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gl_shader_decompiler: Remove guest "position" varying 

"position" was being written but not read anywhere besides geometry
shaders, where it had the same value as gl_Position.

This commit replaces "position" with gl_Position, reducing the
complexity of our code and the emitted GLSL code.
This commit is contained in:
ReinUsesLisp 2019-06-03 01:01:34 -03:00
parent e70f16fff7
commit 0935c2d97b
2 changed files with 21 additions and 36 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

38
src/video_core/renderer_opengl/gl_shader_decompiler.cpp
View File

@ -45,7 +45,6 @@ struct TextureAoffi {};
using TextureArgument = std::pair<Type, Node>;
using TextureIR = std::variant<TextureAoffi, TextureArgument>;
enum : u32 { POSITION_VARYING_LOCATION = 0, GENERIC_VARYING_START_LOCATION = 1 };
constexpr u32 MAX_CONSTBUFFER_ELEMENTS =
static_cast<u32>(RasterizerOpenGL::MaxConstbufferSize) / (4 * sizeof(float));
@ -247,6 +246,12 @@ private:
code.AddLine("layout ({}, max_vertices = {}) out;", topology, max_vertices);
code.AddNewLine();
code.AddLine("in gl_PerVertex {{");
++code.scope;
code.AddLine("vec4 gl_Position;");
--code.scope;
code.AddLine("}} gl_in[];");
DeclareVertexRedeclarations();
}
@ -349,7 +354,7 @@ private:
}
void DeclareInputAttribute(Attribute::Index index, bool skip_unused) {
const u32 generic_index{GetGenericAttributeIndex(index)};
const u32 location{GetGenericAttributeIndex(index)};
std::string name{GetInputAttribute(index)};
if (stage == ShaderStage::Geometry) {
@ -358,19 +363,13 @@ private:
std::string suffix;
if (stage == ShaderStage::Fragment) {
const auto input_mode{header.ps.GetAttributeUse(generic_index)};
const auto input_mode{header.ps.GetAttributeUse(location)};
if (skip_unused && input_mode == AttributeUse::Unused) {
return;
}
suffix = GetInputFlags(input_mode);
}
u32 location = generic_index;
if (stage != ShaderStage::Vertex) {
// If inputs are varyings, add an offset
location += GENERIC_VARYING_START_LOCATION;
}
code.AddLine("layout (location = {}) {} in vec4 {};", location, suffix, name);
}
@ -395,7 +394,7 @@ private:
}
void DeclareOutputAttribute(Attribute::Index index) {
const u32 location{GetGenericAttributeIndex(index) + GENERIC_VARYING_START_LOCATION};
const u32 location{GetGenericAttributeIndex(index)};
code.AddLine("layout (location = {}) out vec4 {};", location, GetOutputAttribute(index));
}
@ -633,10 +632,14 @@ private:
switch (attribute) {
case Attribute::Index::Position:
if (stage != ShaderStage::Fragment) {
return GeometryPass("position") + GetSwizzle(element);
} else {
switch (stage) {
case ShaderStage::Geometry:
return fmt::format("gl_in[ftou({})].gl_Position{}", Visit(buffer),
GetSwizzle(element));
case ShaderStage::Fragment:
return element == 3 ? "1.0f" : ("gl_FragCoord"s + GetSwizzle(element));
default:
UNREACHABLE();
}
case Attribute::Index::PointCoord:
switch (element) {
@ -921,7 +924,7 @@ private:
target = [&]() -> std::string {
switch (const auto attribute = abuf->GetIndex(); abuf->GetIndex()) {
case Attribute::Index::Position:
return "position"s + GetSwizzle(abuf->GetElement());
return "gl_Position"s + GetSwizzle(abuf->GetElement());
case Attribute::Index::PointSize:
return "gl_PointSize";
case Attribute::Index::ClipDistances0123:
@ -1506,9 +1509,7 @@ private:
// If a geometry shader is attached, it will always flip (it's the last stage before
// fragment). For more info about flipping, refer to gl_shader_gen.cpp.
code.AddLine("position.xy *= viewport_flip.xy;");
code.AddLine("gl_Position = position;");
code.AddLine("position.w = 1.0;");
code.AddLine("gl_Position.xy *= viewport_flip.xy;");
code.AddLine("EmitVertex();");
return {};
}
@ -1746,8 +1747,7 @@ private:
}
u32 GetNumPhysicalVaryings() const {
return std::min<u32>(device.GetMaxVaryings() - GENERIC_VARYING_START_LOCATION,
Maxwell::NumVaryings);
return std::min<u32>(device.GetMaxVaryings(), Maxwell::NumVaryings);
}
const Device& device;

19
src/video_core/renderer_opengl/gl_shader_gen.cpp
View File

@ -23,8 +23,6 @@ ProgramResult GenerateVertexShader(const Device& device, const ShaderSetup& setu
out += GetCommonDeclarations();
out += R"(
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
@ -48,7 +46,6 @@ layout (std140, binding = EMULATION_UBO_BINDING) uniform vs_config {
out += R"(
void main() {
position = vec4(0.0, 0.0, 0.0, 0.0);
execute_vertex();
)";
@ -59,19 +56,12 @@ void main() {
out += R"(
// Set Position Y direction
position.y *= utof(config_pack[2]);
gl_Position.y *= utof(config_pack[2]);
// Check if the flip stage is VertexB
// Config pack's second value is flip_stage
if (config_pack[1] == 1) {
// Viewport can be flipped, which is unsupported by glViewport
position.xy *= viewport_flip.xy;
}
gl_Position = position;
// TODO(bunnei): This is likely a hack, position.w should be interpolated as 1.0
// For now, this is here to bring order in lieu of proper emulation
if (config_pack[1] == 1) {
position.w = 1.0;
gl_Position.xy *= viewport_flip.xy;
}
})";
@ -85,9 +75,6 @@ ProgramResult GenerateGeometryShader(const Device& device, const ShaderSetup& se
out += GetCommonDeclarations();
out += R"(
layout (location = 0) in vec4 gs_position[];
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
@ -124,8 +111,6 @@ layout (location = 5) out vec4 FragColor5;
layout (location = 6) out vec4 FragColor6;
layout (location = 7) out vec4 FragColor7;
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