Shadergen: Add clipping

wheremyfoodat · Jul 15, 2024 · 441aa23 · 441aa23
1 parent c02b382
commit 441aa23
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Showing 3 changed files with 32 additions and 10 deletions.
diff --git a/include/PICA/pica_frag_uniforms.hpp b/include/PICA/pica_frag_uniforms.hpp
@@ -16,5 +16,6 @@ namespace PICA {
 
 		alignas(16) vec4 constantColors[tevStageCount];
 		alignas(16) vec4 tevBufferColor;
+		alignas(16) vec4 clipCoords;
 	};
 }  // namespace PICA
diff --git a/src/core/PICA/shader_gen_glsl.cpp b/src/core/PICA/shader_gen_glsl.cpp
@@ -2,6 +2,18 @@
 using namespace PICA;
 using namespace PICA::ShaderGen;
 
+static constexpr const char* uniformDefinition = R"(
+	layout(std140) uniform FragmentUniforms {
+		int alphaReference;
+		float depthScale;
+		float depthOffset;
+
+		vec4 constantColors[6];
+		vec4 tevBufferColor;
+		vec4 clipCoords;
+	};
+)";
+
 std::string FragmentGenerator::getVertexShader(const PICARegs& regs) {
 	std::string ret = "";
 
@@ -20,6 +32,8 @@ std::string FragmentGenerator::getVertexShader(const PICARegs& regs) {
 		)";
 	}
 
+	ret += uniformDefinition;
+
 	ret += R"(
 		layout(location = 0) in vec4 a_coords;
 		layout(location = 1) in vec4 a_quaternion;
@@ -39,7 +53,9 @@ std::string FragmentGenerator::getVertexShader(const PICARegs& regs) {
 		out vec3 v_view;
 		out vec2 v_texcoord2;
 
-		//out float gl_ClipDistance[2];
+	#ifndef USING_GLES
+		out float gl_ClipDistance[2];
+	#endif
 
 		vec4 abgr8888ToVec4(uint abgr) {
 			const float scale = 1.0 / 255.0;
@@ -65,6 +81,11 @@ std::string FragmentGenerator::getVertexShader(const PICARegs& regs) {
 			v_normal = normalize(rotateVec3ByQuaternion(vec3(0.0, 0.0, 1.0), a_quaternion));
 			v_tangent = normalize(rotateVec3ByQuaternion(vec3(1.0, 0.0, 0.0), a_quaternion));
 			v_bitangent = normalize(rotateVec3ByQuaternion(vec3(0.0, 1.0, 0.0), a_quaternion));
+
+		#ifndef USING_GLES
+			gl_ClipDistance[0] = -a_coords.z;
+			gl_ClipDistance[1] = dot(clipCoords, a_coords);
+		#endif
 		}
 )";
 
@@ -109,17 +130,10 @@ std::string FragmentGenerator::generate(const PICARegs& regs) {
 #ifndef USING_GLES
 		uniform sampler1DArray u_tex_lighting_lut;
 #endif
-
-		layout(std140) uniform FragmentUniforms {
-			int alphaReference;
-			float depthScale;
-			float depthOffset;
-
-			vec4 constantColors[6];
-			vec4 tevBufferColor;
-		};
 	)";
 
+	ret += uniformDefinition;
+
 	// Emit main function for fragment shader
 	// When not initialized, source 13 is set to vec4(0.0) and 15 is set to the vertex colour
 	ret += R"(

diff --git a/src/core/renderer_gl/renderer_gl.cpp b/src/core/renderer_gl/renderer_gl.cpp
@@ -845,6 +845,13 @@ OpenGL::Program& RendererGL::getSpecializedShader() {
 	uniforms.depthScale = f24::fromRaw(regs[PICA::InternalRegs::DepthScale] & 0xffffff).toFloat32();
 	uniforms.depthOffset = f24::fromRaw(regs[PICA::InternalRegs::DepthOffset] & 0xffffff).toFloat32();
 
+	if (regs[InternalRegs::ClipEnable] & 1) {
+		uniforms.clipCoords[0] = f24::fromRaw(regs[PICA::InternalRegs::ClipData0] & 0xffffff).toFloat32();
+		uniforms.clipCoords[1] = f24::fromRaw(regs[PICA::InternalRegs::ClipData1] & 0xffffff).toFloat32();
+		uniforms.clipCoords[2] = f24::fromRaw(regs[PICA::InternalRegs::ClipData2] & 0xffffff).toFloat32();
+		uniforms.clipCoords[3] = f24::fromRaw(regs[PICA::InternalRegs::ClipData3] & 0xffffff).toFloat32();
+	}
+
 	// Set up the constant color for the 6 TEV stages
 	for (int i = 0; i < 6; i++) {
 		static constexpr std::array<u32, 6> ioBases = {