掌機 - Miyoo A30 - C/C++ - SDL v2.0 - OpenGL ES 2.0 - Fill Color

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_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);
    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(30000);
 
    SDL_DestroyWindow(window);
    SDL_GL_DeleteContext(context);
    SDL_Quit();
    return 0;
}

編譯、執行

$ /opt/a30/bin/arm-linux-gcc \
    -I/opt/a30/arm-a30-linux-gnueabihf/sysroot/usr/include/SDL2 \
    -lSDL2 -lSDL2_gfx -lSDL2_image -lSDL2_ttf -lSDL2_mixer \
    -lGLESv2 main.c -o main

/mnt/SDCARD# export LD_LIBRARY_PATH=.:/config/lib:/customer/lib:/usr/miyoo/lib
/mnt/SDCARD# ./main