[spline/bezier]Get rid of wasted if-checks at Graphics Processors.

LunaMoo · Oct 7, 2018 · 103d180 · 103d180
1 parent 41d6c3c
commit 103d180
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Showing 3 changed files with 6 additions and 9 deletions.
diff --git a/GPU/Directx9/VertexShaderGeneratorDX9.cpp b/GPU/Directx9/VertexShaderGeneratorDX9.cpp
@@ -287,11 +287,10 @@ void GenerateVertexShaderHLSL(const VShaderID &id, char *buffer, ShaderLanguage
 			// Define 3 types float2, float3, float4
 			WRITE(p, "float%d tess_sample(in float%d points[16], float4 weights_u, float4 weights_v) {\n", i, i);
 			WRITE(p, "  float%d pos = float%d(%s);\n", i, i, init[i - 2]);
+			WRITE(p, "  int idx = 0;\n");
 			WRITE(p, "  for (int v = 0; v < 4; ++v) {\n");
 			WRITE(p, "    for (int u = 0; u < 4; ++u) {\n");
-			WRITE(p, "      float f = weights_u[u] * weights_v[v];\n");
-			WRITE(p, "      if (f != 0.0)\n");
-			WRITE(p, "        pos = pos + f * points[v * 4 + u];\n");
+			WRITE(p, "      pos += weights_u[u] * weights_v[v] * points[idx++];\n");
 			WRITE(p, "    }\n");
 			WRITE(p, "  }\n");
 			WRITE(p, "  return pos;\n");

diff --git a/GPU/GLES/VertexShaderGeneratorGLES.cpp b/GPU/GLES/VertexShaderGeneratorGLES.cpp
@@ -390,11 +390,10 @@ void GenerateVertexShader(const VShaderID &id, char *buffer, uint32_t *attrMask,
 			// Define 3 types vec2, vec3, vec4
 			WRITE(p, "vec%d tess_sample(in vec%d points[16], vec4 weights_u, vec4 weights_v) {\n", i, i);
 			WRITE(p, "  vec%d pos = vec%d(0.0);\n", i, i);
+			WRITE(p, "  int idx = 0;\n");
 			WRITE(p, "  for (int v = 0; v < 4; ++v) {\n");
 			WRITE(p, "    for (int u = 0; u < 4; ++u) {\n");
-			WRITE(p, "      float f = weights_u[u] * weights_v[v];\n");
-			WRITE(p, "      if (f != 0.0)\n");
-			WRITE(p, "        pos += f * points[v * 4 + u];\n");
+			WRITE(p, "      pos += weights_u[u] * weights_v[v] * points[idx++];\n");
 			WRITE(p, "    }\n");
 			WRITE(p, "  }\n");
 			WRITE(p, "  return pos;\n");

diff --git a/GPU/Vulkan/VertexShaderGeneratorVulkan.cpp b/GPU/Vulkan/VertexShaderGeneratorVulkan.cpp
@@ -239,11 +239,10 @@ bool GenerateVulkanGLSLVertexShader(const VShaderID &id, char *buffer) {
 			// Define 3 types vec2, vec3, vec4
 			WRITE(p, "vec%d tess_sample(in vec%d points[16], vec4 weights_u, vec4 weights_v) {\n", i, i);
 			WRITE(p, "  vec%d pos = vec%d(0.0);\n", i, i);
+			WRITE(p, "  int idx = 0;\n");
 			WRITE(p, "  for (int v = 0; v < 4; ++v) {\n");
 			WRITE(p, "    for (int u = 0; u < 4; ++u) {\n");
-			WRITE(p, "      float f = weights_u[u] * weights_v[v];\n");
-			WRITE(p, "      if (f != 0.0)\n");
-			WRITE(p, "        pos += f * points[v * 4 + u];\n");
+			WRITE(p, "      pos += weights_u[u] * weights_v[v] * points[idx++];\n");
 			WRITE(p, "    }\n");
 			WRITE(p, "  }\n");
 			WRITE(p, "  return pos;\n");