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/**************************************************************************
*
* Copyright 2007 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, 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 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.
*
**************************************************************************/
/*
* Authors:
* Keith Whitwell <keithw@vmware.com>
* Brian Paul
*/
#include "st_context.h"
#include "st_atom.h"
#include "pipe/p_context.h"
#include "pipe/p_defines.h"
#include "cso_cache/cso_context.h"
#include "framebuffer.h"
#include "main/blend.h"
#include "main/macros.h"
/**
* Convert GLenum blend tokens to pipe tokens.
* Both blend factors and blend funcs are accepted.
*/
static GLuint
translate_blend(GLenum blend)
{
switch (blend) {
/* blend functions */
case GL_FUNC_ADD:
return PIPE_BLEND_ADD;
case GL_FUNC_SUBTRACT:
return PIPE_BLEND_SUBTRACT;
case GL_FUNC_REVERSE_SUBTRACT:
return PIPE_BLEND_REVERSE_SUBTRACT;
case GL_MIN:
return PIPE_BLEND_MIN;
case GL_MAX:
return PIPE_BLEND_MAX;
/* blend factors */
case GL_ONE:
return PIPE_BLENDFACTOR_ONE;
case GL_SRC_COLOR:
return PIPE_BLENDFACTOR_SRC_COLOR;
case GL_SRC_ALPHA:
return PIPE_BLENDFACTOR_SRC_ALPHA;
case GL_DST_ALPHA:
return PIPE_BLENDFACTOR_DST_ALPHA;
case GL_DST_COLOR:
return PIPE_BLENDFACTOR_DST_COLOR;
case GL_SRC_ALPHA_SATURATE:
return PIPE_BLENDFACTOR_SRC_ALPHA_SATURATE;
case GL_CONSTANT_COLOR:
return PIPE_BLENDFACTOR_CONST_COLOR;
case GL_CONSTANT_ALPHA:
return PIPE_BLENDFACTOR_CONST_ALPHA;
case GL_SRC1_COLOR:
return PIPE_BLENDFACTOR_SRC1_COLOR;
case GL_SRC1_ALPHA:
return PIPE_BLENDFACTOR_SRC1_ALPHA;
case GL_ZERO:
return PIPE_BLENDFACTOR_ZERO;
case GL_ONE_MINUS_SRC_COLOR:
return PIPE_BLENDFACTOR_INV_SRC_COLOR;
case GL_ONE_MINUS_SRC_ALPHA:
return PIPE_BLENDFACTOR_INV_SRC_ALPHA;
case GL_ONE_MINUS_DST_COLOR:
return PIPE_BLENDFACTOR_INV_DST_COLOR;
case GL_ONE_MINUS_DST_ALPHA:
return PIPE_BLENDFACTOR_INV_DST_ALPHA;
case GL_ONE_MINUS_CONSTANT_COLOR:
return PIPE_BLENDFACTOR_INV_CONST_COLOR;
case GL_ONE_MINUS_CONSTANT_ALPHA:
return PIPE_BLENDFACTOR_INV_CONST_ALPHA;
case GL_ONE_MINUS_SRC1_COLOR:
return PIPE_BLENDFACTOR_INV_SRC1_COLOR;
case GL_ONE_MINUS_SRC1_ALPHA:
return PIPE_BLENDFACTOR_INV_SRC1_ALPHA;
default:
assert("invalid GL token in translate_blend()" == NULL);
return 0;
}
}
/**
* Figure out if colormasks are different per rt.
*/
static GLboolean
colormask_per_rt(const struct gl_context *ctx, unsigned num_cb)
{
GLbitfield full_mask = _mesa_replicate_colormask(0xf, num_cb);
GLbitfield repl_mask0 =
_mesa_replicate_colormask(GET_COLORMASK(ctx->Color.ColorMask, 0),
num_cb);
return (ctx->Color.ColorMask & full_mask) != repl_mask0;
}
/**
* Figure out if blend enables/state are different per rt.
*/
static GLboolean
blend_per_rt(const struct gl_context *ctx, unsigned num_cb)
{
GLbitfield cb_mask = u_bit_consecutive(0, num_cb);
GLbitfield blend_enabled = ctx->Color.BlendEnabled & cb_mask;
if (blend_enabled && blend_enabled != cb_mask) {
/* This can only happen if GL_EXT_draw_buffers2 is enabled */
return GL_TRUE;
}
if (ctx->Color._BlendFuncPerBuffer || ctx->Color._BlendEquationPerBuffer) {
/* this can only happen if GL_ARB_draw_buffers_blend is enabled */
return GL_TRUE;
}
return GL_FALSE;
}
void
st_update_blend( struct st_context *st )
{
struct pipe_blend_state *blend = &st->state.blend;
const struct gl_context *ctx = st->ctx;
unsigned num_cb = st->state.fb_num_cb;
unsigned num_state = 1;
unsigned i, j;
memset(blend, 0, sizeof(*blend));
if (num_cb > 1 &&
(blend_per_rt(ctx, num_cb) || colormask_per_rt(ctx, num_cb))) {
num_state = num_cb;
blend->independent_blend_enable = 1;
}
for (i = 0; i < num_state; i++)
blend->rt[i].colormask = GET_COLORMASK(ctx->Color.ColorMask, i);
if (ctx->Color.ColorLogicOpEnabled) {
/* logicop enabled */
blend->logicop_enable = 1;
blend->logicop_func = ctx->Color._LogicOp;
}
else if (ctx->Color.BlendEnabled && !ctx->Color._AdvancedBlendMode) {
/* blending enabled */
for (i = 0, j = 0; i < num_state; i++) {
if (!(ctx->Color.BlendEnabled & (1 << i)) ||
!blend->rt[i].colormask)
continue;
if (ctx->Extensions.ARB_draw_buffers_blend)
j = i;
blend->rt[i].blend_enable = 1;
blend->rt[i].rgb_func =
translate_blend(ctx->Color.Blend[j].EquationRGB);
if (ctx->Color.Blend[i].EquationRGB == GL_MIN ||
ctx->Color.Blend[i].EquationRGB == GL_MAX) {
/* Min/max are special */
blend->rt[i].rgb_src_factor = PIPE_BLENDFACTOR_ONE;
blend->rt[i].rgb_dst_factor = PIPE_BLENDFACTOR_ONE;
}
else {
blend->rt[i].rgb_src_factor =
translate_blend(ctx->Color.Blend[j].SrcRGB);
blend->rt[i].rgb_dst_factor =
translate_blend(ctx->Color.Blend[j].DstRGB);
}
blend->rt[i].alpha_func =
translate_blend(ctx->Color.Blend[j].EquationA);
if (ctx->Color.Blend[i].EquationA == GL_MIN ||
ctx->Color.Blend[i].EquationA == GL_MAX) {
/* Min/max are special */
blend->rt[i].alpha_src_factor = PIPE_BLENDFACTOR_ONE;
blend->rt[i].alpha_dst_factor = PIPE_BLENDFACTOR_ONE;
}
else {
blend->rt[i].alpha_src_factor =
translate_blend(ctx->Color.Blend[j].SrcA);
blend->rt[i].alpha_dst_factor =
translate_blend(ctx->Color.Blend[j].DstA);
}
}
}
else {
/* no blending / logicop */
}
blend->dither = ctx->Color.DitherFlag;
if (_mesa_is_multisample_enabled(ctx) &&
!(ctx->DrawBuffer->_IntegerBuffers & 0x1)) {
/* Unlike in gallium/d3d10 these operations are only performed
* if both msaa is enabled and we have a multisample buffer.
*/
blend->alpha_to_coverage = ctx->Multisample.SampleAlphaToCoverage;
blend->alpha_to_one = ctx->Multisample.SampleAlphaToOne;
}
cso_set_blend(st->cso_context, blend);
}
void
st_update_blend_color(struct st_context *st)
{
struct pipe_blend_color bc;
COPY_4FV(bc.color, st->ctx->Color.BlendColorUnclamped);
cso_set_blend_color(st->cso_context, &bc);
}
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