Function lib_common_dFdx

src/CommonLibrary.cpp:1282–1301

			return bv_variable_create_float(0.0f); // floor() must have 1 argument!
		}
		bv_variable lib_common_dFdx(bv_program* prog, u8 count, bv_variable* args)
		{
			/* TODO */

			// IMPLEMENTATION IDEA: prog->user_data is pointer to sd::ShaderDebugger, maybe call dbg->Execute()
			// 2x2 (the block of fragments) and just shift gl_FragCoord.xy since we know
			// that the user is running GLSL code. 
			// --OR--: add a property to ShaderDebugger: glm::vec4 FragmentBlock[4] which then can be used here
			// and user can fill the data however he wants to

			/* dFdx(genType) */
			if (count == 1) {
				if (args[0].type == bv_type_object) { // dFdx(vec3), ...
					bv_object* vec = bv_variable_get_object(args[0]);
					return Common::create_vec(prog, bv_type_float, vec->type->props.name_count);
				}
				else {} // dFdx(scalar)
			}
			return bv_variable_create_float(0.0f);
		}
		bv_variable lib_common_dFdy(bv_program* prog, u8 count, bv_variable* args)
		{
			/* TODO */