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/* Keep these in sync with GPU_shader.h */
#define INTERLACE_ROW 0
#define INTERLACE_COLUMN 1
#define INTERLACE_CHECKERBOARD 2
in vec2 texCoord_interp;
out vec4 fragColor;
uniform int interlace_id;
uniform sampler2D image_a;
uniform sampler2D image_b;
bool interlace()
{
if (interlace_id == INTERLACE_CHECKERBOARD) {
return (int(gl_FragCoord.x + gl_FragCoord.y) & 1) != 0;
}
else if (interlace_id == INTERLACE_ROW) {
return (int(gl_FragCoord.y) & 1) != 0;
}
else if (interlace_id == INTERLACE_COLUMN) {
return (int(gl_FragCoord.x) & 1) != 0;
}
}
void main()
{
if (interlace()) {
fragColor = texture(image_a, texCoord_interp);
}
else {
fragColor = texture(image_b, texCoord_interp);
}
}
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