In ResampleEffect, precompute the Lanczos function into a table.

[movit] / vs.130.vert

diff --git a/vs.130.vert b/vs.130.vert
index 7b4ebab577156caa0819e929d06d67bede8d0e1b..7d00f3cb87980bcd702572040cef208615aaeddb 100644 (file)
--- a/vs.130.vert
+++ b/vs.130.vert
@@ -4,6 +4,10 @@ in vec2 position;
 in vec2 texcoord;
 out vec2 tc;
 
+// Will be overridden by compile_glsl_program() if needed.
+// (It cannot just be prepended, as #version must be before everything.)
+#define FLIP_ORIGIN 0
+
 void main()
 {
        // The result of glOrtho(0.0, 1.0, 0.0, 1.0, 0.0, 1.0) is:
@@ -14,4 +18,7 @@ void main()
        //   0.000  0.000  0.000  1.000
        gl_Position = vec4(2.0 * position.x - 1.0, 2.0 * position.y - 1.0, -1.0, 1.0);
        tc = texcoord;
+#if FLIP_ORIGIN
+       tc.y = 1.0f - tc.y;
+#endif
 }