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/**************************************************************************
*
* Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
* 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 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.
*
**************************************************************************/
/*
* Authors:
* Keith Whitwell <keith@tungstengraphics.com>
* Brian Paul
*/
#include "st_context.h"
#include "st_atom.h"
#include "pipe/p_context.h"
#include "pipe/p_defines.h"
/**
* Convert GLenum blend tokens to pipe tokens.
* Both blend factors and blend funcs are accepted.
*/
static GLuint
gl_blend_to_sp(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;
/*
return PIPE_BLENDFACTOR_SRC1_COLOR;
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_ALPHA;
case GL_ONE_MINUS_DST_ALPHA:
return PIPE_BLENDFACTOR_INV_DST_COLOR;
case GL_ONE_MINUS_CONSTANT_COLOR:
return PIPE_BLENDFACTOR_INV_CONST_COLOR;
case GL_ONE_MINUS_CONSTANT_ALPHA:
return PIPE_BLENDFACTOR_INV_CONST_ALPHA;
/*
return PIPE_BLENDFACTOR_INV_SRC1_COLOR;
return PIPE_BLENDFACTOR_INV_SRC1_ALPHA;
*/
default:
assert("invalid GL token in gl_blend_to_sp()" == NULL);
return 0;
}
}
/**
* Convert GLenum logicop tokens to pipe tokens.
*/
static GLuint
gl_logicop_to_sp(GLenum logicop)
{
switch (logicop) {
case GL_CLEAR:
return PIPE_LOGICOP_CLEAR;
case GL_NOR:
return PIPE_LOGICOP_NOR;
case GL_AND_INVERTED:
return PIPE_LOGICOP_AND_INVERTED;
case GL_COPY_INVERTED:
return PIPE_LOGICOP_COPY_INVERTED;
case GL_AND_REVERSE:
return PIPE_LOGICOP_AND_REVERSE;
case GL_INVERT:
return PIPE_LOGICOP_INVERT;
case GL_XOR:
return PIPE_LOGICOP_XOR;
case GL_NAND:
return PIPE_LOGICOP_NAND;
case GL_AND:
return PIPE_LOGICOP_AND;
case GL_EQUIV:
return PIPE_LOGICOP_EQUIV;
case GL_NOOP:
return PIPE_LOGICOP_NOOP;
case GL_OR_INVERTED:
return PIPE_LOGICOP_OR_INVERTED;
case GL_COPY:
return PIPE_LOGICOP_COPY;
case GL_OR_REVERSE:
return PIPE_LOGICOP_OR_REVERSE;
case GL_OR:
return PIPE_LOGICOP_OR;
case GL_SET:
return PIPE_LOGICOP_SET;
default:
assert("invalid GL token in gl_logicop_to_sp()" == NULL);
return 0;
}
}
static void
update_blend( struct st_context *st )
{
struct pipe_blend_state blend;
memset(&blend, 0, sizeof(blend));
if (st->ctx->Color.ColorLogicOpEnabled ||
(st->ctx->Color.BlendEnabled &&
st->ctx->Color.BlendEquationRGB == GL_LOGIC_OP)) {
/* logicop enabled */
blend.logicop_enable = 1;
blend.logicop_func = gl_logicop_to_sp(st->ctx->Color.LogicOp);
}
else if (st->ctx->Color.BlendEnabled) {
/* blending enabled */
blend.blend_enable = 1;
blend.rgb_func = gl_blend_to_sp(st->ctx->Color.BlendEquationRGB);
if (st->ctx->Color.BlendEquationRGB == GL_MIN ||
st->ctx->Color.BlendEquationRGB == GL_MAX) {
/* Min/max are special */
blend.rgb_src_factor = PIPE_BLENDFACTOR_ONE;
blend.rgb_dst_factor = PIPE_BLENDFACTOR_ONE;
}
else {
blend.rgb_src_factor = gl_blend_to_sp(st->ctx->Color.BlendSrcRGB);
blend.rgb_dst_factor = gl_blend_to_sp(st->ctx->Color.BlendDstRGB);
}
blend.alpha_func = gl_blend_to_sp(st->ctx->Color.BlendEquationA);
if (st->ctx->Color.BlendEquationA == GL_MIN ||
st->ctx->Color.BlendEquationA == GL_MAX) {
/* Min/max are special */
blend.alpha_src_factor = PIPE_BLENDFACTOR_ONE;
blend.alpha_dst_factor = PIPE_BLENDFACTOR_ONE;
}
else {
blend.alpha_src_factor = gl_blend_to_sp(st->ctx->Color.BlendSrcA);
blend.alpha_dst_factor = gl_blend_to_sp(st->ctx->Color.BlendDstA);
}
}
else {
/* no blending / logicop */
}
/* Colormask - maybe reverse these bits? */
if (st->ctx->Color.ColorMask[0])
blend.colormask |= PIPE_MASK_R;
if (st->ctx->Color.ColorMask[1])
blend.colormask |= PIPE_MASK_G;
if (st->ctx->Color.ColorMask[2])
blend.colormask |= PIPE_MASK_B;
if (st->ctx->Color.ColorMask[3])
blend.colormask |= PIPE_MASK_A;
if (st->ctx->Color.DitherFlag)
blend.dither = 1;
if (memcmp(&blend, &st->state.blend, sizeof(blend)) != 0) {
/* state has changed */
st->state.blend = blend; /* struct copy */
st->pipe->set_blend_state(st->pipe, &blend); /* set new state */
}
if (memcmp(st->ctx->Color.BlendColor, &st->state.blend_color, 4 * sizeof(GLfloat)) != 0) {
/* state has changed */
st->state.blend_color.color[0] = st->ctx->Color.BlendColor[0];
st->state.blend_color.color[1] = st->ctx->Color.BlendColor[1];
st->state.blend_color.color[2] = st->ctx->Color.BlendColor[2];
st->state.blend_color.color[3] = st->ctx->Color.BlendColor[3];
st->pipe->set_blend_color(st->pipe, (struct pipe_blend_color *) st->ctx->Color.BlendColor);
}
}
const struct st_tracked_state st_update_blend = {
.dirty = {
.mesa = (_NEW_COLOR), /* XXX _NEW_BLEND someday? */
.st = 0,
},
.update = update_blend
};
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