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GPU: Avoid stencil emulation if possible.

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This reduces use of replaceAlpha, and reduces use of more complicated
blend states.  This simplifies fragment shaders a little.
This commit is contained in:
Unknown W. Brackets 2018-12-01 14:05:29 -08:00
parent d8c80afe59
commit 5932cbabc3
6 changed files with 19 additions and 7 deletions
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17
GPU/Common/GPUStateUtils.cpp
View file

@ -40,6 +40,17 @@ bool CanUseHardwareTransform(int prim) {
return !gstate.isModeThrough() && prim != GE_PRIM_RECTANGLES;
}
bool IsStencilTestOutputDisabled() {
// The mask applies on all stencil ops.
if (gstate.isStencilTestEnabled() && (gstate.pmska & 0xFF) != 0xFF) {
if (gstate.FrameBufFormat() == GE_FORMAT_565) {
return true;
}
return gstate.getStencilOpZPass() == GE_STENCILOP_KEEP && gstate.getStencilOpZFail() == GE_STENCILOP_KEEP && gstate.getStencilOpSFail() == GE_STENCILOP_KEEP;
}
return true;
}
bool NeedsTestDiscard() {
// We assume this is called only when enabled and not trivially true (may also be for color testing.)
if (gstate.isStencilTestEnabled() && (gstate.pmska & 0xFF) != 0xFF)
@ -169,7 +180,7 @@ const bool nonAlphaDestFactors[16] = {
};
ReplaceAlphaType ReplaceAlphaWithStencil(ReplaceBlendType replaceBlend) {
if (!gstate.isStencilTestEnabled() || gstate.isModeClear()) {
if (IsStencilTestOutputDisabled() || gstate.isModeClear()) {
return REPLACE_ALPHA_NO;
}
@ -995,7 +1006,7 @@ void ConvertBlendState(GenericBlendState &blendState, bool allowShaderBlend) {
int constantAlpha = 255;
BlendFactor constantAlphaGL = BlendFactor::ONE;
if (gstate.isStencilTestEnabled() && replaceAlphaWithStencil == REPLACE_ALPHA_NO) {
if (!IsStencilTestOutputDisabled() && replaceAlphaWithStencil == REPLACE_ALPHA_NO) {
switch (ReplaceAlphaWithStencilType()) {
case STENCIL_VALUE_UNIFORM:
constantAlpha = gstate.getStencilTestRef();
@ -1163,7 +1174,7 @@ void ConvertBlendState(GenericBlendState &blendState, bool allowShaderBlend) {
blendState.setFactors(glBlendFuncA, glBlendFuncB, BlendFactor::ONE, BlendFactor::ZERO);
break;
}
} else if (gstate.isStencilTestEnabled()) {
} else if (!IsStencilTestOutputDisabled()) {
switch (ReplaceAlphaWithStencilType()) {
case STENCIL_VALUE_KEEP:
blendState.setFactors(glBlendFuncA, glBlendFuncB, BlendFactor::ZERO, BlendFactor::ONE);

1
GPU/Common/GPUStateUtils.h
View file

@ -45,6 +45,7 @@ bool IsColorTestAgainstZero();
bool IsColorTestTriviallyTrue();
bool IsAlphaTestAgainstZero();
bool NeedsTestDiscard();
bool IsStencilTestOutputDisabled();
StencilValueType ReplaceAlphaWithStencilType();
ReplaceAlphaType ReplaceAlphaWithStencil(ReplaceBlendType replaceBlend);

2
GPU/D3D11/StateMappingD3D11.cpp
View file

@ -223,7 +223,7 @@ void DrawEngineD3D11::ApplyDrawState(int prim) {
#endif
// Let's not write to alpha if stencil isn't enabled.
if (!gstate.isStencilTestEnabled()) {
if (IsStencilTestOutputDisabled()) {
amask = false;
} else {
// If the stencil type is set to KEEP, we shouldn't write to the stencil/alpha channel.

2
GPU/Directx9/StateMappingDX9.cpp
View file

@ -181,7 +181,7 @@ void DrawEngineDX9::ApplyDrawState(int prim) {
#endif
// Let's not write to alpha if stencil isn't enabled.
if (!gstate.isStencilTestEnabled()) {
if (IsStencilTestOutputDisabled()) {
amask = false;
} else {
// If the stencil type is set to KEEP, we shouldn't write to the stencil/alpha channel.

2
GPU/GLES/StateMappingGLES.cpp
View file

@ -143,7 +143,7 @@ void DrawEngineGLES::ApplyDrawState(int prim) {
// amask is needed for both stencil and blend state so we keep it outside for now
bool amask = (gstate.pmska & 0xFF) < 128;
// Let's not write to alpha if stencil isn't enabled.
if (!gstate.isStencilTestEnabled()) {
if (IsStencilTestOutputDisabled()) {
amask = false;
} else {
// If the stencil type is set to KEEP, we shouldn't write to the stencil/alpha channel.

2
GPU/Vulkan/StateMappingVulkan.cpp
View file

@ -225,7 +225,7 @@ void DrawEngineVulkan::ConvertStateToVulkanKey(FramebufferManagerVulkan &fbManag
#endif
// Let's not write to alpha if stencil isn't enabled.
if (!gstate.isStencilTestEnabled()) {
if (IsStencilTestOutputDisabled()) {
amask = false;
} else {
// If the stencil type is set to KEEP, we shouldn't write to the stencil/alpha channel.