polyvox/examples/common/example.frag
Matt Williams 140cbc0fc7 Move shader code to external files rather than embedded
A bit of CMake code in each example copies the files to the
correct location and Qt loads them from the application's binary
directory.
2014-05-27 15:08:20 +01:00

20 lines
794 B
GLSL

#version 130
// Passed in from the vertex shader
in vec4 worldPosition;
in vec4 worldNormal;
// the color that gets written to the display
out vec4 outputColor;
void main()
{
// Again, for the purposes of these examples we cannot be sure that per-vertex normals are provided. A sensible fallback
// is to use this little trick to compute per-fragment flat-shaded normals from the world positions using derivative operations.
vec3 normal = normalize(cross(dFdy(worldPosition.xyz), dFdx(worldPosition.xyz)));
// We are just using the normal as the output color, and making it lighter so it looks a bit nicer.
// Obviously a real shader would also do texuring, lighting, or whatever is required for the application.
outputColor = vec4(abs(normal) * 0.5 + vec3(0.5, 0.5, 0.5), 1.0);
}