52 lines
1.2 KiB
Plaintext
52 lines
1.2 KiB
Plaintext
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renderProgram debugTools/showTexelDensity {
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program vertex glsl { <%
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attribute vec4 $texCoordAttrib;
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varying vec4 texcoord0;
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void main()
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{
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gl_Position = ftransform();
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texcoord0 = $texCoordAttrib;
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}
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%> }
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program fragment glsl { <%
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uniform vec4 $imageSize;
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varying vec4 texcoord0;
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void main( void ) {
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vec4 mult = $imageSize;//vec4( 4096, 4096, 1024, 1024 );
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vec4 dx = dFdx( texcoord0 * mult );
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vec4 dy = dFdy( texcoord0 * mult );
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vec4 delta = ( dx * dx + dy * dy );
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float minDelta = max( delta.x, delta.y );
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float mipLevel;
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if ( minDelta > 0.0 ) {
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mipLevel = 0.5 * log2( minDelta );
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} else {
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mipLevel = 0.0;
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}
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float l = log2( max(mult.x,mult.y) );
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int idx = int(mipLevel * l);
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gl_FragColor = vec4( mipLevel, mipLevel, mipLevel, mipLevel );
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if ( idx <= 0 ) {
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gl_FragColor = vec4(1.0,0.0,0.0,1.0);
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}
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if ( idx == 1 ) {
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gl_FragColor = vec4(0.0,1.0,0.0,1.0);
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}
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if ( idx == 2 ) {
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gl_FragColor = vec4(0.0,0.0,1.0,1.0);
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}
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if ( idx == 3 ) {
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gl_FragColor = vec4(1.0,0.0,1.0,1.0);
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}
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if ( idx == 4 ) {
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gl_FragColor = vec4(0.0,1.0,1.0,1.0);
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}
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}
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%> }
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}
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