Add more improvements

src/graphics/rendering/shaders/shading-vs.glsl

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+#version 300 es
+
+precision lowp float;
+
+{macroDefinitions}
+
+uniform mat3 modelTransform;
+in vec4 vertexPosition;
+
+out vec2 position;
+out vec2 uvCoordinates;
+
+uniform vec2 squareToAspectRatio;
+
+#if CIRCLE_LIGHT_COUNT > 0
+    uniform struct CircleLight {
+        vec2 center;
+        float lightDrop;
+        vec3 value;
+    }[CIRCLE_LIGHT_COUNT] circleLights;
+
+    out vec2[CIRCLE_LIGHT_COUNT] circleLightDirections;
+#endif
+
+#if FLASHLIGHT_COUNT > 0
+    uniform struct Flashlight {
+        vec2 center;
+        vec2 direction;
+        float lightDrop;
+        vec3 value;
+    }[FLASHLIGHT_COUNT] flashlights;
+
+    out vec2[FLASHLIGHT_COUNT] flashlightDirections;
+#endif
+
+void main() {
+    vec3 vertexPosition2D = vec3(vertexPosition.xy, 1.0) * modelTransform;
+    gl_Position = vec4(vertexPosition2D.xy, 0.0, 1.0);
+    position = vertexPosition2D.xy * squareToAspectRatio;
+
+    uvCoordinates = (vertexPosition2D * mat3(
+        0.5, 0.0, 0.5,
+        0.0, 0.5, 0.5,
+        0.0, 0.0, 1.0
+    )).xy;
+
+    #if CIRCLE_LIGHT_COUNT > 0
+        for (int i = 0; i < CIRCLE_LIGHT_COUNT; i++) {
+            circleLightDirections[i] = circleLights[i].center - position;
+        }
+    #endif
+
+    #if FLASHLIGHT_COUNT > 0
+        for (int i = 0; i < FLASHLIGHT_COUNT; i++) {
+            flashlightDirections[i] = flashlights[i].center - position;
+        }
+    #endif
+}