diff --git a/src/core/renderer_gl/renderer_gl.cpp b/src/core/renderer_gl/renderer_gl.cpp
index fa4d5ded..c50dcd74 100644
--- a/src/core/renderer_gl/renderer_gl.cpp
+++ b/src/core/renderer_gl/renderer_gl.cpp
@@ -103,29 +103,30 @@ const char* fragmentShader = R"(
 
 		vec4 final;
 
+		// TODO: figure out what the undocumented values do
 		switch (rgb_operand) {
-			case  0u: final.rgb = rgb_source.rgb; break; // Source color
-			case  1u: final.rgb = 1.0 - rgb_source.rgb; break; // One minus source color
-			case  2u: final.rgb = vec3(rgb_source.a); break; // Source alpha
-			case  3u: final.rgb = vec3(1.0 - rgb_source.a); break; // One minus source alpha
-			case  4u: final.rgb = vec3(rgb_source.r); break; // Source red
-			case  5u: final.rgb = vec3(1.0 - rgb_source.r); break; // One minus source red
-			case  8u: final.rgb = vec3(rgb_source.g); break; // Source green
-			case  9u: final.rgb = vec3(1.0 - rgb_source.g); break; // One minus source green
-			case 12u: final.rgb = vec3(rgb_source.b); break; // Source blue
-			case 13u: final.rgb = vec3(1.0 - rgb_source.b); break; // One minus source blue
-			default: break; // TODO: figure out what the undocumented values do
+			case  0u: final.rgb = rgb_source.rgb; break;            // Source color
+			case  1u: final.rgb = 1.0 - rgb_source.rgb; break;      // One minus source color
+			case  2u: final.rgb = vec3(rgb_source.a); break;        // Source alpha
+			case  3u: final.rgb = vec3(1.0 - rgb_source.a); break;  // One minus source alpha
+			case  4u: final.rgb = vec3(rgb_source.r); break;        // Source red
+			case  5u: final.rgb = vec3(1.0 - rgb_source.r); break;  // One minus source red
+			case  8u: final.rgb = vec3(rgb_source.g); break;        // Source green
+			case  9u: final.rgb = vec3(1.0 - rgb_source.g); break;  // One minus source green
+			case 12u: final.rgb = vec3(rgb_source.b); break;        // Source blue
+			case 13u: final.rgb = vec3(1.0 - rgb_source.b); break;  // One minus source blue
+			default: break;
 		}
 
 		switch (alpha_operand) {
-			case 0u: final.a = alpha_source.a; break; // Source alpha
-			case 1u: final.a = 1.0 - alpha_source.a; break; // One minus source alpha
-			case 2u: final.a = alpha_source.r; break; // Source red
-			case 3u: final.a = 1.0 - alpha_source.r; break; // One minus source red
-			case 4u: final.a = alpha_source.g; break; // Source green
-			case 5u: final.a = 1.0 - alpha_source.g; break; // One minus source green
-			case 6u: final.a = alpha_source.b; break; // Source blue
-			case 7u: final.a = 1.0 - alpha_source.b; break; // One minus source blue
+			case 0u: final.a = alpha_source.a; break;        // Source alpha
+			case 1u: final.a = 1.0 - alpha_source.a; break;  // One minus source alpha
+			case 2u: final.a = alpha_source.r; break;        // Source red
+			case 3u: final.a = 1.0 - alpha_source.r; break;  // One minus source red
+			case 4u: final.a = alpha_source.g; break;        // Source green
+			case 5u: final.a = 1.0 - alpha_source.g; break;  // One minus source green
+			case 6u: final.a = alpha_source.b; break;        // Source blue
+			case 7u: final.a = 1.0 - alpha_source.b; break;  // One minus source blue
 		}
 
 		return final;
@@ -141,33 +142,34 @@ const char* fragmentShader = R"(
 
 		vec4 result = vec4(1.0);
 
-		// TODO: test if the alpha combiner supports all the same modes as the color combiner.
-
+		// TODO: figure out what the undocumented values do
 		switch (rgb_combine) {
-			case 0u: result.rgb = source0.rgb; break; // Replace
-			case 1u: result.rgb = source0.rgb * source1.rgb; break; // Modulate
-			case 2u: result.rgb = min(vec3(1.0), source0.rgb + source1.rgb); break; // Add
-			case 3u: result.rgb = clamp(source0.rgb + source1.rgb - 0.5, vec3(0.0), vec3(1.0)); break; // Add signed
-			case 4u: result.rgb = mix(source1.rgb, source0.rgb, source2.rgb); break; // Interpolate
-			case 5u: result.rgb = max(vec3(0.0), source0.rgb - source1.rgb); break; // Subtract
-			case 6u: result.rgb = vec3(4.0 * dot(source0.rgb - 0.5 , source1.rgb - 0.5)); break; // Dot3 RGB
-			case 7u: result     = vec4(4.0 * dot(source0.rgb - 0.5 , source1.rgb - 0.5)); break; // Dot3 RGBA
-			case 8u: result.rgb = min(vec3(1.0), source0.rgb * source1.rgb + source2.rgb); break; // Multiply then add
-			case 9u: result.rgb = min(vec3(1.0), (source0.rgb + source1.rgb) * source2.rgb); break; // Add then multiply
-			default: break; // TODO: figure out what the undocumented values do
+			case 0u: result.rgb = source0.rgb; break;                                       // Replace
+			case 1u: result.rgb = source0.rgb * source1.rgb; break;                         // Modulate
+			case 2u: result.rgb = min(vec3(1.0), source0.rgb + source1.rgb); break;         // Add
+			case 3u: result.rgb = clamp(source0.rgb + source1.rgb - 0.5, 0.0, 1.0); break;  // Add signed
+			case 4u: result.rgb = mix(source1.rgb, source0.rgb, source2.rgb); break;        // Interpolate
+			case 5u: result.rgb = max(source0.rgb - source1.rgb, 0.0); break;               // Subtract
+			case 6u: result.rgb = vec3(4.0 * dot(source0.rgb - 0.5 , source1.rgb - 0.5)); break;  // Dot3 RGB
+			case 7u: result     = vec4(4.0 * dot(source0.rgb - 0.5 , source1.rgb - 0.5)); break;  // Dot3 RGBA
+			case 8u: result.rgb = min(source0.rgb * source1.rgb + source2.rgb, 1.0); break;       // Multiply then add
+			case 9u: result.rgb = min((source0.rgb + source1.rgb) * source2.rgb, 1.0); break;     // Add then multiply
+			default: break;
 		}
 
 		if (rgb_combine != 7u) { // The color combiner also writes the alpha channel in the "Dot3 RGBA" mode.
+			// TODO: figure out what the undocumented values do
+			// TODO: test if the alpha combiner supports all the same modes as the color combiner.
 			switch (alpha_combine) {
-				case 0u: result.a = source0.a; break; // Replace
-				case 1u: result.a = source0.a * source1.a; break; // Modulate
-				case 2u: result.a = min(1.0, source0.a + source1.a); break; // Add
-				case 3u: result.a = clamp(source0.a + source1.a - 0.5, 0.0, 1.0); break; // Add signed
-				case 4u: result.a = mix(source1.a, source0.a, source2.a); break; // Interpolate
-				case 5u: result.a = max(0.0, source0.a - source1.a); break; // Subtract
-				case 8u: result.a = min(1.0, source0.a * source1.a + source2.a); break; // Multiply then add
-				case 9u: result.a = min(1.0, (source0.a + source1.a) * source2.a); break; // Add then multiply
-				default: break; // TODO: figure out what the undocumented values do
+				case 0u: result.a = source0.a; break;                                      // Replace
+				case 1u: result.a = source0.a * source1.a; break;                          // Modulate
+				case 2u: result.a = min(1.0, source0.a + source1.a); break;                // Add
+				case 3u: result.a = clamp(source0.a + source1.a - 0.5, 0.0, 1.0); break;   // Add signed
+				case 4u: result.a = mix(source1.a, source0.a, source2.a); break;           // Interpolate
+				case 5u: result.a = max(0.0, source0.a - source1.a); break;                // Subtract
+				case 8u: result.a = min(1.0, source0.a * source1.a + source2.a); break;    // Multiply then add
+				case 9u: result.a = min(1.0, (source0.a + source1.a) * source2.a); break;  // Add then multiply
+				default: break;
 			}
 		}