103 lines
2.1 KiB
C++
103 lines
2.1 KiB
C++
#include "main.h"
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#include <iostream>
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HGLRC hRC;
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// Declare a global callback variable
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ErrorCallback glErrorCallback = nullptr;
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bool _HAS_VIEWPORT_BEEN_SETUP = false;
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unsigned int VIEWPORT_WIDTH = 0;
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unsigned int VIEWPORT_HEIGHT = 0;
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// Function to set the error callback
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DLL_API void SetGLErrorCallback(ErrorCallback callback)
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{
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glErrorCallback = callback;
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}
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DLL_API void InitializeOpenGL(HWND hWnd)
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{
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HDC hdc = GetDC(hWnd);
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// Set pixel format
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PIXELFORMATDESCRIPTOR pfd;
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ZeroMemory(&pfd, sizeof(pfd));
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pfd.nSize = sizeof(pfd);
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pfd.nVersion = 1;
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pfd.dwFlags = PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER;
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pfd.iPixelType = PFD_TYPE_RGBA;
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pfd.cColorBits = 32;
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pfd.cDepthBits = 24;
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pfd.cStencilBits = 8;
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int pixelFormat = ChoosePixelFormat(hdc, &pfd);
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SetPixelFormat(hdc, pixelFormat, &pfd);
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hRC = wglCreateContext(hdc);
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wglMakeCurrent(hdc, hRC);
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GLenum err = glewInit();
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if (err != GLEW_OK) {
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// Handle GLEW initialization error
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if (glErrorCallback)
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{
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const char* errorMessage = reinterpret_cast<const char*>(glewGetErrorString(err));
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glErrorCallback(err, errorMessage);
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}
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wglMakeCurrent(NULL, NULL);
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wglDeleteContext(hRC);
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ReleaseDC(hWnd, hdc);
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return;
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}
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}
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DLL_API void RenderFrame()
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{
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if (!_HAS_VIEWPORT_BEEN_SETUP)
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{
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return;
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}
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glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
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glClear(GL_COLOR_BUFFER_BIT);
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glViewport(0, 0, VIEWPORT_WIDTH, VIEWPORT_HEIGHT);
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// Set up vertex data
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float vertices[] = {
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0.0f, 0.5f, 0.0f,
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0.5f, -0.5f, 0.0f,
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-0.5f, -0.5f, 0.0f
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};
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unsigned int vao;
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glGenVertexArrays(1, &vao);
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glBindVertexArray(vao);
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unsigned int vbo;
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glGenBuffers(1, &vbo);
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glBindBuffer(GL_ARRAY_BUFFER, vbo);
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glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
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glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 2 * sizeof(float), (void*)0);
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glDrawArrays(GL_TRIANGLES, 0, 3);
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glDeleteBuffers(1, &vbo);
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glDeleteVertexArrays(1, &vao);
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SwapBuffers(wglGetCurrentDC());
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}
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DLL_API void SetupViewport(int width, int height)
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{
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VIEWPORT_WIDTH = width;
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VIEWPORT_HEIGHT = height;
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_HAS_VIEWPORT_BEEN_SETUP = true;
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} |