Shader setup example.

vtheno · Aug 18, 2014 · ac5c487 · ac5c487
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diff --git a/html/examples/shader_setup.htm b/html/examples/shader_setup.htm
@@ -0,0 +1,19 @@
+// The index returned from these GLint functions gets passed to {%glEnableVertexAttribArray} during rendering.
+GLint position_attrib_index = {%glGetAttribLocation}(program, "position"); // program is what is returned by {%glCreateProgram}.
+GLint texcoord_attrib_index = {%glGetAttribLocation}(program, "texcoord");
+GLint normal_attrib_index = {%glGetAttribLocation}(program, "normal");
+GLint color_attrib_index = {%glGetAttribLocation}(program, "color");
+
+{%glBindFragDataLocation}(program, 0, "output_color"); // "output_color" is an output value in your vertex shader and an input value in your fragment shader.
+
+GLint num_uniforms;
+{%glGetProgramiv}(program, GL_ACTIVE_UNIFORMS, &num_uniforms);
+GLchar uniform_name[256];
+GLsizei length;
+GLint size;
+GLenum type;
+for (int i = 0; i < num_uniforms; i++)
+{
+	{%glGetActiveUniform}(program, i, sizeof(uniform_name), &length, &size, &type, uniform_name);
+	// ... save this uniform data so it can be used during rendering
+}
diff --git a/opengl.py b/opengl.py
@@ -23,6 +23,10 @@
     'description': 'Compile a program from a vertex shader and a fragment shader.',
     'commands': [ 'glCreateShader', 'glShaderSource', 'glCompileShader', 'glGetShaderiv', 'glGetShaderInfoLog', 'glCreateProgram', 'glBindAttribLocation', 'glAttachShader', 'glLinkProgram', 'glGetProgramiv' ],
   },
+  'shader_setup': {
+    'description': 'Retrieve uniform data after the shader has been compiled',
+    'commands': [ 'glGetAttribLocation', 'glBindFragDataLocation', 'glGetProgramiv', 'glGetActiveUniform' ],
+  },
 }
 
 def reverse_version_index(command_list):