Add uniform (shader global variable)

1 files changed, 18 insertions, 0 deletions

diff --git a/src/RenderBackend/OpenGL/PixelShader.cpp b/src/RenderBackend/OpenGL/PixelShader.cpp
index 8aa4d9a..f263513 100644
--- a/src/RenderBackend/OpenGL/PixelShader.cpp
+++ b/src/RenderBackend/OpenGL/PixelShader.cpp
@@ -49,6 +49,24 @@ namespace amalgine
         return ShaderOutputVec4(this, attributeIndex);
     }
     
+    // TODO: Generate warning if global variable is defined but not assigned to?
+    ShaderGlobalVec3 PixelShader::defineGlobalVec3(const std::string &name)
+    {
+        if(!isShaderVariableNameValid(name.c_str()))
+            throw PixelShaderInvalidAttributeName(name);
+        
+        if(globalAttributes.find(name) != globalAttributes.end())
+            throw PixelShaderAttributeAlreadyDefined(name);
+        
+        writeHeader("uniform vec3 ");
+        writeHeader(name);
+        writeHeader(";\n");
+        
+        ShaderGlobalVec3 globalVec(name);
+        globalAttributes[name] = globalVec.getVecObject();
+        return ShaderGlobalVec3(globalVec);
+    }
+    
     i32 PixelShader::defineOutputVariable(const string &variableName, const char *typeName)
     {
         if(!isShaderVariableNameValid(variableName.c_str()))