diff options
author | Brian <brian@yutani.localnet.net> | 2007-02-03 11:36:16 -0700 |
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committer | Brian <brian@yutani.localnet.net> | 2007-02-03 11:36:16 -0700 |
commit | edf24e699ea75660eee0a62456ab2cbadf1b489f (patch) | |
tree | 45bee2dd5e0cd7f3e701322384c551fe8026f11b /progs/glsl/shadowtex.frag.txt | |
parent | 00d63aafc6d938f13acc9b136ff210fb0bbb15f9 (diff) |
shading language texture demo/test
Diffstat (limited to 'progs/glsl/shadowtex.frag.txt')
-rw-r--r-- | progs/glsl/shadowtex.frag.txt | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/progs/glsl/shadowtex.frag.txt b/progs/glsl/shadowtex.frag.txt new file mode 100644 index 0000000000..a6a80da47f --- /dev/null +++ b/progs/glsl/shadowtex.frag.txt @@ -0,0 +1,21 @@ +// Fragment shader for 2D texture with shadow attenuation +// Brian Paul + + +uniform sampler2D tex2d; +uniform vec3 lightPos; + +void main() +{ + // XXX should compute this from lightPos + vec2 shadowCenter = vec2(-0.25, -0.25); + + // d = distance from center + float d = distance(gl_TexCoord[0].xy, shadowCenter); + + // attenuate and clamp + d = clamp(d * d * d, 0.0, 2.0); + + // modulate texture by d for shadow effect + gl_FragColor = d * texture2D(tex2d, gl_TexCoord[0].xy, 0.0); +} |