Clark <robclark@freedesktop.org>
   */
  
  #include "pipe/p_state.h"
  #include "util/u_blend.h"
  #include "util/u_dual_blend.h"
  #include "util/u_string.h"
  #include "util/u_memory.h"
  
  #include "fd3_blend.h"
  #include "fd3_context.h"
  #include "fd3_format.h"
  
  
  static enum a3xx_rb_blend_opcode
  blend_func(unsigned func)
  {
  	switch (func) {
  	case PIPE_BLEND_ADD:
  		return BLEND_DST_PLUS_SRC;
  	case PIPE_BLEND_MIN:
  		return BLEND_MIN_DST_SRC;
  	case PIPE_BLEND_MAX:
  		return BLEND_MAX_DST_SRC;
  	case PIPE_BLEND_SUBTRACT:
  		return BLEND_SRC_MINUS_DST;
  	case PIPE_BLEND_REVERSE_SUBTRACT:
  		return BLEND_DST_MINUS_SRC;
  	default:
  		DBG("invalid blend func: %x", func);
  		return 0;
  	}
  }
  
  void *
  fd3_blend_state_create(struct pipe_context *pctx,
  		const struct pipe_blend_state *cso)
  {
  	struct fd3_blend_stateobj *so;
  	enum a3xx_rop_code rop = ROP_COPY;
  	bool reads_dest = false;
  	int i;
  
  	if (cso->logicop_enable) {
  		rop = cso->logicop_func;  /* maps 1:1 */
  
  		switch (cso->logicop_func) {
  		case PIPE_LOGICOP_NOR:
  		case PIPE_LOGICOP_AND_INVERTED:
  		case PIPE_LOGICOP_AND_REVERSE:
  		case PIPE_LOGICOP_INVERT:
  		case PIPE_LOGICOP_XOR:
  		case PIPE_LOGICOP_NAND:
  		case PIPE_LOGICOP_AND:
  		case PIPE_LOGICOP_EQUIV:
  		case PIPE_LOGICOP_NOOP:
  		case PIPE_LOGICOP_OR_INVERTED:
  		case PIPE_LOGICOP_OR_REVERSE:
  		case PIPE_LOGICOP_OR:
  			reads_dest = true;
  			break;
  		}
  	}
  
  	so = CALLOC_STRUCT(fd3_blend_stateobj);
  	if (!so)
  		return NULL;
  
  	so->base = *cso;
  
  	for (i = 0; i < ARRAY_SIZE(so->rb_mrt); i++) {
  		const struct pipe_rt_blend_state *rt;
  		if (cso->independent_blend_enable)
  			rt = &cso->rt[i];
  		else
  			rt = &cso->rt[0];
  
  		so->rb_mrt[i].blend_control_rgb =
  				A3XX_RB_MRT_BLEND_CONTROL_RGB_SRC_FACTOR(fd_blend_factor(rt->rgb_src_factor)) |
  				A3XX_RB_MRT_BLEND_CONTROL_RGB_BLEND_OPCODE(blend_func(rt->rgb_func)) |
  				A3XX_RB_MRT_BLEND_CONTROL_RGB_DEST_FACTOR(fd_blend_factor(rt->rgb_dst_factor));
  
  		so->rb_mrt[i].blend_control_alpha =
  				A3XX_RB_MRT_BLEND_CONTROL_ALPHA_SRC_FACTOR(fd_blend_factor(rt->alpha_src_factor)) |
  				A3XX_RB_MRT_BLEND_CONTROL_ALPHA_BLEND_OPCODE(blend_func(rt->alpha_func)) |
  				A3XX_RB_MRT_BLEND_CONTROL_ALPHA_DEST_FACTOR(fd_blend_factor(rt->alpha_dst_factor));
  
  		so->rb_mrt[i].blend_control_no_alpha_rgb =
  				A3XX_RB_MRT_BLEND_CONTROL_RGB_SRC_FACTOR(fd_blend_factor(util_blend_dst_alpha_to_one(rt->rgb_src_factor))) |
  				A3XX_RB_MRT_BLEND_CONTROL_RGB_BLEND_OPCODE(blend_func(rt->rgb_func)) |
  				A3XX_RB_MRT_BLEND_CONTROL_RGB_DEST_FACTOR(fd_blend_factor(util_blend_dst_alpha_to_one(rt->rgb_dst_factor)));
  
  		so->rb_mrt[i].control =
  				A3XX_RB_MRT_CONTROL_ROP_CODE(rop) |
  				A3XX_RB_MRT_CONTROL_COMPONENT_ENABLE(rt->colormask);
  
  		if (rt->blend_enable)
  			so->rb_mrt[i].control |=
  					A3XX_RB_MRT_CONTROL_READ_DEST_ENABLE |
  					A3XX_RB_MRT_CONTROL_BLEND |
  					A3XX_RB_MRT_CONTROL_BLEND2;
  
  		if (reads_dest)
  			so->rb_mrt[i].control |= A3XX_RB_MRT_CONTROL_READ_DEST_ENABLE;
  
  		if (cso->dither)
  			so->rb_mrt[i].control |= A3XX_RB_MRT_CONTROL_DITHER_MODE(DITHER_ALWAYS);
  	}
  
  	if (cso->rt[0].blend_enable && util_blend_state_is_dual(cso, 0))
  		so->rb_render_control = A3XX_RB_RENDER_CONTROL_DUAL_COLOR_IN_ENABLE;
  
  	return so;
  }
  