I am trying to get this FXAA shader run on my machine.
It does not seem to recognize a function named texture2DLodOffset in GLSL. It also does not recognize texture2DLod. The texture2DLod function has apparently had an alternative in texture2D as the third argument bias. However, I could not find alternative to the former missing function texture2DLodOffset. Can somebody get me through this?
It would also be great if somebody could suggest me any more anti-aliasing techniques.
Specifications (working on a Virtual Machine):
OpenGL vendor string: Parallels and Intel Inc.
OpenGL renderer string: Parallels using Intel Iris OpenGL Engine
OpenGL version string: 2.1 INTEL-10.6.20
OpenGL shading language version string: 1.20
texture2DLodOffset() is from EXT_gpu_shader4, make sure that's supported on your GL implementation and enabled via:
#extension GL_EXT_gpu_shader4 : enable
after your #version directive.
Or, the jMonkeyEngine sources have some alternatives:
...
#if __VERSION_ >= 130
#define OffsetVec(a, b) ivec2(a, b)
#define FxaaTexOff(t, p, o, r) textureOffset(t, p, o)
#elif defined(GL_EXT_gpu_shader4)
#define OffsetVec(a, b) ivec2(a, b)
#define FxaaTexOff(t, p, o, r) texture2DLodOffset(t, p, 0.0, o)
#else
#define OffsetVec(a, b) vec2(a, b)
#define FxaaTexOff(t, p, o, r) texture2D(t, p + o * r)
#endif
...
You'll probably want the last set for #version 120:
#define OffsetVec(a, b) vec2(a, b)
#define FxaaTexOff(t, p, o, r) texture2D(t, p + o * r)