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gl_rasterizer: Move alpha testing to the OpenGL pipeline

Removes the alpha testing code from each fragment shader invocation.
This commit is contained in:
ReinUsesLisp 2019-05-21 20:28:09 -03:00
parent df509486c4
commit b76df62c00
8 changed files with 33 additions and 71 deletions

View file

@ -663,13 +663,10 @@ void RasterizerOpenGL::DrawArrays() {
SyncCullMode();
SyncPrimitiveRestart();
SyncScissorTest(state);
// Alpha Testing is synced on shaders.
SyncTransformFeedback();
SyncPointState();
CheckAlphaTests();
SyncPolygonOffset();
// TODO(bunnei): Sync framebuffer_scale uniform here
// TODO(bunnei): Sync scissorbox uniform(s) here
SyncAlphaTest();
// Draw the vertex batch
const bool is_indexed = accelerate_draw == AccelDraw::Indexed;
@ -1121,10 +1118,17 @@ void RasterizerOpenGL::SyncPolygonOffset() {
state.polygon_offset.clamp = regs.polygon_offset_clamp;
}
void RasterizerOpenGL::CheckAlphaTests() {
void RasterizerOpenGL::SyncAlphaTest() {
const auto& regs = system.GPU().Maxwell3D().regs;
UNIMPLEMENTED_IF_MSG(regs.alpha_test_enabled != 0 && regs.rt_control.count > 1,
"Alpha Testing is enabled with more than one rendertarget");
state.alpha_test.enabled = regs.alpha_test_enabled;
if (!state.alpha_test.enabled) {
return;
}
state.alpha_test.func = MaxwellToGL::ComparisonOp(regs.alpha_test_func);
state.alpha_test.ref = regs.alpha_test_ref;
}
} // namespace OpenGL

View file

@ -166,8 +166,8 @@ private:
/// Syncs the polygon offsets
void SyncPolygonOffset();
/// Check asserts for alpha testing.
void CheckAlphaTests();
/// Syncs the alpha test state to match the guest state
void SyncAlphaTest();
/// Check for extension that are not strictly required
/// but are needed for correct emulation

View file

@ -1447,27 +1447,9 @@ private:
UNIMPLEMENTED_IF_MSG(header.ps.omap.sample_mask != 0, "Sample mask write is unimplemented");
code.AddLine("if (alpha_test[0] != 0) {{");
++code.scope;
// We start on the register containing the alpha value in the first RT.
u32 current_reg = 3;
for (u32 render_target = 0; render_target < Maxwell::NumRenderTargets; ++render_target) {
// TODO(Blinkhawk): verify the behavior of alpha testing on hardware when
// multiple render targets are used.
if (header.ps.IsColorComponentOutputEnabled(render_target, 0) ||
header.ps.IsColorComponentOutputEnabled(render_target, 1) ||
header.ps.IsColorComponentOutputEnabled(render_target, 2) ||
header.ps.IsColorComponentOutputEnabled(render_target, 3)) {
code.AddLine("if (!AlphaFunc({})) discard;", SafeGetRegister(current_reg));
current_reg += 4;
}
}
--code.scope;
code.AddLine("}}");
// Write the color outputs using the data in the shader registers, disabled
// rendertargets/components are skipped in the register assignment.
current_reg = 0;
u32 current_reg = 0;
for (u32 render_target = 0; render_target < Maxwell::NumRenderTargets; ++render_target) {
// TODO(Subv): Figure out how dual-source blending is configured in the Switch.
for (u32 component = 0; component < 4; ++component) {

View file

@ -28,7 +28,6 @@ layout (location = 0) out vec4 position;
layout (std140, binding = EMULATION_UBO_BINDING) uniform vs_config {
vec4 viewport_flip;
uvec4 config_pack; // instance_id, flip_stage, y_direction, padding
uvec4 alpha_test;
};
)";
@ -91,7 +90,6 @@ layout (location = 0) out vec4 position;
layout (std140, binding = EMULATION_UBO_BINDING) uniform gs_config {
vec4 viewport_flip;
uvec4 config_pack; // instance_id, flip_stage, y_direction, padding
uvec4 alpha_test;
};
)";
@ -129,33 +127,8 @@ layout (location = 0) in noperspective vec4 position;
layout (std140, binding = EMULATION_UBO_BINDING) uniform fs_config {
vec4 viewport_flip;
uvec4 config_pack; // instance_id, flip_stage, y_direction, padding
uvec4 alpha_test;
};
bool AlphaFunc(in float value) {
float ref = uintBitsToFloat(alpha_test[2]);
switch (alpha_test[1]) {
case 1:
return false;
case 2:
return value < ref;
case 3:
return value == ref;
case 4:
return value <= ref;
case 5:
return value > ref;
case 6:
return value != ref;
case 7:
return value >= ref;
case 8:
return true;
default:
return false;
}
}
)";
const ShaderIR program_ir(setup.program.code, PROGRAM_OFFSET);
ProgramResult program =

View file

@ -48,17 +48,6 @@ void MaxwellUniformData::SetFromRegs(const Maxwell3D& maxwell, std::size_t shade
viewport_flip[0] = regs.viewport_transform[0].scale_x < 0.0 ? -1.0f : 1.0f;
viewport_flip[1] = regs.viewport_transform[0].scale_y < 0.0 ? -1.0f : 1.0f;
auto func{static_cast<u32>(regs.alpha_test_func)};
// Normalize the gl variants of opCompare to be the same as the normal variants
const u32 op_gl_variant_base = static_cast<u32>(Maxwell3D::Regs::ComparisonOp::Never);
if (func >= op_gl_variant_base) {
func = func - op_gl_variant_base + 1U;
}
alpha_test.enabled = regs.alpha_test_enabled;
alpha_test.func = func;
alpha_test.ref = regs.alpha_test_ref;
instance_id = state.current_instance;
// Assign in which stage the position has to be flipped

View file

@ -27,14 +27,8 @@ struct MaxwellUniformData {
GLuint flip_stage;
GLfloat y_direction;
};
struct alignas(16) {
GLuint enabled;
GLuint func;
GLfloat ref;
GLuint padding;
} alpha_test;
};
static_assert(sizeof(MaxwellUniformData) == 48, "MaxwellUniformData structure size is incorrect");
static_assert(sizeof(MaxwellUniformData) == 32, "MaxwellUniformData structure size is incorrect");
static_assert(sizeof(MaxwellUniformData) < 16384,
"MaxwellUniformData structure must be less than 16kb as per the OpenGL spec");

View file

@ -156,6 +156,10 @@ OpenGLState::OpenGLState() {
polygon_offset.factor = 0.0f;
polygon_offset.units = 0.0f;
polygon_offset.clamp = 0.0f;
alpha_test.enabled = false;
alpha_test.func = GL_ALWAYS;
alpha_test.ref = 0.0f;
}
void OpenGLState::ApplyDefaultState() {
@ -461,6 +465,14 @@ void OpenGLState::ApplyPolygonOffset() const {
}
}
void OpenGLState::ApplyAlphaTest() const {
Enable(GL_ALPHA_TEST, cur_state.alpha_test.enabled, alpha_test.enabled);
if (UpdateTie(std::tie(cur_state.alpha_test.func, cur_state.alpha_test.ref),
std::tie(alpha_test.func, alpha_test.ref))) {
glAlphaFunc(alpha_test.func, alpha_test.ref);
}
}
void OpenGLState::ApplyTextures() const {
bool has_delta{};
std::size_t first{};
@ -533,6 +545,7 @@ void OpenGLState::Apply() const {
ApplyTextures();
ApplySamplers();
ApplyPolygonOffset();
ApplyAlphaTest();
}
void OpenGLState::EmulateViewportWithScissor() {

View file

@ -172,6 +172,12 @@ public:
GLfloat clamp;
} polygon_offset;
struct {
bool enabled; // GL_ALPHA_TEST
GLenum func; // GL_ALPHA_TEST_FUNC
GLfloat ref; // GL_ALPHA_TEST_REF
} alpha_test;
std::array<bool, 8> clip_distance; // GL_CLIP_DISTANCE
OpenGLState();
@ -215,6 +221,7 @@ public:
void ApplySamplers() const;
void ApplyDepthClamp() const;
void ApplyPolygonOffset() const;
void ApplyAlphaTest() const;
/// Set the initial OpenGL state
static void ApplyDefaultState();