Add Conway's Game of Life compute shader example. (#2088)

* Add Conway's Game of Life compute shader example.

* Fix various shaders problems, and tune command buffer size.

* Various coding convention changes.

examples/shaders/resources/shaders/glsl430/gol_render.glsl

@@ -0,0 +1,34 @@
+// Game of Life rendering shader
+// Just renders the content of the ssbo at binding 1 to screen.
+#version 430
+
+#define GOL_WIDTH 768
+
+// Input vertex attributes (from vertex shader)
+in vec2 fragTexCoord;
+
+// Output fragment color
+out vec4 finalColor;
+
+// Input game of life grid.
+layout(std430, binding = 1) readonly buffer golLayout
+{
+    uint golBuffer[];
+};
+
+// Output resolution
+uniform vec2 res;
+
+void main()
+{
+    ivec2 coords = ivec2(fragTexCoord * res);
+
+    if (golBuffer[coords.x + coords.y * uvec2(res).x] == 1)
+    {
+        finalColor = vec4(1.0);
+    }
+    else
+    {
+        finalColor = vec4(0.0, 0.0, 0.0, 1.0);
+    }
+}