Fix material properties not being applied on frame start

This was causing one of the clouds in the city to have its shadow drawn as an
opaque black splotch on every frame.

scgl/GLStateManager.cpp

@@ -153,6 +153,7 @@ void GLStateManager::InterleavedArrays(GLenum format, GLsizei stride, void const
 		// These extensions did not exist when SimCity 4 was released, so their workaround was to
 		// use the CPU to swap the order of color components. That's slow - let's never do that.
 		glColorPointer(GL_BGRA, GL_UNSIGNED_BYTE, stride, reinterpret_cast<uint8_t const*>(pointer) + colorOffset);
+		glMaterialfv(GL_FRONT, GL_DIFFUSE, diffuseLightParams);
 	}
 
 	shareable.interleavedPointer = pointer;
@@ -250,21 +251,23 @@ void GLStateManager::ShadeModel(GLenum mode) {
 }
 
 void GLStateManager::ColorMultiplier(float r, float g, float b) {
-	//if (ambientLightParams[0] != r || ambientLightParams[1] != g || ambientLightParams[2] != b) {
+	if (ambientLightParams[0] != r || ambientLightParams[1] != g || ambientLightParams[2] != b) {
 		ambientLightParams[0] = r;
 		ambientLightParams[1] = g;
 		ambientLightParams[2] = b;
 
 		glLightModelfv(GL_LIGHT_MODEL_AMBIENT, ambientLightParams);
-	//}
+	}
 }
 
 void GLStateManager::AlphaMultiplier(float a) {
-	//if (diffuseLightParams[3] != a) {
+	if (diffuseLightParams[3] != a) {
 		diffuseLightParams[3] = a;
 
-		glMaterialfv(GL_FRONT, GL_DIFFUSE, diffuseLightParams);
-	//}
+		if (ambientLightEnabled || diffuseLightEnabled) {
+			glMaterialfv(GL_FRONT, GL_DIFFUSE, diffuseLightParams);
+		}
+	}
 }
 
 void GLStateManager::EnableVertexColors(bool ambient, bool diffuse) {
@@ -298,6 +301,9 @@ void GLStateManager::EnableVertexColors(bool ambient, bool diffuse) {
 		}
 
 		glEnable(GL_COLOR_MATERIAL);
+		if (!oldFlags) {
+			glMaterialfv(GL_FRONT, GL_DIFFUSE, diffuseLightParams);
+		}
 	//}
 }