Allow symlinked frame files. Useful for testing.

[nageru] / splat.vert

diff --git a/splat.vert b/splat.vert
index 4a1ecd7496cc870749f87f08ce8f3dbc52463f6b..08462315264261ac9b3d230ca4c91d187f20394c 100644 (file)
--- a/splat.vert
+++ b/splat.vert
@@ -1,25 +1,32 @@
 #version 450 core
 
-in vec2 position;
+layout(location=0) in vec2 position;
 out vec2 image_pos;
 flat out vec2 flow, I_0_check_offset, I_1_check_offset;
 
-uniform bool invert_flow;
 uniform vec2 splat_size;  // In 0..1 coordinates.
 uniform vec2 inv_flow_size;
 uniform float alpha;
-uniform sampler2D flow_tex;
+uniform sampler2DArray flow_tex;  // 0 = forward flow, 1 = backward flow.
 
 void main()
 {
-       int x = gl_InstanceID % textureSize(flow_tex, 0).x;
-       int y = gl_InstanceID / textureSize(flow_tex, 0).x;
+       int instance = gl_InstanceID;
+       int num_pixels_per_layer = textureSize(flow_tex, 0).x * textureSize(flow_tex, 0).y;
+       int src_layer;
+       if (instance >= num_pixels_per_layer) {
+               instance -= num_pixels_per_layer;
+               src_layer = 1;
+       } else {
+               src_layer = 0;
+       }
+       int x = instance % textureSize(flow_tex, 0).x;
+       int y = instance / textureSize(flow_tex, 0).x;
 
        // Find out where to splat this to.
-       // TODO: See if we can move some of these calculations into uniforms.
-       vec2 full_flow = texelFetch(flow_tex, ivec2(x, y), 0).xy;
+       vec2 full_flow = texelFetch(flow_tex, ivec3(x, y, src_layer), 0).xy;
        float splat_alpha;
-       if (invert_flow) {
+       if (src_layer == 1) {  // Reverse flow.
                full_flow = -full_flow;
                splat_alpha = 1.0f - alpha;
        } else {
@@ -27,7 +34,7 @@ void main()
        }
        full_flow *= inv_flow_size;
        
-       vec2 patch_center = (ivec2(x, y) + 0.5) / textureSize(flow_tex, 0) + full_flow * splat_alpha;
+       vec2 patch_center = (ivec2(x, y) + 0.5) * inv_flow_size + full_flow * splat_alpha;
        image_pos = patch_center + splat_size * (position - 0.5);
 
        flow = full_flow;