First commit

src/resource/shader.cpp

@@ -0,0 +1,79 @@
+#include "shader.h"
+
+#include <iostream>
+
+namespace game::resource
+{
+  Shader::Shader(const char* vertex, const char* fragment)
+  {
+    id = glCreateProgram();
+
+    auto compile = [&](const GLuint& shaderHandle, const char* text, const char* stage)
+    {
+      int isCompile{};
+      glShaderSource(shaderHandle, 1, &text, nullptr);
+      glCompileShader(shaderHandle);
+      glGetShaderiv(shaderHandle, GL_COMPILE_STATUS, &isCompile);
+      if (!isCompile)
+      {
+        GLint logLength = 0;
+        glGetShaderiv(shaderHandle, GL_INFO_LOG_LENGTH, &logLength);
+        std::string log(logLength, '\0');
+        if (logLength > 0) glGetShaderInfoLog(shaderHandle, logLength, nullptr, log.data());
+        std::cout << "Failed to compile shader: " << log << '\n';
+        return false;
+      }
+      return true;
+    };
+
+    auto vertexHandle = glCreateShader(GL_VERTEX_SHADER);
+    auto fragmentHandle = glCreateShader(GL_FRAGMENT_SHADER);
+
+    if (!(compile(vertexHandle, vertex, "vertex") && compile(fragmentHandle, fragment, "fragment")))
+    {
+      glDeleteShader(vertexHandle);
+      glDeleteShader(fragmentHandle);
+      glDeleteProgram(id);
+      id = 0;
+      return;
+    }
+
+    glAttachShader(id, vertexHandle);
+    glAttachShader(id, fragmentHandle);
+
+    glLinkProgram(id);
+
+    auto isLinked = GL_FALSE;
+    glGetProgramiv(id, GL_LINK_STATUS, &isLinked);
+
+    if (!isLinked)
+    {
+      glDeleteProgram(id);
+      id = 0;
+      std::cout << "Failed to link shader: " << id << "\n";
+    }
+    else
+      std::cout << "Initialized shader: " << id << "\n";
+
+    glDeleteShader(vertexHandle);
+    glDeleteShader(fragmentHandle);
+  }
+
+  Shader::~Shader()
+  {
+    if (is_valid()) glDeleteProgram(id);
+  }
+
+  bool Shader::is_valid() const { return id != 0; }
+
+  Shader& Shader::operator=(Shader&& other) noexcept
+  {
+    if (this != &other)
+    {
+      if (is_valid()) glDeleteProgram(id);
+      id = other.id;
+      other.id = 0;
+    }
+    return *this;
+  }
+}