Function main

test/browser/webgl_sampler_layout_binding.c:61–158

}

int main(int argc, char *argv[])
{
  EmscriptenWebGLContextAttributes attr;
  emscripten_webgl_init_context_attributes(&attr);
  EMSCRIPTEN_WEBGL_CONTEXT_HANDLE ctx = emscripten_webgl_create_context("#canvas", &attr);
  emscripten_webgl_make_context_current(ctx);

  GLuint vs = CompileShader(GL_VERTEX_SHADER,
    "attribute vec4 pos;\n"
    "varying vec2 pUv;\n"
    "void main() { pUv = pos.xy; gl_Position = pos; }");

  GLuint ps = CompileShader(GL_FRAGMENT_SHADER,
    "precision lowp float;\n"
    "layout(binding = 4) uniform sampler2D tex;\n"
    "varying vec2 pUv;\n"
    "void main() { gl_FragColor = texture2D(tex, pUv); }");

  GLuint program = CreateProgram(vs, ps);
  glUseProgram(program);

  GLuint tex[2];
  glGenTextures(2, tex);

  glActiveTexture(GL_TEXTURE0 + 4);
  glBindTexture(GL_TEXTURE_2D, tex[0]);
  uint32_t color[4] = {
    0xFF0000FF,
    0xFF00FF00,
    0xFFFF0000,
    0xFFFFFFFF,
  };
  glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 2, 2, 0, GL_RGBA, GL_UNSIGNED_BYTE, color);
  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);

  glActiveTexture(GL_TEXTURE0 + 5);
  glBindTexture(GL_TEXTURE_2D, tex[1]);
  uint32_t color2[4] = {
    0xFFFF0000,
    0xFFFF00FF,
    0xFF00FF00,
    0xFF000000,
  };
  glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 2, 2, 0, GL_RGBA, GL_UNSIGNED_BYTE, color2);
  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);

  static const float vb[] = {
     -1.0f, -1.0f,
      1.0f, -1.0f,
     -1.0f,  1.0f,
     -1.0f,  1.0f,
      1.0f, -1.0f,
      1.0f,  1.0f,
  };

  GLuint vbo;