Fix control flow analysis bug

include/PICA/draw_acceleration.hpp

@@ -14,6 +14,7 @@ namespace PICA {
 			u32 size;
 			u32 stride;
 
+			u8 inputReg; // Which input reg should this attribute go to in the vertex shader?
 			u8 type;
 			u8 componentCount;
 			bool fixed;
@@ -27,6 +28,7 @@ namespace PICA {
 		// Minimum and maximum index in the index buffer for a draw call
 		u16 minimumIndex, maximumIndex;
 		u32 totalAttribCount;
+		u32 enabledAttributeMask;
 		u32 vertexDataSize;
 
 		std::array<AttributeInfo, maxAttribCount> attributeInfo;

include/renderer_gl/renderer_gl.hpp

@@ -70,6 +70,9 @@ class RendererGL final : public Renderer {
 	GLuint maximumIndex = 0;
 	void* hwIndexBufferOffset = nullptr;
 
+	// When doing hw shaders, we cache which attributes are enabled in our VAO to avoid having to enable/disable all attributes on each draw
+	u32 previousAttributeMask = 0;
+
 	// Cached pointer to the current vertex shader when using HW accelerated shaders
 	OpenGL::Shader* generatedVertexShader = nullptr;
 

src/core/PICA/draw_acceleration.cpp

@@ -8,7 +8,8 @@
 void GPU::getAcceleratedDrawInfo(PICA::DrawAcceleration& accel, bool indexed) {
 	accel.indexed = indexed;
 	accel.totalAttribCount = totalAttribCount;
-
+	accel.enabledAttributeMask = 0;
+	
 	const u32 vertexBase = ((regs[PICA::InternalRegs::VertexAttribLoc] >> 1) & 0xfffffff) * 16;
 	const u32 vertexCount = regs[PICA::InternalRegs::VertexCountReg];  // Total # of vertices to transfer
 
@@ -50,6 +51,8 @@ void GPU::getAcceleratedDrawInfo(PICA::DrawAcceleration& accel, bool indexed) {
 	}
 
 	const u64 vertexCfg = u64(regs[PICA::InternalRegs::AttribFormatLow]) | (u64(regs[PICA::InternalRegs::AttribFormatHigh]) << 32);
+	const u64 inputAttrCfg = getVertexShaderInputConfig();
+
 	u32 buffer = 0;
 	u32 attrCount = 0;
 	accel.vertexDataSize = 0;
@@ -94,7 +97,11 @@ void GPU::getAcceleratedDrawInfo(PICA::DrawAcceleration& accel, bool indexed) {
 			
 				// Size of each component based on the attribute type
 				static constexpr u32 sizePerComponent[4] = {1, 1, 2, 4};
+				const u32 inputReg = (inputAttrCfg >> (attrCount * 4)) & 0xf;
+				// Mark the attribute as enabled
+				accel.enabledAttributeMask |= 1 << inputReg;
 
+				attr.inputReg = inputReg;
 				attr.componentCount = size;
 				attr.offset = attributeOffset;
 				attr.size = size * sizePerComponent[attribType];
@@ -123,6 +130,9 @@ void GPU::getAcceleratedDrawInfo(PICA::DrawAcceleration& accel, bool indexed) {
 				attr.fixedValue[i] = fixedAttr[i].toFloat32();
 			}
 
+			const u32 inputReg = (inputAttrCfg >> (attrCount * 4)) & 0xf;
+
+			attr.inputReg = inputReg;
 			attrCount += 1;
 		}
 	}

src/core/PICA/shader_decompiler.cpp

@@ -79,7 +79,7 @@ ExitMode ControlFlow::analyzeFunction(const PICAShader& shader, u32 start, u32 e
 
 				// This opens up 2 parallel paths of execution
 				auto branchTakenExit = analyzeFunction(shader, dest, end, labels);
-				auto branchNotTakenExit = analyzeFunction(shader, pc + 1, dest, labels);
+				auto branchNotTakenExit = analyzeFunction(shader, pc + 1, end, labels);
 				it->second = exitParallel(branchTakenExit, branchNotTakenExit);
 				return it->second;
 			}
@@ -122,6 +122,7 @@ ExitMode ControlFlow::analyzeFunction(const PICAShader& shader, u32 start, u32 e
 				}
 				break;
 			}
+
 			case ShaderOpcodes::CALL: {
 				const u32 num = instruction & 0xff;
 				const u32 dest = getBits<10, 12>(instruction);

src/core/PICA/shader_gen_glsl.cpp

@@ -778,8 +778,6 @@ void main() {
 	gl_ClipDistance[1] = dot(clipCoords, a_coords);
 #endif
 })";
-		
-		std::cout << ret << "\n";
 		return ret;
 	}
 }

src/core/renderer_gl/renderer_gl.cpp

@@ -2,6 +2,7 @@
 
 #include <stb_image_write.h>
 
+#include <bit>
 #include <cmrc/cmrc.hpp>
 
 #include "PICA/float_types.hpp"
@@ -987,7 +988,7 @@ bool RendererGL::prepareForDraw(ShaderUnit& shaderUnit, PICA::DrawAcceleration*
 				shaderUnit.vs, *emulatorConfig, shaderUnit.vs.entrypoint, PICA::ShaderGen::API::GL, PICA::ShaderGen::Language::GLSL
 			);
 
-			// Empty source means compilation error, if the source is not empty then we convert the rcompiled PICA code into a valid shader and upload
+			// Empty source means compilation error, if the source is not empty then we convert the recompiled PICA code into a valid shader and upload
 			// it to the GPU
 			if (!picaShaderSource.empty()) {
 				std::string vertexShaderSource = fragShaderGen.getVertexShaderAccelerated(picaShaderSource, vertexConfig, usingUbershader);
@@ -1167,24 +1168,49 @@ void RendererGL::accelerateVertexUpload(ShaderUnit& shaderUnit, PICA::DrawAccele
 
 	gl.bindVAO(hwShaderVAO);
 
+	// Enable or disable vertex attributes as needed
+	const u32 currentAttributeMask = accel->enabledAttributeMask;
+	// Use bitwise xor to calculate which attributes chanced
+	u32 attributeMaskDiff = currentAttributeMask ^ previousAttributeMask;
+	
+	while (attributeMaskDiff != 0) {
+		// Get index of next different attribute and turn it off
+		const u32 index = 31 - std::countl_zero<u32>(attributeMaskDiff);
+		const u32 mask = 1u << index;
+		attributeMaskDiff ^= mask;
+
+		if ((currentAttributeMask & mask) != 0) {
+			// Attribute was disabled and is now enabled
+			hwShaderVAO.enableAttribute(index);
+		} else {
+			// Attribute was enabled and is now disabled
+			hwShaderVAO.disableAttribute(index);
+		}
+	}
+
+	previousAttributeMask = currentAttributeMask;
+
 	for (int i = 0; i < totalAttribCount; i++) {
 		const auto& attrib = accel->attributeInfo[i];
-		
+
 		if (attrib.fixed) {
-			Helpers::panic("Fixed attribute!");
+			if ((currentAttributeMask & (1u << i)) == 0) {
+				glVertexAttrib4f(attrib.inputReg, attrib.fixedValue[0], attrib.fixedValue[1], attrib.fixedValue[2], attrib.fixedValue[3]);
+			}
 		} else {
-			if (attrib.isPadding) {
+			if (attrib.isPadding) [[unlikely]] {
 				continue;
 			}
-
-			glVertexAttribPointer(i, attrib.componentCount, attributeFormats[attrib.type], GL_FALSE, attrib.stride, reinterpret_cast<GLvoid*>(vertexBufferRes.buffer_offset + attrib.offset));
-			// TODO: Disable unused attributes as well
-			hwShaderVAO.enableAttribute(i);
-
+	
 			const u32 attributeSize = attrib.size * vertexCount;
 			std::memcpy(vertexData, attrib.data, attributeSize);
-			
+
 			vertexData += attributeSize;
+
+			glVertexAttribPointer(
+				attrib.inputReg, attrib.componentCount, attributeFormats[attrib.type], GL_FALSE, attrib.stride,
+				reinterpret_cast<GLvoid*>(vertexBufferRes.buffer_offset + attrib.offset)
+			);
 		}
 	}