Function gears_init

test/full_es2_sdlproc.c:653–714

"}";

static void
gears_init(void)
{
   GLuint v, f, program;
   const char *p;
   char msg[512];

   glEnable(GL_CULL_FACE);
   glEnable(GL_DEPTH_TEST);

   /* Compile the vertex shader */
   p = vertex_shader;
   v = glCreateShader(GL_VERTEX_SHADER);
   glShaderSource(v, 1, &p, NULL);
   glCompileShader(v);
   glGetShaderInfoLog(v, sizeof msg, NULL, msg);
   printf("vertex shader info: %s\n", msg);

   /* Compile the fragment shader */
   p = fragment_shader;
   f = glCreateShader(GL_FRAGMENT_SHADER);
   glShaderSource(f, 1, &p, NULL);
   glCompileShader(f);
   glGetShaderInfoLog(f, sizeof msg, NULL, msg);
   printf("fragment shader info: %s\n", msg);

   /* Create and link the shader program */
   program = glCreateProgram();
   glAttachShader(program, v);
   glAttachShader(program, f);
   glBindAttribLocation(program, 0, "position");
   glBindAttribLocation(program, 1, "normal");

   glLinkProgram(program);
   glGetProgramInfoLog(program, sizeof msg, NULL, msg);
   printf("info: %s\n", msg);

   /* Enable the shaders */
   glUseProgram(program);

   /* Get the locations of the uniforms so we can access them */
   ModelViewProjectionMatrix_location = glGetUniformLocation(program, "ModelViewProjectionMatrix");
   NormalMatrix_location = glGetUniformLocation(program, "NormalMatrix");
   LightSourcePosition_location = glGetUniformLocation(program, "LightSourcePosition");
   MaterialColor_location = glGetUniformLocation(program, "MaterialColor");

   /* Set the LightSourcePosition uniform which is constant throught the program */
   glUniform4fv(LightSourcePosition_location, 1, LightSourcePosition);

   {
      GLfloat LightSourcePosition_copy[4];
      glGetUniformfv(program, LightSourcePosition_location, LightSourcePosition_copy);
      for (uint32_t i = 0; i < 4; ++i) {
        assert(LightSourcePosition[i] == LightSourcePosition_copy[i]);
      }
   }

   /* make the gears */