41 lines
1.3 KiB
GLSL
41 lines
1.3 KiB
GLSL
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#extension GL_ARB_texture_rectangle : enable
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uniform sampler2DRect osgOcean_ColorTexture;
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uniform sampler2DRect osgOcean_LuminanceTexture;
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uniform float osgOcean_GlareThreshold;
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const vec2 s1 = vec2(-1, 1);
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const vec2 s2 = vec2( 1, 1);
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const vec2 s3 = vec2( 1,-1);
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const vec2 s4 = vec2(-1,-1);
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void main( void )
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{
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vec2 texCoordSample = vec2(0.0);
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texCoordSample = gl_TexCoord[0].st + s1;
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vec4 color = texture2DRect(osgOcean_ColorTexture, texCoordSample);
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float lum = texture2DRect(osgOcean_LuminanceTexture, texCoordSample).r;
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texCoordSample = gl_TexCoord[0].st + s2;
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color += texture2DRect(osgOcean_ColorTexture, texCoordSample);
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lum += texture2DRect(osgOcean_LuminanceTexture, texCoordSample).r;
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texCoordSample = gl_TexCoord[0].st + s3;
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color += texture2DRect(osgOcean_ColorTexture, texCoordSample);
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lum += texture2DRect(osgOcean_LuminanceTexture, texCoordSample).r;
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texCoordSample = gl_TexCoord[0].st +s4;
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color += texture2DRect(osgOcean_ColorTexture, texCoordSample);
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lum += texture2DRect(osgOcean_LuminanceTexture, texCoordSample).r;
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color = color*0.25;
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lum = lum*0.25;
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// only want very high luminance values to pass otherwise
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// we get streaks all over the scene
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if(lum >= osgOcean_GlareThreshold)
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gl_FragColor = color;
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else
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gl_FragColor = vec4(0.0);
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}
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