From ff4daae11db0ab811cac66e262d289a4107bba4a Mon Sep 17 00:00:00 2001
From: dec05eba <dec05eba@protonmail.com>
Date: Wed, 27 Dec 2017 23:48:41 +0100
Subject: Add uniform (shader global variable)

---
 include/RenderBackend/OpenGL/PixelShader.hpp   |  2 +
 include/RenderBackend/OpenGL/ShaderProgram.hpp |  8 ++++
 include/RenderBackend/OpenGL/ShaderVec.hpp     | 56 +++++++++++++++++++++++++-
 3 files changed, 65 insertions(+), 1 deletion(-)

(limited to 'include/RenderBackend')

diff --git a/include/RenderBackend/OpenGL/PixelShader.hpp b/include/RenderBackend/OpenGL/PixelShader.hpp
index e025c6f..6794fb1 100644
--- a/include/RenderBackend/OpenGL/PixelShader.hpp
+++ b/include/RenderBackend/OpenGL/PixelShader.hpp
@@ -54,6 +54,7 @@ namespace amalgine
         
         const std::string& getOutputAttributeName(i32 attributeIndex);
         ShaderOutputVec4 defineOutputVec4(const std::string &name);
+        ShaderGlobalVec3 defineGlobalVec3(const std::string &name);
         
         void defineMain(PixelShaderMainFunc mainFunc);
         void assign(const ShaderOutputVec4 &lhsVariable, const ShaderVec4 &rhsVariable);
@@ -75,6 +76,7 @@ namespace amalgine
         i32 maxPixelAttribs; // Could make this static
         std::unordered_map<std::string, i32> pixelAttributes;
         std::vector<ShaderAttribute> pixelAttributeNames;
+        std::unordered_map<std::string, ShaderGlobalVec> globalAttributes;
         bool mainFuncDefined;
     };
 }
diff --git a/include/RenderBackend/OpenGL/ShaderProgram.hpp b/include/RenderBackend/OpenGL/ShaderProgram.hpp
index 2b1c5b4..c8740f8 100644
--- a/include/RenderBackend/OpenGL/ShaderProgram.hpp
+++ b/include/RenderBackend/OpenGL/ShaderProgram.hpp
@@ -3,6 +3,7 @@
 #include "../../Result.hpp"
 #include "../../types.hpp"
 #include "../../utils.hpp"
+#include "ShaderVec.hpp"
 #include <vector>
 #include <stdexcept>
 
@@ -19,6 +20,12 @@ namespace amalgine
         ShaderProgramUsedBeforeBuilt();
     };
     
+    class ShaderProgramNonExistingGlobalVariable : public std::runtime_error
+    {
+    public:
+        ShaderProgramNonExistingGlobalVariable(const char *variableName);
+    };
+    
     class ShaderProgram
     {
         DISABLE_COPY(ShaderProgram)
@@ -31,6 +38,7 @@ namespace amalgine
         
         Result<bool> build();
         void use();
+        ShaderProgramGlobalVec3 getGlobalVec3(const char *name);
     private:
         u32 shaderProgramId;
         bool built;
diff --git a/include/RenderBackend/OpenGL/ShaderVec.hpp b/include/RenderBackend/OpenGL/ShaderVec.hpp
index a5163ba..7c14af1 100644
--- a/include/RenderBackend/OpenGL/ShaderVec.hpp
+++ b/include/RenderBackend/OpenGL/ShaderVec.hpp
@@ -8,15 +8,60 @@ namespace amalgine
 {
     class VertexShader;
     class PixelShader;
+    class ShaderProgram;
     
     enum class AttributeType
     {
         NONE,
-        VEC2
+        VEC2,
+        VEC3,
+        VEC4
     };
     
     AttributeType getAttributeTypeByName(const char *attributeName);
     
+    class ShaderGlobalVec
+    {
+        friend class VertexShader;
+        friend class PixelShader;
+        friend class ShaderGlobalVec3;
+    public:
+        ShaderGlobalVec() : attributeType(AttributeType::NONE) {}
+        const std::string& getName() const { return name; }
+        AttributeType getAttributeType() const { return attributeType; }
+    protected:
+        ShaderGlobalVec(const std::string &_name, AttributeType _attributeType) : name(_name), attributeType(_attributeType) {}
+    private:
+        std::string name;
+        AttributeType attributeType;
+    };
+    
+    class ShaderGlobalVec3
+    {
+        friend class VertexShader;
+        friend class PixelShader;
+    public:
+        const std::string& getName() const { return globalVec.getName(); }
+        AttributeType getAttributeType() const { return globalVec.getAttributeType(); }
+        ShaderGlobalVec getVecObject() const { return globalVec; }
+    private:
+        ShaderGlobalVec3(const std::string &_name) : globalVec(_name, AttributeType::VEC3) {}
+    private:
+        ShaderGlobalVec globalVec;
+    };
+    
+    class ShaderProgramGlobalVec3
+    {
+        friend class ShaderProgram;
+    public:
+        void set(f32 x = 0.0f, f32 y = 0.0f, f32 z = 0.0f);
+    private:
+        ShaderProgramGlobalVec3(ShaderProgram *_shaderProgram, i32 _uniformId) : shaderProgram(_shaderProgram), uniformId(_uniformId){}
+    private:
+        ShaderProgram *shaderProgram;
+        i32 uniformId;
+    };
+    
     class ShaderInputVec2
     {
         friend class VertexShader;
@@ -62,6 +107,15 @@ namespace amalgine
             result += ")";
         }
         
+        ShaderVec4(const ShaderGlobalVec3 &vec3, f32 w = 0.0f)
+        {
+            result = "vec4(";
+            result += vec3.getName();
+            result += ", ";
+            result += std::to_string(w);
+            result += ")";
+        }
+        
         const std::string& getOutput() const
         {
             return result;
-- 
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