为什么我在emcripten使用 "#version 300 es "得到 "不支持的shader版本"？

Question

我不知道为什么我在使用 "#version 300 es "时得到 "unsupported shader version "的错误信息。#version 300 es 在我的顶点着色器中使用最新的EMScripten 1.39。有了 #version 100 它工作得很好。

const GLchar* vertex_shader_code[] = {
      "#version 300 es\n"
      "precision mediump float; \n"

      "void main() { \n"
           "gl_Position = vec4(0.0, 0.0, 0.0, 1.0); \n"
      "} \n"
};

SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3);
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 0);

SDL_version compiled;
SDL_version linked;

SDL_VERSION(&compiled);
SDL_GetVersion(&linked);
printf("Compiled SDL version: %d.%d.%d\n", compiled.major, compiled.minor, compiled.patch);
printf("Linked SDL version: %d.%d.%d\n", linked.major, linked.minor, linked.patch);

SDL_Init(SDL_INIT_VIDEO);
SDL_CreateWindowAndRenderer(CANVAS_WIDTH, CANVAS_HEIGHT, 0, &window, &renderer);
SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255);
SDL_RenderClear(renderer);

GLuint vertex_shader = glCreateShader(GL_VERTEX_SHADER);
glShaderSource(vertex_shader, 1, vertex_shader_code, 0);
glCompileShader(vertex_shader);

auto compile_success = 0;
auto compile_info_lenght = 0;
glGetShaderiv(vertex_shader, GL_COMPILE_STATUS, &compile_success);

if(compile_success == GL_FALSE) {
   glGetShaderiv(vertex_shader, GL_INFO_LOG_LENGTH, &compile_info_lenght);
   std::string vertex_shader_log(compile_info_lenght, ' ');

   glGetShaderInfoLog(vertex_shader, compile_info_lenght, NULL, &vertex_shader_log[0]);
   int n = vertex_shader_log.length();
   char char_array[n + 1];
   strcpy(char_array, vertex_shader_log.c_str());
   printf("%s\n", char_array);

   glDeleteShader(vertex_shader);
   return 0;
}

我使用的是 emcc -s main.cpp -o index.html --shell-file shell.html -s USE_SDL=2 -s FULL_ES3=1

留言。

Compiled SDL version: 2.0.9
Linked SDL version: 2.0.9
ERROR: unsupported shader version

我做错了什么？

Answer 1

对于有同样问题的人，解决办法是SDL_WINDOW_OPENGL。

SDL_CreateWindowAndRenderer(CANVAS_WIDTH, CANVAS_HEIGHT, SDL_WINDOW_OPENGL, &window, &renderer);