參考資訊:
https://wiki.libsdl.org/FrontPage
https://kaprikawn.wordpress.com/2018/01/07/learning-to-learn-opengl-es-2-0-part-01/
http://www.subdude-site.com/WebPages_Local/RefInfo/Computer/Linux/LinuxGuidesOfOthers/linuxProgrammingGuides/pdfs/MobileDeviceProgramming/MOBogl_OpenGL_ES_2-0_ProgrammingGuide_2009_457pgs.pdf
main.c
#include <stdio.h> #include <stdlib.h> #include <SDL2/SDL.h> #include <GLES2/gl2.h> const char *vShaderSrc = "void main(void){}"; const char *fShaderSrc = "void main(void){}"; int main(int argc, char **argv) { SDL_Window *window = NULL; SDL_Renderer *render = NULL; SDL_GLContext context = {0}; SDL_Init(SDL_INIT_VIDEO); SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_ES); SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 2); SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 0); window = SDL_CreateWindow("main", 0, 0, 320, 240, SDL_WINDOW_OPENGL); render = SDL_CreateRenderer(window, -1, SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC); context = SDL_GL_CreateContext(window); GLuint vShader = 0; GLuint fShader = 0; GLuint pObject = 0; vShader = glCreateShader(GL_VERTEX_SHADER); glShaderSource(vShader, 1, &vShaderSrc, NULL); glCompileShader(vShader); fShader = glCreateShader(GL_FRAGMENT_SHADER); glShaderSource(fShader, 1, &fShaderSrc, NULL); glCompileShader(fShader); pObject = glCreateProgram(); glAttachShader(pObject, vShader); glAttachShader(pObject, fShader); glLinkProgram(pObject); glUseProgram(pObject); glViewport(0, 0, 320, 240); glClearColor(1.0f, 0.0f, 0.0f, 1.0f); glClear(GL_COLOR_BUFFER_BIT); SDL_GL_SwapWindow(window); SDL_Delay(3000); SDL_DestroyWindow(window); SDL_DestroyRenderer(render); SDL_GL_DeleteContext(context); SDL_Quit(); return 0; }
編譯、執行
$ gcc main.c -lSDL2 -lGLESv2 -o main $ ./main