53 lines
1.2 KiB
GLSL
53 lines
1.2 KiB
GLSL
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/* Keep these in sync with GPU_shader.h */
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#define INTERLACE_ROW 0
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#define INTERLACE_COLUMN 1
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#define INTERLACE_CHECKERBOARD 2
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#if __VERSION__ == 120
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varying vec2 texCoord_interp;
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#define fragColor gl_FragColor
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#else
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in vec2 texCoord_interp;
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out vec4 fragColor;
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#define texture2DRect texture
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#endif
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uniform int interlace_id;
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uniform sampler2DRect image_a;
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uniform sampler2DRect image_b;
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bool interlace()
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{
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#if __VERSION__ == 120
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if (interlace_id == INTERLACE_CHECKERBOARD) {
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return int(mod(gl_FragCoord.x + gl_FragCoord.y, 2)) != 0;
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}
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else if (interlace_id == INTERLACE_ROW) {
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return int(mod(gl_FragCoord.y, 2)) != 0;
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}
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else if (interlace_id == INTERLACE_COLUMN) {
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return int(mod(gl_FragCoord.x, 2)) != 0;
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}
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#else
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if (interlace_id == INTERLACE_CHECKERBOARD) {
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return (int(gl_FragCoord.x + gl_FragCoord.y) & 1) != 0;
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}
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else if (interlace_id == INTERLACE_ROW) {
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return (int(gl_FragCoord.y) & 1) != 0;
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}
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else if (interlace_id == INTERLACE_COLUMN) {
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return (int(gl_FragCoord.x) & 1) != 0;
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}
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#endif
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}
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void main()
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{
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if (interlace()) {
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fragColor = texture2DRect(image_a, texCoord_interp);
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} else {
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fragColor = texture2DRect(image_b, texCoord_interp);
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}
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}
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