Merge pull request #1314 from SamuelCho/macDeferredLightingFix

Reorder fragment shader destination binds to fix Mac deferred lighting.

Author: asarium

code/graphics/opengl/gropenglshader.cpp

@@ -582,6 +582,13 @@ int opengl_compile_shader(shader_type sdr, uint flags)
 				glBindAttribLocation(program->getShaderHandle(), i, GL_vertex_attrib_info[i].name.c_str());
 			}
 
+			// bind fragment data locations before we link the shader
+			glBindFragDataLocation(program->getShaderHandle(), 0, "fragOut0");
+			glBindFragDataLocation(program->getShaderHandle(), 1, "fragOut1");
+			glBindFragDataLocation(program->getShaderHandle(), 2, "fragOut2");
+			glBindFragDataLocation(program->getShaderHandle(), 3, "fragOut3");
+			glBindFragDataLocation(program->getShaderHandle(), 4, "fragOut4");
+
 			if (do_shader_caching()) {
 				// Enable shader caching
 				glProgramParameteri(program->getShaderHandle(), GL_PROGRAM_BINARY_RETRIEVABLE_HINT, GL_TRUE);
@@ -602,13 +609,6 @@ int opengl_compile_shader(shader_type sdr, uint flags)
 
 	opengl_shader_set_current(&new_shader);
 
-	// bind fragment data locations
-	glBindFragDataLocation(new_shader.program->getShaderHandle(), 0, "fragOut0");
-	glBindFragDataLocation(new_shader.program->getShaderHandle(), 1, "fragOut1");
-	glBindFragDataLocation(new_shader.program->getShaderHandle(), 2, "fragOut2");
-	glBindFragDataLocation(new_shader.program->getShaderHandle(), 3, "fragOut3");
-	glBindFragDataLocation(new_shader.program->getShaderHandle(), 4, "fragOut4");
-
 	// initialize uniforms and attributes
 	for (auto& unif : sdr_info->uniforms) {
 		new_shader.program->Uniforms.initUniform(unif);