Add 4.5 engine files

Shaders/smooth-chessboard-gray/smooth-chessboard-gray.glsl

@@ -0,0 +1,74 @@
+#if defined(VERTEX)
+
+attribute vec4 VertexCoord;
+attribute vec4 COLOR;
+attribute vec4 TexCoord;
+varying vec4 COL0;
+varying vec4 TEX0;
+
+vec4 _oPosition1; 
+uniform mat4 MVPMatrix;
+uniform int FrameDirection;
+uniform int FrameCount;
+uniform vec2 OutputSize;
+uniform vec2 TextureSize;
+uniform vec2 InputSize;
+
+void main()
+{
+    vec4 _oColor;
+    vec2 _otexCoord;
+    gl_Position = VertexCoord.x * MVPMatrix[0] + VertexCoord.y * MVPMatrix[1] + VertexCoord.z * MVPMatrix[2] + VertexCoord.w * MVPMatrix[3];
+    _oPosition1 = gl_Position;
+    _oColor = COLOR;
+    _otexCoord = TexCoord.xy;
+    COL0 = COLOR;
+    TEX0.xy = TexCoord.xy;
+}
+
+#elif defined(FRAGMENT)
+
+#define BRIGHTNESS 0.5
+
+struct output_dummy {
+    vec4 _color;
+};
+
+uniform int FrameDirection;
+uniform int FrameCount;
+uniform vec2 OutputSize;
+uniform vec2 TextureSize;
+uniform vec2 InputSize;
+uniform sampler2D Texture;
+varying vec4 TEX0;
+//standard texture sample looks like this: texture2D(Texture, TEX0.xy);
+
+void main()
+{
+	vec4 myColor = texture2D(Texture, TEX0.xy);
+	mat4 neighbours = mat4(
+		texture2D(Texture, vec2(TEX0.x+1./TextureSize.x, TEX0.y)),
+		texture2D(Texture, vec2(TEX0.x-1./TextureSize.x, TEX0.y)),
+		texture2D(Texture, vec2(TEX0.x, TEX0.y+1./TextureSize.y)),
+		texture2D(Texture, vec2(TEX0.x, TEX0.y-1./TextureSize.y))
+	);	
+	mat4 zero = mat4(
+		0.,0.,0.,0.,
+		0.,0.,0.,0.,
+		0.,0.,0.,0.,
+		0.,0.,0.,0.
+	);
+	
+    if(length(myColor) == 0. && neighbours != zero){
+    	
+    	myColor = ((neighbours[0] + neighbours[1] + neighbours[2] + neighbours[3]) / 4.) * BRIGHTNESS;
+    	
+    } else if (length(myColor) != 0. && neighbours == zero) {
+    	
+    	myColor = myColor * BRIGHTNESS;
+    	
+    }
+    gl_FragColor = myColor;
+    return;
+} 
+#endif