Create Shader class as a base for vertex and pixel shader

6 files changed, 212 insertions, 229 deletions

diff --git a/src/RenderBackend/OpenGL/DeviceFrame.cpp b/src/RenderBackend/OpenGL/DeviceFrame.cpp
index 9d60597..e79dfa1 100644
--- a/src/RenderBackend/OpenGL/DeviceFrame.cpp
+++ b/src/RenderBackend/OpenGL/DeviceFrame.cpp
@@ -28,9 +28,11 @@ namespace amalgine
     
     void DeviceFrame::draw()
     {
+        glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
         for(DeviceMemory *deviceMemory : buffers)
         {
             deviceMemory->draw();
         }
+        glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
     }
 }
diff --git a/src/RenderBackend/OpenGL/PixelShader.cpp b/src/RenderBackend/OpenGL/PixelShader.cpp
index f263513..e6006f2 100644
--- a/src/RenderBackend/OpenGL/PixelShader.cpp
+++ b/src/RenderBackend/OpenGL/PixelShader.cpp
@@ -1,103 +1,18 @@
 #include "../../../include/RenderBackend/OpenGL/PixelShader.hpp"
 #include "../../../include/RenderBackend/OpenGL/opengl.hpp"
 #include "../../../include/RenderBackend/OpenGL/CompiledShader.hpp"
-#include <cassert>
-
-using namespace std;
 
 namespace amalgine
 {
-    PixelShaderTooManyAttributes::PixelShaderTooManyAttributes(i32 maxPixelAttributes) : 
-        runtime_error(string("Attempting to define more than ") + to_string(maxPixelAttributes) + " pixel attributes")
-    {
-        
-    }
-    
-    PixelShaderAttributeAlreadyDefined::PixelShaderAttributeAlreadyDefined(const std::string &attributeName) : 
-        runtime_error(string("A pixel attribute with the name ") + attributeName + " has already been defined")
-    {
-        
-    }
-    
-    PixelShaderInvalidAttributeName::PixelShaderInvalidAttributeName(const std::string &attributeName) : 
-        runtime_error(string("Pixel attribute name ") + attributeName + " is invalid")
-    {
-        
-    }
-    
-    PixelShaderFunctionAlreadyDefined::PixelShaderFunctionAlreadyDefined(const std::string &funcName) : 
-        runtime_error(string("Pixel shader function already defined: ") + funcName)
+    PixelShader::PixelShader()
     {
-        
-    }
-    
-    PixelShader::PixelShader() : locationCounter(0), mainFuncDefined(false)
-    {
-        glGetIntegerv(GL_MAX_DRAW_BUFFERS, &maxPixelAttribs);
-        writeHeader("#version 330 core\n\n");
-    }
-    
-    const string& PixelShader::getOutputAttributeName(i32 attributeIndex)
-    {
-        assert(attributeIndex < pixelAttributeNames.size());
-        return pixelAttributeNames[attributeIndex].name;
+        glGetIntegerv(GL_MAX_DRAW_BUFFERS, &maxAttribs);
     }
-    
-    ShaderOutputVec4 PixelShader::defineOutputVec4(const std::string &name)
-    {
-        i32 attributeIndex = defineOutputVariable(name, "vec4");
-        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()))
-            throw PixelShaderInvalidAttributeName(variableName);
-        
-        if(locationCounter + 1 > maxPixelAttribs)
-            throw PixelShaderTooManyAttributes(maxPixelAttribs);
-        
-        if(pixelAttributes.find(variableName) != pixelAttributes.end())
-            throw PixelShaderAttributeAlreadyDefined(variableName);
-        
-        i32 attributeIndex = locationCounter;
-        pixelAttributes[variableName] = locationCounter;
-        writeHeader("out ");
-        writeHeader(typeName);
-        writeHeader(" ");
-        writeHeader(variableName);
-        writeHeader(";\n");
-        
-        ShaderAttribute shaderAttribute;
-        shaderAttribute.name = variableName;
-        shaderAttribute.typeName = typeName;
-        pixelAttributeNames.push_back(shaderAttribute);
-        ++locationCounter;
-        return attributeIndex;
-    }
-    
+
     void PixelShader::defineMain(PixelShaderMainFunc mainFunc)
     {
         if(mainFuncDefined)
-            throw PixelShaderFunctionAlreadyDefined("main");
+            throw ShaderFunctionAlreadyDefined("main");
         
         writeBody("void main() {\n");
         mainFunc();
@@ -105,38 +20,13 @@ namespace amalgine
         writeBody("}\n\n");
     }
     
-    void PixelShader::assign(const ShaderOutputVec4 &lhsVariable, const ShaderVec4 &rhsVariable)
-    {
-        writeBody(lhsVariable.getName());
-        writeBody(" = ");
-        writeBody(rhsVariable.getOutput());
-        writeBody(";\n");
-    }
-    
-    string PixelShader::build() const
-    {
-        std::string result;
-        result.reserve(header.size() + 2 + body.size());
-        result += header;
-        result += "\n";
-        result += body;
-        return result;
-    }
-    
-    void PixelShader::writeHeader(const string &code)
-    {
-        header += code;
-    }
-    
-    void PixelShader::writeBody(const string &code)
-    {
-        body += code;
-    }
-    
     Result<CompiledPixelShader*> PixelShader::compile()
     {
+        if(!mainFuncDefined)
+            return Result<CompiledPixelShader*>::Err("main function not defined (defineMain not called)");
+
         GLuint fragmentShaderId = glCreateShader(GL_FRAGMENT_SHADER);
-        string verterShaderSource = build();
+        std::string verterShaderSource = build();
         const char *verterShaderSourcePtr = verterShaderSource.c_str();
         printf("Vertex shader:\n%s\n", verterShaderSourcePtr);
         glShaderSource(fragmentShaderId, 1, &verterShaderSourcePtr, NULL);
@@ -144,12 +34,12 @@ namespace amalgine
         
         GLint status;
         glGetShaderiv(fragmentShaderId, GL_COMPILE_STATUS, &status);
-        string compileLog = getShaderCompileLog((u32)fragmentShaderId);
+        std::string compileLog = getShaderCompileLog((u32)fragmentShaderId);
         if(status == GL_TRUE)
         {
             if(!compileLog.empty())
                 printf("Pixel shader compile log:\n%s", compileLog.c_str());
-            return Result<CompiledPixelShader*>::Ok(new CompiledPixelShader(fragmentShaderId, move(pixelAttributes)));
+            return Result<CompiledPixelShader*>::Ok(new CompiledPixelShader(fragmentShaderId, move(inputAttributes)));
         }
         else
             return Result<CompiledPixelShader*>::Err(compileLog);
diff --git a/src/RenderBackend/OpenGL/Shader.cpp b/src/RenderBackend/OpenGL/Shader.cpp
new file mode 100644
index 0000000..fad1702
--- /dev/null
+++ b/src/RenderBackend/OpenGL/Shader.cpp
@@ -0,0 +1,169 @@
+#include "../../../include/RenderBackend/OpenGL/Shader.hpp"
+#include "../../../include/RenderBackend/OpenGL/opengl.hpp"
+#include "../../../include/RenderBackend/OpenGL/CompiledShader.hpp"
+#include <cassert>
+
+using namespace std;
+
+namespace amalgine {
+    ShaderTooManyAttributes::ShaderTooManyAttributes(i32 maxAttributes) : 
+        runtime_error(string("Attempting to define more than ") + to_string(maxAttributes) + " attributes")
+    {
+        
+    }
+    
+    ShaderAttributeAlreadyDefined::ShaderAttributeAlreadyDefined(const std::string &attributeName) : 
+        runtime_error(string("An attribute with the name ") + attributeName + " has already been defined")
+    {
+        
+    }
+    
+    ShaderInvalidAttributeName::ShaderInvalidAttributeName(const std::string &attributeName) : 
+        runtime_error(string("Attribute name ") + attributeName + " is invalid")
+    {
+        
+    }
+    
+    ShaderFunctionAlreadyDefined::ShaderFunctionAlreadyDefined(const std::string &funcName) : 
+        runtime_error(string("Shader function already defined: ") + funcName)
+    {
+        
+    }
+    
+    Shader::Shader() : inputLocationCounter(0), outputLocationCounter(0), mainFuncDefined(false)
+    {
+        writeHeader("#version 330 core\n\n");
+    }
+    
+    const string& Shader::getOutputAttributeName(i32 attributeIndex)
+    {
+        assert(attributeIndex < (i32)outputAttributeNames.size());
+        return outputAttributeNames[attributeIndex].name;
+    }
+
+    const string& Shader::getInputAttributeName(i32 attributeIndex) const
+    {
+        assert(attributeIndex < (i32)inputAttributeNames.size());
+        return inputAttributeNames[attributeIndex].name;
+    }
+    
+    AttributeType Shader::getInputAttributeType(i32 attributeIndex) const
+    {
+        assert(attributeIndex < (i32)inputAttributeNames.size());
+        return getAttributeTypeByName(inputAttributeNames[attributeIndex].typeName);
+    }
+    
+    ShaderOutputVec4 Shader::defineOutputVec4(const std::string &name)
+    {
+        i32 attributeIndex = defineOutputVariable(name, "vec4");
+        return ShaderOutputVec4(this, attributeIndex);
+    }
+    
+    // TODO: Generate warning if global variable is defined but not assigned to?
+    ShaderGlobalVec3 Shader::defineGlobalVec3(const std::string &name)
+    {
+        if(!isShaderVariableNameValid(name.c_str()))
+            throw ShaderInvalidAttributeName(name);
+        
+        if(uniforms.find(name) != uniforms.end())
+            throw ShaderAttributeAlreadyDefined(name);
+        
+        writeHeader("uniform vec3 ");
+        writeHeader(name);
+        writeHeader(";\n");
+        
+        ShaderGlobalVec3 globalVec(name);
+        uniforms[name] = globalVec.getVecObject();
+        return ShaderGlobalVec3(globalVec);
+    }
+    
+    i32 Shader::defineOutputVariable(const string &variableName, const char *typeName)
+    {
+        if(!isShaderVariableNameValid(variableName.c_str()))
+            throw ShaderInvalidAttributeName(variableName);
+        
+        if(outputLocationCounter + 1 > maxAttribs)
+            throw ShaderTooManyAttributes(maxAttribs);
+        
+        if(outputAttributes.find(variableName) != outputAttributes.end())
+            throw ShaderAttributeAlreadyDefined(variableName);
+        
+        i32 attributeIndex = outputLocationCounter;
+        outputAttributes[variableName] = outputLocationCounter;
+        writeHeader("out ");
+        writeHeader(typeName);
+        writeHeader(" ");
+        writeHeader(variableName);
+        writeHeader(";\n");
+        
+        ShaderAttribute shaderAttribute;
+        shaderAttribute.name = variableName;
+        shaderAttribute.typeName = typeName;
+        outputAttributeNames.push_back(shaderAttribute);
+        ++outputLocationCounter;
+        return attributeIndex;
+    }
+
+    ShaderInputVec2 Shader::defineInputVec2(const std::string &name)
+    {
+        i32 attributeIndex = defineInputVariable(name, "vec2");
+        return ShaderInputVec2(this, attributeIndex);
+    }
+
+    i32 Shader::defineInputVariable(const string &variableName, const char *typeName)
+    {
+        if(!isShaderVariableNameValid(variableName.c_str()))
+            throw ShaderInvalidAttributeName(variableName);
+        
+        if(inputLocationCounter + 1 > maxAttribs)
+            throw ShaderTooManyAttributes(maxAttribs);
+        
+        if(inputAttributes.find(variableName) != inputAttributes.end())
+            throw ShaderAttributeAlreadyDefined(variableName);
+        
+        i32 attributeIndex = inputLocationCounter;
+        inputAttributes[variableName] = inputLocationCounter;
+        ShaderAttribute shaderAttribute;
+        shaderAttribute.name = variableName;
+        shaderAttribute.typeName = typeName;
+        inputAttributeNames.push_back(shaderAttribute);
+        
+        writeHeader("layout(location = ");
+        writeHeader(to_string(inputLocationCounter));
+        ++inputLocationCounter;
+        writeHeader(") in ");
+        writeHeader(typeName);
+        writeHeader(" ");
+        writeHeader(variableName);
+        writeHeader(";\n");
+        return attributeIndex;
+    }
+    
+    void Shader::assign(const ShaderOutputVec4 &lhsVariable, const ShaderVec4 &rhsVariable)
+    {
+        writeBody(lhsVariable.getName());
+        writeBody(" = ");
+        writeBody(rhsVariable.getOutput());
+        writeBody(";\n");
+    }
+    
+    string Shader::build() const
+    {
+        std::string result;
+        result.reserve(header.size() + 2 + body.size());
+        result += header;
+        result += "\n";
+        result += body;
+        return result;
+    }
+    
+    void Shader::writeHeader(const string &code)
+    {
+        header += code;
+    }
+    
+    void Shader::writeBody(const string &code)
+    {
+        body += code;
+    }
+}
diff --git a/src/RenderBackend/OpenGL/ShaderVec.cpp b/src/RenderBackend/OpenGL/ShaderVec.cpp
index dd3bbe5..8897b84 100644
--- a/src/RenderBackend/OpenGL/ShaderVec.cpp
+++ b/src/RenderBackend/OpenGL/ShaderVec.cpp
@@ -1,6 +1,5 @@
 #include "../../../include/RenderBackend/OpenGL/ShaderVec.hpp"
-#include "../../../include/RenderBackend/OpenGL/VertexShader.hpp"
-#include "../../../include/RenderBackend/OpenGL/PixelShader.hpp"
+#include "../../../include/RenderBackend/OpenGL/Shader.hpp"
 #include "../../../include/RenderBackend/OpenGL/ShaderProgram.hpp"
 #include "../../../include/RenderBackend/OpenGL/opengl.hpp"
 #include <cstring>
@@ -16,7 +15,16 @@ namespace amalgine
         {
             return AttributeType::VEC2;
         }
+        else if(strncmp(attributeName, "vec3", 4) == 0)
+        {
+            return AttributeType::VEC3;
+        }
+        else if(strncmp(attributeName, "vec4", 4) == 0)
+        {
+            return AttributeType::VEC4;
+        }
         
+        assert(false);
         return AttributeType::NONE;
     }
     
@@ -28,13 +36,13 @@ namespace amalgine
     
     const string& ShaderInputVec2::getName() const
     {
-        return vertexShader->getInputAttributeName(attributeIndex);
+        return shader->getInputAttributeName(attributeIndex);
     }
     
     void ShaderInputVec2::setData(const DeviceMemory &data)
     {
         data.use();
-        AttributeType attributeType = vertexShader->getInputAttributeType(attributeIndex);
+        AttributeType attributeType = shader->getInputAttributeType(attributeIndex);
         switch(attributeType)
         {
             case AttributeType::VEC2:
@@ -51,11 +59,11 @@ namespace amalgine
     
     const string& ShaderOutputVec4::getName() const
     {
-        return pixelShader->getOutputAttributeName(attributeIndex);
+        return shader->getOutputAttributeName(attributeIndex);
     }
     
     void ShaderOutputVec4::operator=(const ShaderVec4 &shaderVec4)
     {
-        pixelShader->assign(*this, shaderVec4);
+        shader->assign(*this, shaderVec4);
     }
 }
diff --git a/src/RenderBackend/OpenGL/VertexShader.cpp b/src/RenderBackend/OpenGL/VertexShader.cpp
index ac9a159..19705b6 100644
--- a/src/RenderBackend/OpenGL/VertexShader.cpp
+++ b/src/RenderBackend/OpenGL/VertexShader.cpp
@@ -2,62 +2,16 @@
 #include "../../../include/RenderBackend/OpenGL/opengl.hpp"
 #include "../../../include/RenderBackend/OpenGL/CompiledShader.hpp"
 
-using namespace std;
-
-namespace amalgine
-{
-    VertexShaderTooManyAttributes::VertexShaderTooManyAttributes(i32 maxVertexAttributes) : 
-        runtime_error(string("Attempting to define more than ") + to_string(maxVertexAttributes) + " vertex attributes")
-    {
-        
-    }
-    
-    VertexShaderAttributeAlreadyDefined::VertexShaderAttributeAlreadyDefined(const std::string &attributeName) : 
-        runtime_error(string("A vertex attribute with the name ") + attributeName + " has already been defined")
-    {
-        
-    }
-    
-    VertexShaderInvalidAttributeName::VertexShaderInvalidAttributeName(const std::string &attributeName) : 
-        runtime_error(string("Vertex attribute name ") + attributeName + " is invalid")
-    {
-        
-    }
-    
-    VertexShaderFunctionAlreadyDefined::VertexShaderFunctionAlreadyDefined(const std::string &funcName) : 
-        runtime_error(string("Vertex shader function already defined: ") + funcName)
-    {
-        
-    }
-    
-    VertexShader::VertexShader() : locationCounter(0), mainFuncDefined(false)
-    {
-        glGetIntegerv(GL_MAX_VERTEX_ATTRIBS, &maxVertexAttribs);
-        writeHeader("#version 330 core\n\n");
-    }
-    
-    const string& VertexShader::getInputAttributeName(i32 attributeIndex) const
-    {
-        assert(attributeIndex < vertexAttributeNames.size());
-        return vertexAttributeNames[attributeIndex].name;
-    }
-    
-    AttributeType VertexShader::getInputAttributeType(i32 attributeIndex) const
+namespace amalgine {
+    VertexShader::VertexShader()
     {
-        assert(attributeIndex < vertexAttributeNames.size());
-        return getAttributeTypeByName(vertexAttributeNames[attributeIndex].typeName);
+        glGetIntegerv(GL_MAX_VERTEX_ATTRIBS, &maxAttribs);
     }
-    
-    ShaderInputVec2 VertexShader::defineInputVec2(const std::string &name)
-    {
-        i32 attributeIndex = defineInputVariable(name, "vec2");
-        return ShaderInputVec2(this, attributeIndex);
-    }
-    
+
     void VertexShader::defineMain(VertexShaderMainFunc mainFunc)
     {
         if(mainFuncDefined)
-            throw VertexShaderFunctionAlreadyDefined("main");
+            throw ShaderFunctionAlreadyDefined("main");
         
         writeBody("void main() {\n");
         ShaderVec4 glPosition = mainFunc();
@@ -66,60 +20,11 @@ namespace amalgine
         writeBody(glPosition.getOutput());
         writeBody(";\n}\n\n");
     }
-    
-    i32 VertexShader::defineInputVariable(const string &variableName, const char *typeName)
-    {
-        if(!isShaderVariableNameValid(variableName.c_str()))
-            throw VertexShaderInvalidAttributeName(variableName);
-        
-        if(locationCounter + 1 > maxVertexAttribs)
-            throw VertexShaderTooManyAttributes(maxVertexAttribs);
-        
-        if(vertexAttributes.find(variableName) != vertexAttributes.end())
-            throw VertexShaderAttributeAlreadyDefined(variableName);
-        
-        i32 attributeIndex = locationCounter;
-        vertexAttributes[variableName] = locationCounter;
-        ShaderAttribute shaderAttribute;
-        shaderAttribute.name = variableName;
-        shaderAttribute.typeName = typeName;
-        vertexAttributeNames.push_back(shaderAttribute);
-        
-        writeHeader("layout(location = ");
-        writeHeader(to_string(locationCounter));
-        ++locationCounter;
-        writeHeader(") in ");
-        writeHeader(typeName);
-        writeHeader(" ");
-        writeHeader(variableName);
-        writeHeader(";\n");
-        return attributeIndex;
-    }
-    
-    string VertexShader::build() const
-    {
-        std::string result;
-        result.reserve(header.size() + 2 + body.size());
-        result += header;
-        result += "\n";
-        result += body;
-        return result;
-    }
-    
-    void VertexShader::writeHeader(const string &code)
-    {
-        header += code;
-    }
-    
-    void VertexShader::writeBody(const string &code)
-    {
-        body += code;
-    }
-    
+
     Result<CompiledVertexShader*> VertexShader::compile()
     {
         GLuint vertexShaderId = glCreateShader(GL_VERTEX_SHADER);
-        string verterShaderSource = build();
+        std::string verterShaderSource = build();
         const char *verterShaderSourcePtr = verterShaderSource.c_str();
         printf("Vertex shader:\n%s\n", verterShaderSourcePtr);
         glShaderSource(vertexShaderId, 1, &verterShaderSourcePtr, NULL);
@@ -127,7 +32,7 @@ namespace amalgine
         
         GLint status;
         glGetShaderiv(vertexShaderId, GL_COMPILE_STATUS, &status);
-        string compileLog = getShaderCompileLog((u32)vertexShaderId);
+        std::string compileLog = getShaderCompileLog((u32)vertexShaderId);
         if(status == GL_TRUE)
         {
             if(!compileLog.empty())
diff --git a/src/main.cpp b/src/main.cpp
index ada75e2..24ef4f8 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -133,7 +133,16 @@ CompiledVertexShader* createVertexShader(const DeviceMemory &inputData)
     VertexShader vertexShader;
     ShaderInputVec2 inputPosition = vertexShader.defineInputVec2("position");
     inputPosition.setData(inputData);
+    #if 0
+    ShaderGlobalMat4x4 model = vertexShader.defineGlobalMat4x4("model");
+    ShaderGlobalMat4x4 view = vertexShader.defineGlobalMat4x4("view");
+    ShaderGlobalMat4x4 proj = vertexShader.defineGlobalMat4x4("proj");
     
+    vertexShader.defineMain([&inputPosition, &model, &view, &proj]()
+    {
+        return proj * view * model * ShaderVec4(inputPosition, 0.0f, 1.0f);
+    });
+    #endif
     vertexShader.defineMain([&inputPosition]()
     {
         return ShaderVec4(inputPosition, 0.0f, 1.0f);