static void
i915UpdateBlendState(struct gl_context * ctx)
{
struct i915_context *i915 = I915_CONTEXT(ctx);
GLuint iab = (i915->state.Blend[I915_BLENDREG_IAB] &
~(IAB_SRC_FACTOR_MASK |
IAB_DST_FACTOR_MASK |
(BLENDFUNC_MASK << IAB_FUNC_SHIFT) | IAB_ENABLE));
GLuint lis6 = (i915->state.Ctx[I915_CTXREG_LIS6] &
~(S6_CBUF_SRC_BLEND_FACT_MASK |
S6_CBUF_DST_BLEND_FACT_MASK | S6_CBUF_BLEND_FUNC_MASK));
GLuint eqRGB = ctx->Color.Blend[0].EquationRGB;
GLuint eqA = ctx->Color.Blend[0].EquationA;
GLuint srcRGB = ctx->Color.Blend[0].SrcRGB;
GLuint dstRGB = ctx->Color.Blend[0].DstRGB;
GLuint srcA = ctx->Color.Blend[0].SrcA;
GLuint dstA = ctx->Color.Blend[0].DstA;
if (eqRGB == GL_MIN || eqRGB == GL_MAX) {
srcRGB = dstRGB = GL_ONE;
}
if (eqA == GL_MIN || eqA == GL_MAX) {
srcA = dstA = GL_ONE;
}
lis6 |= SRC_BLND_FACT(intel_translate_blend_factor(srcRGB));
lis6 |= DST_BLND_FACT(intel_translate_blend_factor(dstRGB));
lis6 |= translate_blend_equation(eqRGB) << S6_CBUF_BLEND_FUNC_SHIFT;
iab |= SRC_ABLND_FACT(intel_translate_blend_factor(srcA));
iab |= DST_ABLND_FACT(intel_translate_blend_factor(dstA));
iab |= translate_blend_equation(eqA) << IAB_FUNC_SHIFT;
if (srcA != srcRGB || dstA != dstRGB || eqA != eqRGB)
iab |= IAB_ENABLE;
if (iab != i915->state.Blend[I915_BLENDREG_IAB]) {
i915->state.Blend[I915_BLENDREG_IAB] = iab;
I915_STATECHANGE(i915, I915_UPLOAD_BLEND);
}
if (lis6 != i915->state.Ctx[I915_CTXREG_LIS6]) {
i915->state.Ctx[I915_CTXREG_LIS6] = lis6;
I915_STATECHANGE(i915, I915_UPLOAD_CTX);
}
/* This will catch a logicop blend equation */
i915EvalLogicOpBlendState(ctx);
}
/**
* Sets both the blend equation (called "function" in i830 docs) and the
* blend function (called "factor" in i830 docs). This is done in a single
* function because some blend equations (i.e., \c GL_MIN and \c GL_MAX)
* change the interpretation of the blend function.
*/
static void
i830_set_blend_state(struct gl_context * ctx)
{
struct i830_context *i830 = i830_context(ctx);
int funcA;
int funcRGB;
int eqnA;
int eqnRGB;
int iab;
int s1;
funcRGB =
SRC_BLND_FACT(intel_translate_blend_factor(ctx->Color.Blend[0].SrcRGB))
| DST_BLND_FACT(intel_translate_blend_factor(ctx->Color.Blend[0].DstRGB));
switch (ctx->Color.Blend[0].EquationRGB) {
case GL_FUNC_ADD:
eqnRGB = BLENDFUNC_ADD;
break;
case GL_MIN:
eqnRGB = BLENDFUNC_MIN;
funcRGB = SRC_BLND_FACT(BLENDFACT_ONE) | DST_BLND_FACT(BLENDFACT_ONE);
break;
case GL_MAX:
eqnRGB = BLENDFUNC_MAX;
funcRGB = SRC_BLND_FACT(BLENDFACT_ONE) | DST_BLND_FACT(BLENDFACT_ONE);
break;
case GL_FUNC_SUBTRACT:
eqnRGB = BLENDFUNC_SUB;
break;
case GL_FUNC_REVERSE_SUBTRACT:
eqnRGB = BLENDFUNC_RVRSE_SUB;
break;
default:
fprintf(stderr, "[%s:%u] Invalid RGB blend equation (0x%04x).\n",
__FUNCTION__, __LINE__, ctx->Color.Blend[0].EquationRGB);
return;
}
funcA = SRC_ABLEND_FACT(intel_translate_blend_factor(ctx->Color.Blend[0].SrcA))
| DST_ABLEND_FACT(intel_translate_blend_factor(ctx->Color.Blend[0].DstA));
switch (ctx->Color.Blend[0].EquationA) {
case GL_FUNC_ADD:
eqnA = BLENDFUNC_ADD;
break;
case GL_MIN:
eqnA = BLENDFUNC_MIN;
funcA = SRC_BLND_FACT(BLENDFACT_ONE) | DST_BLND_FACT(BLENDFACT_ONE);
break;
case GL_MAX:
eqnA = BLENDFUNC_MAX;
funcA = SRC_BLND_FACT(BLENDFACT_ONE) | DST_BLND_FACT(BLENDFACT_ONE);
break;
case GL_FUNC_SUBTRACT:
eqnA = BLENDFUNC_SUB;
break;
case GL_FUNC_REVERSE_SUBTRACT:
eqnA = BLENDFUNC_RVRSE_SUB;
break;
default:
fprintf(stderr, "[%s:%u] Invalid alpha blend equation (0x%04x).\n",
__FUNCTION__, __LINE__, ctx->Color.Blend[0].EquationA);
return;
}
iab = eqnA | funcA
| _3DSTATE_INDPT_ALPHA_BLEND_CMD
| ENABLE_SRC_ABLEND_FACTOR | ENABLE_DST_ABLEND_FACTOR
| ENABLE_ALPHA_BLENDFUNC;
s1 = eqnRGB | funcRGB
| _3DSTATE_MODES_1_CMD
| ENABLE_SRC_BLND_FACTOR | ENABLE_DST_BLND_FACTOR
| ENABLE_COLR_BLND_FUNC;
if ((eqnA | funcA) != (eqnRGB | funcRGB))
iab |= ENABLE_INDPT_ALPHA_BLEND;
else
iab |= DISABLE_INDPT_ALPHA_BLEND;
if (iab != i830->state.Ctx[I830_CTXREG_IALPHAB] ||
s1 != i830->state.Ctx[I830_CTXREG_STATE1]) {
I830_STATECHANGE(i830, I830_UPLOAD_CTX);
i830->state.Ctx[I830_CTXREG_IALPHAB] = iab;
i830->state.Ctx[I830_CTXREG_STATE1] = s1;
}
/* This will catch a logicop blend equation. It will also ensure
* independant alpha blend is really in the correct state (either enabled
* or disabled) if blending is already enabled.
*/
i830EvalLogicOpBlendState(ctx);
if (0) {
fprintf(stderr,
"[%s:%u] STATE1: 0x%08x IALPHAB: 0x%08x blend is %sabled\n",
__FUNCTION__, __LINE__, i830->state.Ctx[I830_CTXREG_STATE1],
i830->state.Ctx[I830_CTXREG_IALPHAB],
(ctx->Color.BlendEnabled) ? "en" : "dis");
}
}