[spline/bezier]Reduce multiplications in the shaders from 16 to 4.

hrydgard · Oct 7, 2018 · de5975f · de5975f
1 parent 103d180
commit de5975f
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Showing 3 changed files with 6 additions and 3 deletions.
diff --git a/GPU/Directx9/VertexShaderGeneratorDX9.cpp b/GPU/Directx9/VertexShaderGeneratorDX9.cpp
@@ -289,8 +289,9 @@ void GenerateVertexShaderHLSL(const VShaderID &id, char *buffer, ShaderLanguage
 			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, "    float4 w = weights_u * weights_v[v];\n");
 			WRITE(p, "    for (int u = 0; u < 4; ++u) {\n");
-			WRITE(p, "      pos += weights_u[u] * weights_v[v] * points[idx++];\n");
+			WRITE(p, "      pos += w[u] * 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
@@ -392,8 +392,9 @@ void GenerateVertexShader(const VShaderID &id, char *buffer, uint32_t *attrMask,
 			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, "    vec4 w = weights_u * weights_v[v];\n");
 			WRITE(p, "    for (int u = 0; u < 4; ++u) {\n");
-			WRITE(p, "      pos += weights_u[u] * weights_v[v] * points[idx++];\n");
+			WRITE(p, "      pos += w[u] * 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
@@ -241,8 +241,9 @@ bool GenerateVulkanGLSLVertexShader(const VShaderID &id, char *buffer) {
 			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, "    vec4 w = weights_u * weights_v[v];\n");
 			WRITE(p, "    for (int u = 0; u < 4; ++u) {\n");
-			WRITE(p, "      pos += weights_u[u] * weights_v[v] * points[idx++];\n");
+			WRITE(p, "      pos += w[u] * points[idx++];\n");
 			WRITE(p, "    }\n");
 			WRITE(p, "  }\n");
 			WRITE(p, "  return pos;\n");