Add WebGL compatibility

src/graphics/rendering/shaders/shading-vs-100.glsl

@@ -0,0 +1,55 @@
+#version 100
+
+precision lowp float;
+
+{macroDefinitions}
+
+uniform mat3 modelTransform;
+attribute vec4 vertexPosition;
+
+varying vec2 position;
+varying vec2 uvCoordinates;
+
+uniform vec2 squareToAspectRatio;
+
+#ifdef CIRCLE_LIGHT_COUNT
+#if CIRCLE_LIGHT_COUNT > 0
+    uniform vec2 circleLightCenters[CIRCLE_LIGHT_COUNT];
+    varying vec2 circleLightDirections[CIRCLE_LIGHT_COUNT];
+#endif
+#endif
+
+#ifdef FLASHLIGHT_COUNT
+#if FLASHLIGHT_COUNT > 0
+    uniform vec2 flashlightCenters[FLASHLIGHT_COUNT];
+    varying vec2 flashlightActualDirections[FLASHLIGHT_COUNT];
+#endif
+#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;
+
+    #ifdef CIRCLE_LIGHT_COUNT
+    #if CIRCLE_LIGHT_COUNT > 0
+        for (int i = 0; i < CIRCLE_LIGHT_COUNT; i++) {
+            circleLightDirections[i] = circleLightCenters[i] - position;
+        }
+    #endif
+    #endif
+
+    #ifdef FLASHLIGHT_COUNT
+    #if FLASHLIGHT_COUNT > 0
+        for (int i = 0; i < FLASHLIGHT_COUNT; i++) {
+            flashlightActualDirections[i] = flashlightCenters[i] - position;
+        }
+    #endif
+    #endif
+}