static void
update_blend( struct st_context *st )
{
struct pipe_blend_state *blend = &st->state.blend;
unsigned num_state = 1;
unsigned i;
memset(blend, 0, sizeof(*blend));
if (blend_per_rt(st->ctx) || colormask_per_rt(st->ctx)) {
num_state = st->ctx->Const.MaxDrawBuffers;
blend->independent_blend_enable = 1;
}
/* Note it is impossible to correctly deal with EXT_blend_logic_op and
EXT_draw_buffers2/EXT_blend_equation_separate at the same time.
These combinations would require support for per-rt logicop enables
and separate alpha/rgb logicop/blend support respectively. Neither
possible in gallium nor most hardware. Assume these combinations
don't happen. */
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 = translate_logicop(st->ctx->Color.LogicOp);
}
else if (st->ctx->Color.BlendEnabled) {
/* blending enabled */
for (i = 0; i < num_state; i++) {
blend->rt[i].blend_enable = (st->ctx->Color.BlendEnabled >> i) & 0x1;
blend->rt[i].rgb_func = translate_blend(st->ctx->Color.BlendEquationRGB);
if (st->ctx->Color.BlendEquationRGB == GL_MIN ||
st->ctx->Color.BlendEquationRGB == 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(st->ctx->Color.BlendSrcRGB);
blend->rt[i].rgb_dst_factor = translate_blend(st->ctx->Color.BlendDstRGB);
}
blend->rt[i].alpha_func = translate_blend(st->ctx->Color.BlendEquationA);
if (st->ctx->Color.BlendEquationA == GL_MIN ||
st->ctx->Color.BlendEquationA == 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(st->ctx->Color.BlendSrcA);
blend->rt[i].alpha_dst_factor = translate_blend(st->ctx->Color.BlendDstA);
}
}
}
else {
/* no blending / logicop */
}
/* Colormask - maybe reverse these bits? */
for (i = 0; i < num_state; i++) {
static void
update_blend( struct st_context *st )
{
struct pipe_blend_state *blend = &st->state.blend;
const struct gl_context *ctx = st->ctx;
unsigned num_state = 1;
unsigned i, j;
memset(blend, 0, sizeof(*blend));
if (blend_per_rt(ctx) || colormask_per_rt(ctx)) {
num_state = ctx->Const.MaxDrawBuffers;
blend->independent_blend_enable = 1;
}
if (ctx->Color.ColorLogicOpEnabled) {
/* logicop enabled */
blend->logicop_enable = 1;
blend->logicop_func = translate_logicop(ctx->Color.LogicOp);
}
else if (ctx->Color.BlendEnabled) {
/* blending enabled */
for (i = 0, j = 0; i < num_state; i++) {
blend->rt[i].blend_enable = (ctx->Color.BlendEnabled >> i) & 0x1;
if (ctx->Extensions.ARB_draw_buffers_blend)
j = i;
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 */
}
/* Colormask - maybe reverse these bits? */
for (i = 0; i < num_state; i++) {