Repo created

libs/shaders/GL/smaa_blending_weight.vsh.glsl

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+// Implementation of Subpixel Morphological Antialiasing (SMAA) is based on https://github.com/iryoku/smaa
+layout (location = 0) in vec2 a_pos;
+layout (location = 1) in vec2 a_tcoord;
+
+layout (location = 0) out vec4 v_coords;
+layout (location = 1) out vec4 v_offset0;
+layout (location = 2) out vec4 v_offset1;
+layout (location = 3) out vec4 v_offset2;
+
+layout (binding = 0) uniform UBO
+{
+  vec4 u_framebufferMetrics;
+};
+
+// SMAA_MAX_SEARCH_STEPS specifies the maximum steps performed in the
+// horizontal/vertical pattern searches, at each side of the pixel.
+#define SMAA_MAX_SEARCH_STEPS 8.0
+const vec4 kMaxSearchSteps = vec4(-2.0 * SMAA_MAX_SEARCH_STEPS, 2.0 * SMAA_MAX_SEARCH_STEPS,
+                                  -2.0 * SMAA_MAX_SEARCH_STEPS, 2.0  * SMAA_MAX_SEARCH_STEPS);
+
+void main()
+{
+  v_coords = vec4(a_tcoord, a_tcoord * u_framebufferMetrics.zw);
+  // We will use these offsets for the searches.
+  v_offset0 = u_framebufferMetrics.xyxy * vec4(-0.25, -0.125, 1.25, -0.125) + a_tcoord.xyxy;
+  v_offset1 = u_framebufferMetrics.xyxy * vec4(-0.125, -0.25, -0.125, 1.25) + a_tcoord.xyxy;
+  // And these for the searches, they indicate the ends of the loops.
+  v_offset2 = u_framebufferMetrics.xxyy * kMaxSearchSteps + vec4(v_offset0.xz, v_offset1.yw);
+  gl_Position = vec4(a_pos, 0.0, 1.0);
+}