Raw SMAA shaders.

Sources/cycles/renderpipeline/SMAAData.hx

@@ -31,6 +31,11 @@
 // #define AREATEX_PITCH (AREATEX_WIDTH * 2)
 // #define AREATEX_SIZE (AREATEX_HEIGHT * AREATEX_PITCH)
 
+// #define SEARCHTEX_WIDTH 64
+// #define SEARCHTEX_HEIGHT 16
+// #define SEARCHTEX_PITCH SEARCHTEX_WIDTH
+// #define SEARCHTEX_SIZE (SEARCHTEX_HEIGHT * SEARCHTEX_PITCH)
+
 package cycles.renderpipeline;
 
 class SMAAAreaData {

raw/smaa_pass/smaa_blend_weight.frag.glsl

@@ -0,0 +1,122 @@
+#version 450
+
+#ifdef GL_ES
+precision mediump float;
+#endif
+
+
+uniform sampler2D tex;
+
+in vec2 texCoord;
+
+
+// Blending Weight Calculation Pixel Shader (Second Pass)
+
+float4 SMAABlendingWeightCalculationPS(float2 texcoord,
+                                       float2 pixcoord,
+                                       float4 offset[3],
+                                       SMAATexture2D(edgesTex),
+                                       SMAATexture2D(areaTex),
+                                       SMAATexture2D(searchTex),
+                                       float4 subsampleIndices) { // Just pass zero for SMAA 1x, see @SUBSAMPLE_INDICES.
+    float4 weights = float4(0.0, 0.0, 0.0, 0.0);
+
+    float2 e = SMAASample(edgesTex, texcoord).rg;
+
+    SMAA_BRANCH
+    if (e.g > 0.0) { // Edge at north
+        #if !defined(SMAA_DISABLE_DIAG_DETECTION)
+        // Diagonals have both north and west edges, so searching for them in
+        // one of the boundaries is enough.
+        weights.rg = SMAACalculateDiagWeights(SMAATexturePass2D(edgesTex), SMAATexturePass2D(areaTex), texcoord, e, subsampleIndices);
+
+        // We give priority to diagonals, so if we find a diagonal we skip 
+        // horizontal/vertical processing.
+        SMAA_BRANCH
+        if (weights.r == -weights.g) { // weights.r + weights.g == 0.0
+        #endif
+
+        float2 d;
+
+        // Find the distance to the left:
+        float3 coords;
+        coords.x = SMAASearchXLeft(SMAATexturePass2D(edgesTex), SMAATexturePass2D(searchTex), offset[0].xy, offset[2].x);
+        coords.y = offset[1].y; // offset[1].y = texcoord.y - 0.25 * SMAA_RT_METRICS.y (@CROSSING_OFFSET)
+        d.x = coords.x;
+
+        // Now fetch the left crossing edges, two at a time using bilinear
+        // filtering. Sampling at -0.25 (see @CROSSING_OFFSET) enables to
+        // discern what value each edge has:
+        float e1 = SMAASampleLevelZero(edgesTex, coords.xy).r;
+
+        // Find the distance to the right:
+        coords.z = SMAASearchXRight(SMAATexturePass2D(edgesTex), SMAATexturePass2D(searchTex), offset[0].zw, offset[2].y);
+        d.y = coords.z;
+
+        // We want the distances to be in pixel units (doing this here allow to
+        // better interleave arithmetic and memory accesses):
+        d = abs(round(mad(SMAA_RT_METRICS.zz, d, -pixcoord.xx)));
+
+        // SMAAArea below needs a sqrt, as the areas texture is compressed
+        // quadratically:
+        float2 sqrt_d = sqrt(d);
+
+        // Fetch the right crossing edges:
+        float e2 = SMAASampleLevelZeroOffset(edgesTex, coords.zy, int2(1, 0)).r;
+
+        // Ok, we know how this pattern looks like, now it is time for getting
+        // the actual area:
+        weights.rg = SMAAArea(SMAATexturePass2D(areaTex), sqrt_d, e1, e2, subsampleIndices.y);
+
+        // Fix corners:
+        coords.y = texcoord.y;
+        SMAADetectHorizontalCornerPattern(SMAATexturePass2D(edgesTex), weights.rg, coords.xyzy, d);
+
+        #if !defined(SMAA_DISABLE_DIAG_DETECTION)
+        } else
+            e.r = 0.0; // Skip vertical processing.
+        #endif
+    }
+
+    SMAA_BRANCH
+    if (e.r > 0.0) { // Edge at west
+        float2 d;
+
+        // Find the distance to the top:
+        float3 coords;
+        coords.y = SMAASearchYUp(SMAATexturePass2D(edgesTex), SMAATexturePass2D(searchTex), offset[1].xy, offset[2].z);
+        coords.x = offset[0].x; // offset[1].x = texcoord.x - 0.25 * SMAA_RT_METRICS.x;
+        d.x = coords.y;
+
+        // Fetch the top crossing edges:
+        float e1 = SMAASampleLevelZero(edgesTex, coords.xy).g;
+
+        // Find the distance to the bottom:
+        coords.z = SMAASearchYDown(SMAATexturePass2D(edgesTex), SMAATexturePass2D(searchTex), offset[1].zw, offset[2].w);
+        d.y = coords.z;
+
+        // We want the distances to be in pixel units:
+        d = abs(round(mad(SMAA_RT_METRICS.ww, d, -pixcoord.yy)));
+
+        // SMAAArea below needs a sqrt, as the areas texture is compressed 
+        // quadratically:
+        float2 sqrt_d = sqrt(d);
+
+        // Fetch the bottom crossing edges:
+        float e2 = SMAASampleLevelZeroOffset(edgesTex, coords.xz, int2(0, 1)).g;
+
+        // Get the area for this direction:
+        weights.ba = SMAAArea(SMAATexturePass2D(areaTex), sqrt_d, e1, e2, subsampleIndices.x);
+
+        // Fix corners:
+        coords.x = texcoord.x;
+        SMAADetectVerticalCornerPattern(SMAATexturePass2D(edgesTex), weights.ba, coords.xyxz, d);
+    }
+
+    return weights;
+}
+
+
+void main() {
+    // gl_FragColor = vec4(col);
+}

raw/smaa_pass/smaa_blend_weight.vert.glsl

@@ -0,0 +1,34 @@
+#version 450
+
+#ifdef GL_ES
+precision highp float;
+#endif
+
+in vec2 pos;
+
+out vec2 texCoord;
+
+const vec2 madd = vec2(0.5, 0.5);
+
+
+// Blend Weight Calculation Vertex Shader
+void SMAABlendingWeightCalculationVS(float2 texcoord, out float2 pixcoord, out float4 offset[3]) {
+    pixcoord = texcoord * SMAA_RT_METRICS.zw;
+
+    // We will use these offsets for the searches later on (see @PSEUDO_GATHER4):
+    offset[0] = mad(SMAA_RT_METRICS.xyxy, float4(-0.25, -0.125,  1.25, -0.125), texcoord.xyxy);
+    offset[1] = mad(SMAA_RT_METRICS.xyxy, float4(-0.125, -0.25, -0.125,  1.25), texcoord.xyxy);
+
+    // And these for the searches, they indicate the ends of the loops:
+    offset[2] = mad(SMAA_RT_METRICS.xxyy,
+                    float4(-2.0, 2.0, -2.0, 2.0) * float(SMAA_MAX_SEARCH_STEPS),
+                    float4(offset[0].xz, offset[1].yw));
+}
+
+
+void main() {
+  // Scale vertex attribute to [0-1] range
+  texCoord = pos.xy * madd + madd;
+
+  gl_Position = vec4(pos.xy, 0.0, 1.0);
+}

raw/smaa_pass/smaa_edge_detect.frag.glsl

@@ -0,0 +1,475 @@
+#version 450
+
+#ifdef GL_ES
+precision mediump float;
+#endif
+
+uniform sampler2D tex;
+
+in vec2 texCoord;
+
+// Edge Detection Pixel Shaders (First Pass)
+
+/**
+ * Luma Edge Detection
+ *
+ * IMPORTANT NOTICE: luma edge detection requires gamma-corrected colors, and
+ * thus 'colorTex' should be a non-sRGB texture.
+ */
+float2 SMAALumaEdgeDetectionPS(float2 texcoord,
+                               float4 offset[3],
+                               SMAATexture2D(colorTex)
+                               #if SMAA_PREDICATION
+                               , SMAATexture2D(predicationTex)
+                               #endif
+                               ) {
+    // Calculate the threshold:
+    #if SMAA_PREDICATION
+    float2 threshold = SMAACalculatePredicatedThreshold(texcoord, offset, SMAATexturePass2D(predicationTex));
+    #else
+    float2 threshold = float2(SMAA_THRESHOLD, SMAA_THRESHOLD);
+    #endif
+
+    // Calculate lumas:
+    float3 weights = float3(0.2126, 0.7152, 0.0722);
+    float L = dot(SMAASamplePoint(colorTex, texcoord).rgb, weights);
+
+    float Lleft = dot(SMAASamplePoint(colorTex, offset[0].xy).rgb, weights);
+    float Ltop  = dot(SMAASamplePoint(colorTex, offset[0].zw).rgb, weights);
+
+    // We do the usual threshold:
+    float4 delta;
+    delta.xy = abs(L - float2(Lleft, Ltop));
+    float2 edges = step(threshold, delta.xy);
+
+    // Then discard if there is no edge:
+    if (dot(edges, float2(1.0, 1.0)) == 0.0)
+        discard;
+
+    // Calculate right and bottom deltas:
+    float Lright = dot(SMAASamplePoint(colorTex, offset[1].xy).rgb, weights);
+    float Lbottom  = dot(SMAASamplePoint(colorTex, offset[1].zw).rgb, weights);
+    delta.zw = abs(L - float2(Lright, Lbottom));
+
+    // Calculate the maximum delta in the direct neighborhood:
+    float2 maxDelta = max(delta.xy, delta.zw);
+
+    // Calculate left-left and top-top deltas:
+    float Lleftleft = dot(SMAASamplePoint(colorTex, offset[2].xy).rgb, weights);
+    float Ltoptop = dot(SMAASamplePoint(colorTex, offset[2].zw).rgb, weights);
+    delta.zw = abs(float2(Lleft, Ltop) - float2(Lleftleft, Ltoptop));
+
+    // Calculate the final maximum delta:
+    maxDelta = max(maxDelta.xy, delta.zw);
+    float finalDelta = max(maxDelta.x, maxDelta.y);
+
+    // Local contrast adaptation:
+    edges.xy *= step(finalDelta, SMAA_LOCAL_CONTRAST_ADAPTATION_FACTOR * delta.xy);
+
+    return edges;
+}
+
+/**
+ * Color Edge Detection
+ *
+ * IMPORTANT NOTICE: color edge detection requires gamma-corrected colors, and
+ * thus 'colorTex' should be a non-sRGB texture.
+ */
+float2 SMAAColorEdgeDetectionPS(float2 texcoord,
+                                float4 offset[3],
+                                SMAATexture2D(colorTex)
+                                #if SMAA_PREDICATION
+                                , SMAATexture2D(predicationTex)
+                                #endif
+                                ) {
+    // Calculate the threshold:
+    #if SMAA_PREDICATION
+    float2 threshold = SMAACalculatePredicatedThreshold(texcoord, offset, predicationTex);
+    #else
+    float2 threshold = float2(SMAA_THRESHOLD, SMAA_THRESHOLD);
+    #endif
+
+    // Calculate color deltas:
+    float4 delta;
+    float3 C = SMAASamplePoint(colorTex, texcoord).rgb;
+
+    float3 Cleft = SMAASamplePoint(colorTex, offset[0].xy).rgb;
+    float3 t = abs(C - Cleft);
+    delta.x = max(max(t.r, t.g), t.b);
+
+    float3 Ctop  = SMAASamplePoint(colorTex, offset[0].zw).rgb;
+    t = abs(C - Ctop);
+    delta.y = max(max(t.r, t.g), t.b);
+
+    // We do the usual threshold:
+    float2 edges = step(threshold, delta.xy);
+
+    // Then discard if there is no edge:
+    if (dot(edges, float2(1.0, 1.0)) == 0.0)
+        discard;
+
+    // Calculate right and bottom deltas:
+    float3 Cright = SMAASamplePoint(colorTex, offset[1].xy).rgb;
+    t = abs(C - Cright);
+    delta.z = max(max(t.r, t.g), t.b);
+
+    float3 Cbottom  = SMAASamplePoint(colorTex, offset[1].zw).rgb;
+    t = abs(C - Cbottom);
+    delta.w = max(max(t.r, t.g), t.b);
+
+    // Calculate the maximum delta in the direct neighborhood:
+    float2 maxDelta = max(delta.xy, delta.zw);
+
+    // Calculate left-left and top-top deltas:
+    float3 Cleftleft  = SMAASamplePoint(colorTex, offset[2].xy).rgb;
+    t = abs(C - Cleftleft);
+    delta.z = max(max(t.r, t.g), t.b);
+
+    float3 Ctoptop = SMAASamplePoint(colorTex, offset[2].zw).rgb;
+    t = abs(C - Ctoptop);
+    delta.w = max(max(t.r, t.g), t.b);
+
+    // Calculate the final maximum delta:
+    maxDelta = max(maxDelta.xy, delta.zw);
+    float finalDelta = max(maxDelta.x, maxDelta.y);
+
+    // Local contrast adaptation:
+    edges.xy *= step(finalDelta, SMAA_LOCAL_CONTRAST_ADAPTATION_FACTOR * delta.xy);
+
+    return edges;
+}
+
+/**
+ * Depth Edge Detection
+ */
+float2 SMAADepthEdgeDetectionPS(float2 texcoord,
+                                float4 offset[3],
+                                SMAATexture2D(depthTex)) {
+    float3 neighbours = SMAAGatherNeighbours(texcoord, offset, SMAATexturePass2D(depthTex));
+    float2 delta = abs(neighbours.xx - float2(neighbours.y, neighbours.z));
+    float2 edges = step(SMAA_DEPTH_THRESHOLD, delta);
+
+    if (dot(edges, float2(1.0, 1.0)) == 0.0)
+        discard;
+
+    return edges;
+}
+
+//-----------------------------------------------------------------------------
+// Diagonal Search Functions
+
+#if !defined(SMAA_DISABLE_DIAG_DETECTION)
+
+/**
+ * Allows to decode two binary values from a bilinear-filtered access.
+ */
+float2 SMAADecodeDiagBilinearAccess(float2 e) {
+    // Bilinear access for fetching 'e' have a 0.25 offset, and we are
+    // interested in the R and G edges:
+    //
+    // +---G---+-------+
+    // |   x o R   x   |
+    // +-------+-------+
+    //
+    // Then, if one of these edge is enabled:
+    //   Red:   (0.75 * X + 0.25 * 1) => 0.25 or 1.0
+    //   Green: (0.75 * 1 + 0.25 * X) => 0.75 or 1.0
+    //
+    // This function will unpack the values (mad + mul + round):
+    // wolframalpha.com: round(x * abs(5 * x - 5 * 0.75)) plot 0 to 1
+    e.r = e.r * abs(5.0 * e.r - 5.0 * 0.75);
+    return round(e);
+}
+
+float4 SMAADecodeDiagBilinearAccess(float4 e) {
+    e.rb = e.rb * abs(5.0 * e.rb - 5.0 * 0.75);
+    return round(e);
+}
+
+/**
+ * These functions allows to perform diagonal pattern searches.
+ */
+float2 SMAASearchDiag1(SMAATexture2D(edgesTex), float2 texcoord, float2 dir, out float2 e) {
+    float4 coord = float4(texcoord, -1.0, 1.0);
+    float3 t = float3(SMAA_RT_METRICS.xy, 1.0);
+    while (coord.z < float(SMAA_MAX_SEARCH_STEPS_DIAG - 1) &&
+           coord.w > 0.9) {
+        coord.xyz = mad(t, float3(dir, 1.0), coord.xyz);
+        e = SMAASampleLevelZero(edgesTex, coord.xy).rg;
+        coord.w = dot(e, float2(0.5, 0.5));
+    }
+    return coord.zw;
+}
+
+float2 SMAASearchDiag2(SMAATexture2D(edgesTex), float2 texcoord, float2 dir, out float2 e) {
+    float4 coord = float4(texcoord, -1.0, 1.0);
+    coord.x += 0.25 * SMAA_RT_METRICS.x; // See @SearchDiag2Optimization
+    float3 t = float3(SMAA_RT_METRICS.xy, 1.0);
+    while (coord.z < float(SMAA_MAX_SEARCH_STEPS_DIAG - 1) &&
+           coord.w > 0.9) {
+        coord.xyz = mad(t, float3(dir, 1.0), coord.xyz);
+
+        // @SearchDiag2Optimization
+        // Fetch both edges at once using bilinear filtering:
+        e = SMAASampleLevelZero(edgesTex, coord.xy).rg;
+        e = SMAADecodeDiagBilinearAccess(e);
+
+        // Non-optimized version:
+        // e.g = SMAASampleLevelZero(edgesTex, coord.xy).g;
+        // e.r = SMAASampleLevelZeroOffset(edgesTex, coord.xy, int2(1, 0)).r;
+
+        coord.w = dot(e, float2(0.5, 0.5));
+    }
+    return coord.zw;
+}
+
+/** 
+ * Similar to SMAAArea, this calculates the area corresponding to a certain
+ * diagonal distance and crossing edges 'e'.
+ */
+float2 SMAAAreaDiag(SMAATexture2D(areaTex), float2 dist, float2 e, float offset) {
+    float2 texcoord = mad(float2(SMAA_AREATEX_MAX_DISTANCE_DIAG, SMAA_AREATEX_MAX_DISTANCE_DIAG), e, dist);
+
+    // We do a scale and bias for mapping to texel space:
+    texcoord = mad(SMAA_AREATEX_PIXEL_SIZE, texcoord, 0.5 * SMAA_AREATEX_PIXEL_SIZE);
+
+    // Diagonal areas are on the second half of the texture:
+    texcoord.x += 0.5;
+
+    // Move to proper place, according to the subpixel offset:
+    texcoord.y += SMAA_AREATEX_SUBTEX_SIZE * offset;
+
+    // Do it!
+    return SMAA_AREATEX_SELECT(SMAASampleLevelZero(areaTex, texcoord));
+}
+
+/**
+ * This searches for diagonal patterns and returns the corresponding weights.
+ */
+float2 SMAACalculateDiagWeights(SMAATexture2D(edgesTex), SMAATexture2D(areaTex), float2 texcoord, float2 e, float4 subsampleIndices) {
+    float2 weights = float2(0.0, 0.0);
+
+    // Search for the line ends:
+    float4 d;
+    float2 end;
+    if (e.r > 0.0) {
+        d.xz = SMAASearchDiag1(SMAATexturePass2D(edgesTex), texcoord, float2(-1.0,  1.0), end);
+        d.x += float(end.y > 0.9);
+    } else
+        d.xz = float2(0.0, 0.0);
+    d.yw = SMAASearchDiag1(SMAATexturePass2D(edgesTex), texcoord, float2(1.0, -1.0), end);
+
+    SMAA_BRANCH
+    if (d.x + d.y > 2.0) { // d.x + d.y + 1 > 3
+        // Fetch the crossing edges:
+        float4 coords = mad(float4(-d.x + 0.25, d.x, d.y, -d.y - 0.25), SMAA_RT_METRICS.xyxy, texcoord.xyxy);
+        float4 c;
+        c.xy = SMAASampleLevelZeroOffset(edgesTex, coords.xy, int2(-1,  0)).rg;
+        c.zw = SMAASampleLevelZeroOffset(edgesTex, coords.zw, int2( 1,  0)).rg;
+        c.yxwz = SMAADecodeDiagBilinearAccess(c.xyzw);
+
+        // Non-optimized version:
+        // float4 coords = mad(float4(-d.x, d.x, d.y, -d.y), SMAA_RT_METRICS.xyxy, texcoord.xyxy);
+        // float4 c;
+        // c.x = SMAASampleLevelZeroOffset(edgesTex, coords.xy, int2(-1,  0)).g;
+        // c.y = SMAASampleLevelZeroOffset(edgesTex, coords.xy, int2( 0,  0)).r;
+        // c.z = SMAASampleLevelZeroOffset(edgesTex, coords.zw, int2( 1,  0)).g;
+        // c.w = SMAASampleLevelZeroOffset(edgesTex, coords.zw, int2( 1, -1)).r;
+
+        // Merge crossing edges at each side into a single value:
+        float2 cc = mad(float2(2.0, 2.0), c.xz, c.yw);
+
+        // Remove the crossing edge if we didn't found the end of the line:
+        SMAAMovc(bool2(step(0.9, d.zw)), cc, float2(0.0, 0.0));
+
+        // Fetch the areas for this line:
+        weights += SMAAAreaDiag(SMAATexturePass2D(areaTex), d.xy, cc, subsampleIndices.z);
+    }
+
+    // Search for the line ends:
+    d.xz = SMAASearchDiag2(SMAATexturePass2D(edgesTex), texcoord, float2(-1.0, -1.0), end);
+    if (SMAASampleLevelZeroOffset(edgesTex, texcoord, int2(1, 0)).r > 0.0) {
+        d.yw = SMAASearchDiag2(SMAATexturePass2D(edgesTex), texcoord, float2(1.0, 1.0), end);
+        d.y += float(end.y > 0.9);
+    } else
+        d.yw = float2(0.0, 0.0);
+
+    SMAA_BRANCH
+    if (d.x + d.y > 2.0) { // d.x + d.y + 1 > 3
+        // Fetch the crossing edges:
+        float4 coords = mad(float4(-d.x, -d.x, d.y, d.y), SMAA_RT_METRICS.xyxy, texcoord.xyxy);
+        float4 c;
+        c.x  = SMAASampleLevelZeroOffset(edgesTex, coords.xy, int2(-1,  0)).g;
+        c.y  = SMAASampleLevelZeroOffset(edgesTex, coords.xy, int2( 0, -1)).r;
+        c.zw = SMAASampleLevelZeroOffset(edgesTex, coords.zw, int2( 1,  0)).gr;
+        float2 cc = mad(float2(2.0, 2.0), c.xz, c.yw);
+
+        // Remove the crossing edge if we didn't found the end of the line:
+        SMAAMovc(bool2(step(0.9, d.zw)), cc, float2(0.0, 0.0));
+
+        // Fetch the areas for this line:
+        weights += SMAAAreaDiag(SMAATexturePass2D(areaTex), d.xy, cc, subsampleIndices.w).gr;
+    }
+
+    return weights;
+}
+#endif
+
+//-----------------------------------------------------------------------------
+// Horizontal/Vertical Search Functions
+
+/**
+ * This allows to determine how much length should we add in the last step
+ * of the searches. It takes the bilinearly interpolated edge (see 
+ * @PSEUDO_GATHER4), and adds 0, 1 or 2, depending on which edges and
+ * crossing edges are active.
+ */
+float SMAASearchLength(SMAATexture2D(searchTex), float2 e, float offset) {
+    // The texture is flipped vertically, with left and right cases taking half
+    // of the space horizontally:
+    float2 scale = SMAA_SEARCHTEX_SIZE * float2(0.5, -1.0);
+    float2 bias = SMAA_SEARCHTEX_SIZE * float2(offset, 1.0);
+
+    // Scale and bias to access texel centers:
+    scale += float2(-1.0,  1.0);
+    bias  += float2( 0.5, -0.5);
+
+    // Convert from pixel coordinates to texcoords:
+    // (We use SMAA_SEARCHTEX_PACKED_SIZE because the texture is cropped)
+    scale *= 1.0 / SMAA_SEARCHTEX_PACKED_SIZE;
+    bias *= 1.0 / SMAA_SEARCHTEX_PACKED_SIZE;
+
+    // Lookup the search texture:
+    return SMAA_SEARCHTEX_SELECT(SMAASampleLevelZero(searchTex, mad(scale, e, bias)));
+}
+
+/**
+ * Horizontal/vertical search functions for the 2nd pass.
+ */
+float SMAASearchXLeft(SMAATexture2D(edgesTex), SMAATexture2D(searchTex), float2 texcoord, float end) {
+    /**
+     * @PSEUDO_GATHER4
+     * This texcoord has been offset by (-0.25, -0.125) in the vertex shader to
+     * sample between edge, thus fetching four edges in a row.
+     * Sampling with different offsets in each direction allows to disambiguate
+     * which edges are active from the four fetched ones.
+     */
+    float2 e = float2(0.0, 1.0);
+    while (texcoord.x > end && 
+           e.g > 0.8281 && // Is there some edge not activated?
+           e.r == 0.0) { // Or is there a crossing edge that breaks the line?
+        e = SMAASampleLevelZero(edgesTex, texcoord).rg;
+        texcoord = mad(-float2(2.0, 0.0), SMAA_RT_METRICS.xy, texcoord);
+    }
+
+    float offset = mad(-(255.0 / 127.0), SMAASearchLength(SMAATexturePass2D(searchTex), e, 0.0), 3.25);
+    return mad(SMAA_RT_METRICS.x, offset, texcoord.x);
+
+    // Non-optimized version:
+    // We correct the previous (-0.25, -0.125) offset we applied:
+    // texcoord.x += 0.25 * SMAA_RT_METRICS.x;
+
+    // The searches are bias by 1, so adjust the coords accordingly:
+    // texcoord.x += SMAA_RT_METRICS.x;
+
+    // Disambiguate the length added by the last step:
+    // texcoord.x += 2.0 * SMAA_RT_METRICS.x; // Undo last step
+    // texcoord.x -= SMAA_RT_METRICS.x * (255.0 / 127.0) * SMAASearchLength(SMAATexturePass2D(searchTex), e, 0.0);
+    // return mad(SMAA_RT_METRICS.x, offset, texcoord.x);
+}
+
+float SMAASearchXRight(SMAATexture2D(edgesTex), SMAATexture2D(searchTex), float2 texcoord, float end) {
+    float2 e = float2(0.0, 1.0);
+    while (texcoord.x < end && 
+           e.g > 0.8281 && // Is there some edge not activated?
+           e.r == 0.0) { // Or is there a crossing edge that breaks the line?
+        e = SMAASampleLevelZero(edgesTex, texcoord).rg;
+        texcoord = mad(float2(2.0, 0.0), SMAA_RT_METRICS.xy, texcoord);
+    }
+    float offset = mad(-(255.0 / 127.0), SMAASearchLength(SMAATexturePass2D(searchTex), e, 0.5), 3.25);
+    return mad(-SMAA_RT_METRICS.x, offset, texcoord.x);
+}
+
+float SMAASearchYUp(SMAATexture2D(edgesTex), SMAATexture2D(searchTex), float2 texcoord, float end) {
+    float2 e = float2(1.0, 0.0);
+    while (texcoord.y > end && 
+           e.r > 0.8281 && // Is there some edge not activated?
+           e.g == 0.0) { // Or is there a crossing edge that breaks the line?
+        e = SMAASampleLevelZero(edgesTex, texcoord).rg;
+        texcoord = mad(-float2(0.0, 2.0), SMAA_RT_METRICS.xy, texcoord);
+    }
+    float offset = mad(-(255.0 / 127.0), SMAASearchLength(SMAATexturePass2D(searchTex), e.gr, 0.0), 3.25);
+    return mad(SMAA_RT_METRICS.y, offset, texcoord.y);
+}
+
+float SMAASearchYDown(SMAATexture2D(edgesTex), SMAATexture2D(searchTex), float2 texcoord, float end) {
+    float2 e = float2(1.0, 0.0);
+    while (texcoord.y < end && 
+           e.r > 0.8281 && // Is there some edge not activated?
+           e.g == 0.0) { // Or is there a crossing edge that breaks the line?
+        e = SMAASampleLevelZero(edgesTex, texcoord).rg;
+        texcoord = mad(float2(0.0, 2.0), SMAA_RT_METRICS.xy, texcoord);
+    }
+    float offset = mad(-(255.0 / 127.0), SMAASearchLength(SMAATexturePass2D(searchTex), e.gr, 0.5), 3.25);
+    return mad(-SMAA_RT_METRICS.y, offset, texcoord.y);
+}
+
+/** 
+ * Ok, we have the distance and both crossing edges. So, what are the areas
+ * at each side of current edge?
+ */
+float2 SMAAArea(SMAATexture2D(areaTex), float2 dist, float e1, float e2, float offset) {
+    // Rounding prevents precision errors of bilinear filtering:
+    float2 texcoord = mad(float2(SMAA_AREATEX_MAX_DISTANCE, SMAA_AREATEX_MAX_DISTANCE), round(4.0 * float2(e1, e2)), dist);
+    
+    // We do a scale and bias for mapping to texel space:
+    texcoord = mad(SMAA_AREATEX_PIXEL_SIZE, texcoord, 0.5 * SMAA_AREATEX_PIXEL_SIZE);
+
+    // Move to proper place, according to the subpixel offset:
+    texcoord.y = mad(SMAA_AREATEX_SUBTEX_SIZE, offset, texcoord.y);
+
+    // Do it!
+    return SMAA_AREATEX_SELECT(SMAASampleLevelZero(areaTex, texcoord));
+}
+
+//-----------------------------------------------------------------------------
+// Corner Detection Functions
+
+void SMAADetectHorizontalCornerPattern(SMAATexture2D(edgesTex), inout float2 weights, float4 texcoord, float2 d) {
+    #if !defined(SMAA_DISABLE_CORNER_DETECTION)
+    float2 leftRight = step(d.xy, d.yx);
+    float2 rounding = (1.0 - SMAA_CORNER_ROUNDING_NORM) * leftRight;
+
+    rounding /= leftRight.x + leftRight.y; // Reduce blending for pixels in the center of a line.
+
+    float2 factor = float2(1.0, 1.0);
+    factor.x -= rounding.x * SMAASampleLevelZeroOffset(edgesTex, texcoord.xy, int2(0,  1)).r;
+    factor.x -= rounding.y * SMAASampleLevelZeroOffset(edgesTex, texcoord.zw, int2(1,  1)).r;
+    factor.y -= rounding.x * SMAASampleLevelZeroOffset(edgesTex, texcoord.xy, int2(0, -2)).r;
+    factor.y -= rounding.y * SMAASampleLevelZeroOffset(edgesTex, texcoord.zw, int2(1, -2)).r;
+
+    weights *= saturate(factor);
+    #endif
+}
+
+void SMAADetectVerticalCornerPattern(SMAATexture2D(edgesTex), inout float2 weights, float4 texcoord, float2 d) {
+    #if !defined(SMAA_DISABLE_CORNER_DETECTION)
+    float2 leftRight = step(d.xy, d.yx);
+    float2 rounding = (1.0 - SMAA_CORNER_ROUNDING_NORM) * leftRight;
+
+    rounding /= leftRight.x + leftRight.y;
+
+    float2 factor = float2(1.0, 1.0);
+    factor.x -= rounding.x * SMAASampleLevelZeroOffset(edgesTex, texcoord.xy, int2( 1, 0)).g;
+    factor.x -= rounding.y * SMAASampleLevelZeroOffset(edgesTex, texcoord.zw, int2( 1, 1)).g;
+    factor.y -= rounding.x * SMAASampleLevelZeroOffset(edgesTex, texcoord.xy, int2(-2, 0)).g;
+    factor.y -= rounding.y * SMAASampleLevelZeroOffset(edgesTex, texcoord.zw, int2(-2, 1)).g;
+
+    weights *= saturate(factor);
+    #endif
+}
+
+
+void main() {
+    // gl_FragColor = vec4(col);
+}

raw/smaa_pass/smaa_edge_detect.vert.glsl

@@ -0,0 +1,27 @@
+#version 450
+
+#ifdef GL_ES
+precision highp float;
+#endif
+
+in vec2 pos;
+
+out vec2 texCoord;
+
+const vec2 madd = vec2(0.5, 0.5);
+
+
+// Edge Detection Vertex Shader
+void SMAAEdgeDetectionVS(float2 texcoord, out float4 offset[3]) {
+    offset[0] = mad(SMAA_RT_METRICS.xyxy, float4(-1.0, 0.0, 0.0, -1.0), texcoord.xyxy);
+    offset[1] = mad(SMAA_RT_METRICS.xyxy, float4( 1.0, 0.0, 0.0,  1.0), texcoord.xyxy);
+    offset[2] = mad(SMAA_RT_METRICS.xyxy, float4(-2.0, 0.0, 0.0, -2.0), texcoord.xyxy);
+}
+
+
+void main() {
+  // Scale vertex attribute to [0-1] range
+  texCoord = pos.xy * madd + madd;
+
+  gl_Position = vec4(pos.xy, 0.0, 1.0);
+}

raw/smaa_pass/smaa_neighborhood_blending.frag.glsl

@@ -0,0 +1,77 @@
+#version 450
+
+#ifdef GL_ES
+precision mediump float;
+#endif
+
+
+uniform sampler2D tex;
+
+in vec2 texCoord;
+
+
+//-----------------------------------------------------------------------------
+// Neighborhood Blending Pixel Shader (Third Pass)
+
+float4 SMAANeighborhoodBlendingPS(float2 texcoord,
+                                  float4 offset,
+                                  SMAATexture2D(colorTex),
+                                  SMAATexture2D(blendTex)
+                                  #if SMAA_REPROJECTION
+                                  , SMAATexture2D(velocityTex)
+                                  #endif
+                                  ) {
+    // Fetch the blending weights for current pixel:
+    float4 a;
+    a.x = SMAASample(blendTex, offset.xy).a; // Right
+    a.y = SMAASample(blendTex, offset.zw).g; // Top
+    a.wz = SMAASample(blendTex, texcoord).xz; // Bottom / Left
+
+    // Is there any blending weight with a value greater than 0.0?
+    SMAA_BRANCH
+    if (dot(a, float4(1.0, 1.0, 1.0, 1.0)) < 1e-5) {
+        float4 color = SMAASampleLevelZero(colorTex, texcoord);
+
+        #if SMAA_REPROJECTION
+        float2 velocity = SMAA_DECODE_VELOCITY(SMAASampleLevelZero(velocityTex, texcoord));
+
+        // Pack velocity into the alpha channel:
+        color.a = sqrt(5.0 * length(velocity));
+        #endif
+
+        return color;
+    } else {
+        bool h = max(a.x, a.z) > max(a.y, a.w); // max(horizontal) > max(vertical)
+
+        // Calculate the blending offsets:
+        float4 blendingOffset = float4(0.0, a.y, 0.0, a.w);
+        float2 blendingWeight = a.yw;
+        SMAAMovc(bool4(h, h, h, h), blendingOffset, float4(a.x, 0.0, a.z, 0.0));
+        SMAAMovc(bool2(h, h), blendingWeight, a.xz);
+        blendingWeight /= dot(blendingWeight, float2(1.0, 1.0));
+
+        // Calculate the texture coordinates:
+        float4 blendingCoord = mad(blendingOffset, float4(SMAA_RT_METRICS.xy, -SMAA_RT_METRICS.xy), texcoord.xyxy);
+
+        // We exploit bilinear filtering to mix current pixel with the chosen
+        // neighbor:
+        float4 color = blendingWeight.x * SMAASampleLevelZero(colorTex, blendingCoord.xy);
+        color += blendingWeight.y * SMAASampleLevelZero(colorTex, blendingCoord.zw);
+
+        #if SMAA_REPROJECTION
+        // Antialias velocity for proper reprojection in a later stage:
+        float2 velocity = blendingWeight.x * SMAA_DECODE_VELOCITY(SMAASampleLevelZero(velocityTex, blendingCoord.xy));
+        velocity += blendingWeight.y * SMAA_DECODE_VELOCITY(SMAASampleLevelZero(velocityTex, blendingCoord.zw));
+
+        // Pack velocity into the alpha channel:
+        color.a = sqrt(5.0 * length(velocity));
+        #endif
+
+        return color;
+    }
+}
+
+
+void main() {
+    // gl_FragColor = vec4(col);
+}

raw/smaa_pass/smaa_neighborhood_blending.vert.glsl

@@ -0,0 +1,25 @@
+#version 450
+
+#ifdef GL_ES
+precision highp float;
+#endif
+
+in vec2 pos;
+
+out vec2 texCoord;
+
+const vec2 madd = vec2(0.5, 0.5);
+
+
+// Neighborhood Blending Vertex Shader
+void SMAANeighborhoodBlendingVS(float2 texcoord, out float4 offset) {
+    offset = mad(SMAA_RT_METRICS.xyxy, float4( 1.0, 0.0, 0.0,  1.0), texcoord.xyxy);
+}
+
+
+void main() {
+  // Scale vertex attribute to [0-1] range
+  texCoord = pos.xy * madd + madd;
+
+  gl_Position = vec4(pos.xy, 0.0, 1.0);
+}

raw/smaa_pass/smaa_pass.frag.glsl

@@ -0,0 +1,164 @@
+/**
+ * Copyright (C) 2013 Jorge Jimenez (jorge@iryoku.com)
+ * Copyright (C) 2013 Jose I. Echevarria (joseignacioechevarria@gmail.com)
+ * Copyright (C) 2013 Belen Masia (bmasia@unizar.es)
+ * Copyright (C) 2013 Fernando Navarro (fernandn@microsoft.com)
+ * Copyright (C) 2013 Diego Gutierrez (diegog@unizar.es)
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
+ * of the Software, and to permit persons to whom the Software is furnished to
+ * do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software. As clarification, there
+ * is no requirement that the copyright notice and permission be included in
+ * binary distributions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+
+/**
+ *                  _______  ___  ___       ___           ___
+ *                 /       ||   \/   |     /   \         /   \
+ *                |   (---- |  \  /  |    /  ^  \       /  ^  \
+ *                 \   \    |  |\/|  |   /  /_\  \     /  /_\  \
+ *              ----)   |   |  |  |  |  /  _____  \   /  _____  \
+ *             |_______/    |__|  |__| /__/     \__\ /__/     \__\
+ * 
+ *                               E N H A N C E D
+ *       S U B P I X E L   M O R P H O L O G I C A L   A N T I A L I A S I N G
+ *
+ *                         http://www.iryoku.com/smaa/
+ */
+
+#version 450
+
+#ifdef GL_ES
+precision mediump float;
+#endif
+
+#define SMAA_RT_METRICS vec4(1.0 / 800.0, 1.0 / 600.0, 800.0, 600.0)
+// #define SMAA_GLSL_3
+#define SMAA_PRESET_HIGH
+// #include "SMAA.h"
+
+// #define SMAA_AREATEX_SELECT(sample) sample.rg
+// #define SMAA_SEARCHTEX_SELECT(sample) sample.r
+// #define SMAA_DECODE_VELOCITY(sample) sample.rg
+
+// #if defined(SMAA_PRESET_LOW)
+// #define SMAA_THRESHOLD 0.15
+// #define SMAA_MAX_SEARCH_STEPS 4
+// #define SMAA_DISABLE_DIAG_DETECTION
+// #define SMAA_DISABLE_CORNER_DETECTION
+// #elif defined(SMAA_PRESET_MEDIUM)
+// #define SMAA_THRESHOLD 0.1
+// #define SMAA_MAX_SEARCH_STEPS 8
+// #define SMAA_DISABLE_DIAG_DETECTION
+// #define SMAA_DISABLE_CORNER_DETECTION
+// #elif defined(SMAA_PRESET_HIGH)
+#define SMAA_THRESHOLD 0.1
+#define SMAA_DEPTH_THRESHOLD (0.1 * SMAA_THRESHOLD) // For depth edge detection, depends on the depth range of the scene
+#define SMAA_MAX_SEARCH_STEPS 16
+// Define SMAA_DISABLE_DIAG_DETECTION to disable diagonal processing
+#define SMAA_MAX_SEARCH_STEPS_DIAG 8
+// Define SMAA_DISABLE_CORNER_DETECTION to disable corner processing
+#define SMAA_CORNER_ROUNDING 25
+// If there is an neighbor edge that has SMAA_LOCAL_CONTRAST_FACTOR times bigger contrast than current edge, current edge will be discarded
+#define SMAA_LOCAL_CONTRAST_ADAPTATION_FACTOR 2.0
+// Predicated thresholding allows to better preserve texture details and to improve performance
+#define SMAA_PREDICATION 0
+// Threshold to be used in the additional predication buffer
+#define SMAA_PREDICATION_THRESHOLD 0.01
+// How much to scale the global threshold used for luma or color edge detection when using predication
+#define SMAA_PREDICATION_SCALE 2.0
+// How much to locally decrease the threshold
+#define SMAA_PREDICATION_STRENGTH 0.4
+// Temporal reprojection allows to remove ghosting artifacts when using temporal supersampling
+#define SMAA_REPROJECTION 0
+// SMAA_REPROJECTION_WEIGHT_SCALE controls the velocity weighting
+#define SMAA_REPROJECTION_WEIGHT_SCALE 30.0
+// #elif defined(SMAA_PRESET_ULTRA)
+// #define SMAA_THRESHOLD 0.05
+// #define SMAA_MAX_SEARCH_STEPS 32
+// #define SMAA_MAX_SEARCH_STEPS_DIAG 16
+// #define SMAA_CORNER_ROUNDING 25
+// #endif
+
+// Non-Configurable Defines
+#define SMAA_AREATEX_MAX_DISTANCE 16
+#define SMAA_AREATEX_MAX_DISTANCE_DIAG 20
+#define SMAA_AREATEX_PIXEL_SIZE (1.0 / vec2(160.0, 560.0))
+#define SMAA_AREATEX_SUBTEX_SIZE (1.0 / 7.0)
+#define SMAA_SEARCHTEX_SIZE vec2(66.0, 33.0)
+#define SMAA_SEARCHTEX_PACKED_SIZE vec2(64.0, 16.0)
+#define SMAA_CORNER_ROUNDING_NORM (float(SMAA_CORNER_ROUNDING) / 100.0)
+
+#define SMAA_FLATTEN
+#define SMAA_BRANCH
+// #define lerp(a, b, t) mix(a, b, t)
+// #define saturate(a) clamp(a, 0.0, 1.0)
+// #define mad(a, b, c) (a * b + c)
+
+uniform sampler2D tex;
+
+in vec2 texCoord;
+
+
+
+//-----------------------------------------------------------------------------
+// Misc functions
+// Gathers current pixel, and the top-left neighbors.
+float3 SMAAGatherNeighbours(float2 texcoord,
+                            float4 offset[3],
+                            SMAATexture2D(tex)) {
+    #ifdef SMAAGather
+    return SMAAGather(tex, texcoord + SMAA_RT_METRICS.xy * float2(-0.5, -0.5)).grb;
+    #else
+    float P = SMAASamplePoint(tex, texcoord).r;
+    float Pleft = SMAASamplePoint(tex, offset[0].xy).r;
+    float Ptop  = SMAASamplePoint(tex, offset[0].zw).r;
+    return float3(P, Pleft, Ptop);
+    #endif
+}
+
+// Adjusts the threshold by means of predication.
+float2 SMAACalculatePredicatedThreshold(float2 texcoord,
+                                        float4 offset[3],
+                                        SMAATexture2D(predicationTex)) {
+    float3 neighbours = SMAAGatherNeighbours(texcoord, offset, SMAATexturePass2D(predicationTex));
+    float2 delta = abs(neighbours.xx - neighbours.yz);
+    float2 edges = step(SMAA_PREDICATION_THRESHOLD, delta);
+    return SMAA_PREDICATION_SCALE * SMAA_THRESHOLD * (1.0 - SMAA_PREDICATION_STRENGTH * edges);
+}
+
+// Conditional move:
+void SMAAMovc(bool2 cond, inout float2 variable, float2 value) {
+    SMAA_FLATTEN if (cond.x) variable.x = value.x;
+    SMAA_FLATTEN if (cond.y) variable.y = value.y;
+}
+void SMAAMovc(bool4 cond, inout float4 variable, float4 value) {
+    SMAAMovc(cond.xy, variable.xy, value.xy);
+    SMAAMovc(cond.zw, variable.zw, value.zw);
+}
+
+
+
+
+
+
+
+
+void main() {
+    // gl_FragColor = vec4(col);
+}

raw/smaa_pass/smaa_pass.shader.json

@@ -0,0 +1,25 @@
+{
+	"contexts": [
+		{
+			"id": "smaa_pass",
+			"params": [
+				{
+					"id": "depth_write",
+					"value": "true"
+				},
+				{
+					"id": "compare_mode",
+					"value": "always"
+				},
+				{
+					"id": "cull_mode",
+					"value": "none"
+				}
+			],
+			"links": [],
+			"texture_params": [],
+			"vertex_shader": "smaa_pass.vert.glsl",
+			"fragment_shader": "smaa_pass.frag.glsl"
+		}
+	]
+}

raw/smaa_pass/smaa_pass.vert.glsl

@@ -0,0 +1,18 @@
+#version 450
+
+#ifdef GL_ES
+precision highp float;
+#endif
+
+in vec2 pos;
+
+out vec2 texCoord;
+
+const vec2 madd = vec2(0.5, 0.5);
+
+void main() {
+  // Scale vertex attribute to [0-1] range
+  texCoord = pos.xy * madd + madd;
+
+  gl_Position = vec4(pos.xy, 0.0, 1.0);
+}

raw/smaa_pass/smaa_separate_multisamples.frag.glsl

@@ -0,0 +1,29 @@
+#version 450
+
+#ifdef GL_ES
+precision mediump float;
+#endif
+
+uniform sampler2D tex;
+
+in vec2 texCoord;
+
+
+// Separate Multisamples Pixel Shader (Optional Pass)
+
+#ifdef SMAALoad
+void SMAASeparatePS(float4 position,
+                    float2 texcoord,
+                    out float4 target0,
+                    out float4 target1,
+                    SMAATexture2DMS2(colorTexMS)) {
+    int2 pos = int2(position.xy);
+    target0 = SMAALoad(colorTexMS, pos, 0);
+    target1 = SMAALoad(colorTexMS, pos, 1);
+}
+#endif
+
+
+void main() {
+    // gl_FragColor = vec4(col);
+}

raw/smaa_pass/smaa_temporal_resolve.frag.glsl

@@ -0,0 +1,49 @@
+#version 450
+
+#ifdef GL_ES
+precision mediump float;
+#endif
+
+uniform sampler2D tex;
+
+in vec2 texCoord;
+
+
+// Temporal Resolve Pixel Shader (Optional Pass)
+
+float4 SMAAResolvePS(float2 texcoord,
+                     SMAATexture2D(currentColorTex),
+                     SMAATexture2D(previousColorTex)
+                     #if SMAA_REPROJECTION
+                     , SMAATexture2D(velocityTex)
+                     #endif
+                     ) {
+    #if SMAA_REPROJECTION
+    // Velocity is assumed to be calculated for motion blur, so we need to
+    // inverse it for reprojection:
+    float2 velocity = -SMAA_DECODE_VELOCITY(SMAASamplePoint(velocityTex, texcoord).rg);
+
+    // Fetch current pixel:
+    float4 current = SMAASamplePoint(currentColorTex, texcoord);
+
+    // Reproject current coordinates and fetch previous pixel:
+    float4 previous = SMAASamplePoint(previousColorTex, texcoord + velocity);
+
+    // Attenuate the previous pixel if the velocity is different:
+    float delta = abs(current.a * current.a - previous.a * previous.a) / 5.0;
+    float weight = 0.5 * saturate(1.0 - sqrt(delta) * SMAA_REPROJECTION_WEIGHT_SCALE);
+
+    // Blend the pixels according to the calculated weight:
+    return lerp(current, previous, weight);
+    #else
+    // Just blend the pixels:
+    float4 current = SMAASamplePoint(currentColorTex, texcoord);
+    float4 previous = SMAASamplePoint(previousColorTex, texcoord);
+    return lerp(current, previous, 0.5);
+    #endif
+}
+
+
+void main() {
+    // gl_FragColor = vec4(col);
+}