5 out vec2 patch_bottom_left_texel; // Center of bottom-left texel of patch.
7 uniform vec2 inv_flow_size, inv_image_size;
11 // The result of glOrtho(0.0, 1.0, 0.0, 1.0, 0.0, 1.0) is:
13 // 2.000 0.000 0.000 -1.000
14 // 0.000 2.000 0.000 -1.000
15 // 0.000 0.000 -2.000 -1.000
16 // 0.000 0.000 0.000 1.000
17 gl_Position = vec4(2.0 * position.x - 1.0, 2.0 * position.y - 1.0, -1.0, 1.0);
20 vec2 patch_bottom_left = position - vec2(0.5, 0.5) * inv_flow_size;
21 patch_bottom_left_texel = patch_bottom_left + vec2(0.5, 0.5) * inv_image_size;