From fbd2e5d9a802db4fb5e056705ec599ac423e09be Mon Sep 17 00:00:00 2001
From: dec05eba <dec05eba@protonmail.com>
Date: Sun, 27 Oct 2019 01:30:34 +0200
Subject: Create Shader class as a base for vertex and pixel shader

---
 src/RenderBackend/OpenGL/PixelShader.cpp | 130 +++----------------------------
 1 file changed, 10 insertions(+), 120 deletions(-)

(limited to 'src/RenderBackend/OpenGL/PixelShader.cpp')

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);
-- 
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