Add OpenGLShader class

- Created OpenGLShader class for shader compilation
- Supports compiling from file or source code
- Provides uniform setting methods (SetInt, SetFloat, SetVec3, SetMat4)
- Integrated with GLAD for OpenGL function loading

tests/OpenGL/CMakeLists.txt

@@ -25,6 +25,7 @@ add_executable(
   XCRender
   main.cpp
   OpenGLDevice.cpp
+  OpenGLShader.cpp
   ./package/src/glad.c
 )
 

tests/OpenGL/OpenGLShader.cpp

@@ -0,0 +1,130 @@
+#define GLFW_INCLUDE_NONE
+#include "OpenGLShader.h"
+#include <glad/glad.h>
+#include <GLFW/glfw3.h>
+#include <fstream>
+#include <sstream>
+#include <iostream>
+
+namespace XCEngine {
+namespace RHI {
+
+OpenGLShader::OpenGLShader()
+    : m_program(0) {
+}
+
+OpenGLShader::~OpenGLShader() {
+    Shutdown();
+}
+
+bool OpenGLShader::CompileFromFile(const char* vertexPath, const char* fragmentPath) {
+    std::string vertexCode, fragmentCode;
+    std::ifstream vShaderFile(vertexPath), fShaderFile(fragmentPath);
+    
+    if (!vShaderFile.is_open() || !fShaderFile.is_open()) {
+        return false;
+    }
+    
+    std::stringstream vShaderStream, fShaderStream;
+    vShaderStream << vShaderFile.rdbuf();
+    fShaderStream << fShaderFile.rdbuf();
+    vShaderFile.close();
+    fShaderFile.close();
+    
+    vertexCode = vShaderStream.str();
+    fragmentCode = fShaderStream.str();
+    
+    return Compile(vertexCode.c_str(), fragmentCode.c_str());
+}
+
+bool OpenGLShader::Compile(const char* vertexSource, const char* fragmentSource) {
+    unsigned int vertex, fragment;
+    
+    vertex = glCreateShader(GL_VERTEX_SHADER);
+    glShaderSource(vertex, 1, &vertexSource, NULL);
+    glCompileShader(vertex);
+    if (!CheckCompileErrors(vertex, "VERTEX")) {
+        return false;
+    }
+    
+    fragment = glCreateShader(GL_FRAGMENT_SHADER);
+    glShaderSource(fragment, 1, &fragmentSource, NULL);
+    glCompileShader(fragment);
+    if (!CheckCompileErrors(fragment, "FRAGMENT")) {
+        return false;
+    }
+    
+    m_program = glCreateProgram();
+    glAttachShader(m_program, vertex);
+    glAttachShader(m_program, fragment);
+    glLinkProgram(m_program);
+    
+    if (!CheckLinkErrors(m_program)) {
+        return false;
+    }
+    
+    glDeleteShader(vertex);
+    glDeleteShader(fragment);
+    
+    return true;
+}
+
+void OpenGLShader::Shutdown() {
+    if (m_program) {
+        glDeleteProgram(m_program);
+        m_program = 0;
+    }
+}
+
+void OpenGLShader::Use() const {
+    glUseProgram(m_program);
+}
+
+void OpenGLShader::SetInt(const std::string& name, int value) const {
+    glUniform1i(glGetUniformLocation(m_program, name.c_str()), value);
+}
+
+void OpenGLShader::SetFloat(const std::string& name, float value) const {
+    glUniform1f(glGetUniformLocation(m_program, name.c_str()), value);
+}
+
+void OpenGLShader::SetVec3(const std::string& name, float x, float y, float z) const {
+    glUniform3f(glGetUniformLocation(m_program, name.c_str()), x, y, z);
+}
+
+void OpenGLShader::SetVec3(const std::string& name, const float* values) const {
+    glUniform3fv(glGetUniformLocation(m_program, name.c_str()), 1, values);
+}
+
+void OpenGLShader::SetMat4(const std::string& name, const float* value) const {
+    glUniformMatrix4fv(glGetUniformLocation(m_program, name.c_str()), 1, GL_FALSE, value);
+}
+
+bool OpenGLShader::CheckCompileErrors(unsigned int shader, const char* type) {
+    int success;
+    char infoLog[1024];
+    
+    glGetShaderiv(shader, GL_COMPILE_STATUS, &success);
+    if (!success) {
+        glGetShaderInfoLog(shader, 1024, NULL, infoLog);
+        std::cout << "ERROR::SHADER_COMPILATION_ERROR: " << type << "\n" << infoLog << std::endl;
+        return false;
+    }
+    return true;
+}
+
+bool OpenGLShader::CheckLinkErrors(unsigned int program) {
+    int success;
+    char infoLog[1024];
+    
+    glGetProgramiv(program, GL_LINK_STATUS, &success);
+    if (!success) {
+        glGetProgramInfoLog(program, 1024, NULL, infoLog);
+        std::cout << "ERROR::PROGRAM_LINKING_ERROR\n" << infoLog << std::endl;
+        return false;
+    }
+    return true;
+}
+
+} // namespace RHI
+} // namespace XCEngine

tests/OpenGL/OpenGLShader.h

@@ -0,0 +1,34 @@
+#pragma once
+
+#include <string>
+#include <GLFW/glfw3.h>
+
+namespace XCEngine {
+namespace RHI {
+
+class OpenGLShader {
+public:
+    OpenGLShader();
+    ~OpenGLShader();
+
+    bool CompileFromFile(const char* vertexPath, const char* fragmentPath);
+    bool Compile(const char* vertexSource, const char* fragmentSource);
+    void Shutdown();
+
+    void Use() const;
+    void SetInt(const std::string& name, int value) const;
+    void SetFloat(const std::string& name, float value) const;
+    void SetVec3(const std::string& name, float x, float y, float z) const;
+    void SetVec3(const std::string& name, const float* values) const;
+    void SetMat4(const std::string& name, const float* value) const;
+
+    unsigned int GetID() const { return m_program; }
+
+private:
+    unsigned int m_program;
+    bool CheckCompileErrors(unsigned int shader, const char* type);
+    bool CheckLinkErrors(unsigned int program);
+};
+
+} // namespace RHI
+} // namespace XCEngine