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Shaders: Implemented reading the gl_InstanceID and gl_VertexID variables in the vertex shader.

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This commit is contained in:
Subv 2018-05-30 10:58:03 -05:00
parent 5a763e8a5a
commit 99f12b05fa
2 changed files with 11 additions and 1 deletions
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4
src/video_core/engines/shader_bytecode.h
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@ -75,6 +75,10 @@ union Attribute {
enum class Index : u64 {
Position = 7,
Attribute_0 = 8,
// This attribute contains a tuple of (~, ~, InstanceId, VertexId) when inside a vertex
// shader, and a tuple of (TessCoord.x, TessCoord.y, TessCoord.z, ~) when inside a Tess Eval
// shader.
TessCoordInstanceIDVertexID = 47,
};
union {

8
src/video_core/renderer_opengl/gl_shader_decompiler.cpp
View file

@ -299,7 +299,7 @@ public:
* are stored as floats, so this may require conversion.
* @param reg The destination register to use.
* @param elem The element to use for the operation.
* @param attribute The input attibute to use as the source value.
* @param attribute The input attribute to use as the source value.
*/
void SetRegisterToInputAttibute(const Register& reg, u64 elem, Attribute::Index attribute) {
std::string dest = GetRegisterAsFloat(reg);
@ -451,6 +451,12 @@ private:
switch (attribute) {
case Attribute::Index::Position:
return "position";
case Attribute::Index::TessCoordInstanceIDVertexID:
// TODO(Subv): Find out what the values are for the first two elements when inside a
// vertex shader, and what's the value of the fourth element when inside a Tess Eval
// shader.
ASSERT(stage == Maxwell3D::Regs::ShaderStage::Vertex);
return "vec4(0, 0, gl_InstanceID, gl_VertexID)";
default:
const u32 index{static_cast<u32>(attribute) -
static_cast<u32>(Attribute::Index::Attribute_0)};