vulkan: Add a clip.frag.glsl include

This include is supposed to handle clipping for the different clipping
methods.

So far, we only use it in the rounded rect cases.

gsk/Makefile.am

@@ -58,6 +58,7 @@ gsk_private_vulkan_source_c = \
 	gskvulkanrenderpass.c \
 	gskvulkanshader.c
 gsk_private_vulkan_include_shaders = \
+	resources/vulkan/clip.frag.glsl \
 	resources/vulkan/constants.glsl \
 	resources/vulkan/rounded-rect.glsl
 gsk_private_vulkan_shaders = \

gsk/resources/vulkan/blend-clip-rounded.frag.glsl

@@ -1,11 +1,7 @@
 #version 420 core
 
-#include "constants.glsl"
-
-struct RoundedRect {
-  vec4 bounds;
-  vec4 corners;
-};
+#define CLIP_ROUNDED_RECT
+#include "clip.frag.glsl"
 
 layout(location = 0) in vec2 inPos;
 layout(location = 1) in vec2 inTexCoord;
@@ -14,44 +10,7 @@ layout(set = 0, binding = 0) uniform sampler2D inTexture;
 
 layout(location = 0) out vec4 color;
 
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-float clip(vec2 pos, RoundedRect r) {
-  vec2 ref_tl = r.bounds.xy + vec2( r.corners.x,  r.corners.x);
-  vec2 ref_tr = r.bounds.zy + vec2(-r.corners.y,  r.corners.y);
-  vec2 ref_br = r.bounds.zw + vec2(-r.corners.z, -r.corners.z);
-  vec2 ref_bl = r.bounds.xw + vec2( r.corners.w, -r.corners.w);
-  
-  float d_tl = distance(pos, ref_tl);
-  float d_tr = distance(pos, ref_tr);
-  float d_br = distance(pos, ref_br);
-  float d_bl = distance(pos, ref_bl);
-
-  float pixels_per_fragment = length(fwidth(pos.xy));
-  float nudge = 0.5 * pixels_per_fragment;
-  vec4 distances = vec4(d_tl, d_tr, d_br, d_bl) - r.corners + nudge;
-
-  bvec4 is_out = bvec4(pos.x < ref_tl.x && pos.y < ref_tl.y,
-                       pos.x > ref_tr.x && pos.y < ref_tr.y,
-                       pos.x > ref_br.x && pos.y > ref_br.y,
-                       pos.x < ref_bl.x && pos.y > ref_bl.y);
-
-  float distance_from_border = dot(vec4(is_out),
-                                   max(vec4(0.0, 0.0, 0.0, 0.0), distances));
-
-  // Move the distance back into pixels.
-  distance_from_border /= pixels_per_fragment;
-  // Apply a more gradual fade out to transparent.
-  //distance_from_border -= 0.5;
-
-  return 1.0 - smoothstep(0.0, 1.0, distance_from_border);
-}
-
 void main()
 {
-  RoundedRect r = RoundedRect(vec4(push.clip_bounds.xy, push.clip_bounds.xy + push.clip_bounds.zw), push.clip_widths);
-
-  color = texture (inTexture, inTexCoord) * clip (inPos, r);
+  color = clip (inPos, texture (inTexture, inTexCoord));
 }

gsk/resources/vulkan/clip.frag.glsl

@@ -0,0 +1,29 @@
+#include "constants.glsl"
+#include "rounded-rect.glsl"
+
+#ifndef _CLIP_
+#define _CLIP_
+
+#ifdef CLIP_ROUNDED_RECT
+vec4 clip(vec2 pos, vec4 color)
+{
+  RoundedRect r = RoundedRect(vec4(push.clip_bounds.xy, push.clip_bounds.xy + push.clip_bounds.zw), push.clip_widths, push.clip_heights);
+
+  return color * rounded_rect_coverage (r, pos);
+}
+#elif defined(CLIP_RECT)
+vec4 clip(vec2 pos, vec4 color)
+{
+  /* clipped in vertex shader already */
+  return color;
+}
+#elif defined(CLIP_NONE)
+vec4 clip(vec2 pos, vec4 color)
+{
+  return color;
+}
+#else
+#error "No clipping define given. Need CLIP_NONE, CLIP_RECT or CLIP_ROUNDED_RECT"
+#endif
+
+#endif

gsk/resources/vulkan/color-clip-rounded.frag.glsl

@@ -1,56 +1,14 @@
 #version 420 core
 
-#include "constants.glsl"
+#define CLIP_ROUNDED_RECT
+#include "clip.frag.glsl"
 
 layout(location = 0) in vec2 inPos;
 layout(location = 1) in vec4 inColor;
 
 layout(location = 0) out vec4 color;
 
-struct RoundedRect {
-  vec4 bounds;
-  vec4 corners;
-};
-
-
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-float clip(vec2 pos, RoundedRect r) {
-  vec2 ref_tl = r.bounds.xy + vec2( r.corners.x,  r.corners.x);
-  vec2 ref_tr = r.bounds.zy + vec2(-r.corners.y,  r.corners.y);
-  vec2 ref_br = r.bounds.zw + vec2(-r.corners.z, -r.corners.z);
-  vec2 ref_bl = r.bounds.xw + vec2( r.corners.w, -r.corners.w);
-  
-  float d_tl = distance(pos, ref_tl);
-  float d_tr = distance(pos, ref_tr);
-  float d_br = distance(pos, ref_br);
-  float d_bl = distance(pos, ref_bl);
-
-  float pixels_per_fragment = length(fwidth(pos.xy));
-  float nudge = 0.5 * pixels_per_fragment;
-  vec4 distances = vec4(d_tl, d_tr, d_br, d_bl) - r.corners + nudge;
-
-  bvec4 is_out = bvec4(pos.x < ref_tl.x && pos.y < ref_tl.y,
-                       pos.x > ref_tr.x && pos.y < ref_tr.y,
-                       pos.x > ref_br.x && pos.y > ref_br.y,
-                       pos.x < ref_bl.x && pos.y > ref_bl.y);
-
-  float distance_from_border = dot(vec4(is_out),
-                                   max(vec4(0.0, 0.0, 0.0, 0.0), distances));
-
-  // Move the distance back into pixels.
-  distance_from_border /= pixels_per_fragment;
-  // Apply a more gradual fade out to transparent.
-  //distance_from_border -= 0.5;
-
-  return 1.0 - smoothstep(0.0, 1.0, distance_from_border);
-}
-
 void main()
 {
-  RoundedRect r = RoundedRect(vec4(push.clip_bounds.xy, push.clip_bounds.xy + push.clip_bounds.zw), push.clip_widths);
-
-  color = vec4(inColor.rgb * inColor.a, inColor.a) * clip (inPos, r);
+  color = clip (inPos, vec4(inColor.rgb * inColor.a, inColor.a));
 }

gsk/resources/vulkan/color-matrix-clip-rounded.frag.glsl

@@ -1,11 +1,7 @@
 #version 420 core
 
-#include "constants.glsl"
-
-struct RoundedRect {
-  vec4 bounds;
-  vec4 corners;
-};
+#define CLIP_ROUNDED_RECT
+#include "clip.frag.glsl"
 
 layout(location = 0) in vec2 inPos;
 layout(location = 1) in vec2 inTexCoord;
@@ -16,41 +12,6 @@ layout(set = 0, binding = 0) uniform sampler2D inTexture;
 
 layout(location = 0) out vec4 color;
 
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-float clip(vec2 pos, RoundedRect r) {
-  vec2 ref_tl = r.bounds.xy + vec2( r.corners.x,  r.corners.x);
-  vec2 ref_tr = r.bounds.zy + vec2(-r.corners.y,  r.corners.y);
-  vec2 ref_br = r.bounds.zw + vec2(-r.corners.z, -r.corners.z);
-  vec2 ref_bl = r.bounds.xw + vec2( r.corners.w, -r.corners.w);
-  
-  float d_tl = distance(pos, ref_tl);
-  float d_tr = distance(pos, ref_tr);
-  float d_br = distance(pos, ref_br);
-  float d_bl = distance(pos, ref_bl);
-
-  float pixels_per_fragment = length(fwidth(pos.xy));
-  float nudge = 0.5 * pixels_per_fragment;
-  vec4 distances = vec4(d_tl, d_tr, d_br, d_bl) - r.corners + nudge;
-
-  bvec4 is_out = bvec4(pos.x < ref_tl.x && pos.y < ref_tl.y,
-                       pos.x > ref_tr.x && pos.y < ref_tr.y,
-                       pos.x > ref_br.x && pos.y > ref_br.y,
-                       pos.x < ref_bl.x && pos.y > ref_bl.y);
-
-  float distance_from_border = dot(vec4(is_out),
-                                   max(vec4(0.0, 0.0, 0.0, 0.0), distances));
-
-  // Move the distance back into pixels.
-  distance_from_border /= pixels_per_fragment;
-  // Apply a more gradual fade out to transparent.
-  //distance_from_border -= 0.5;
-
-  return 1.0 - smoothstep(0.0, 1.0, distance_from_border);
-}
-
 vec4
 color_matrix (vec4 color, mat4 color_matrix, vec4 color_offset)
 {
@@ -70,7 +31,5 @@ color_matrix (vec4 color, mat4 color_matrix, vec4 color_offset)
 
 void main()
 {
-  RoundedRect r = RoundedRect(vec4(push.clip_bounds.xy, push.clip_bounds.xy + push.clip_bounds.zw), push.clip_widths);
-
-  color = color_matrix (texture (inTexture, inTexCoord), inColorMatrix, inColorOffset) * clip (inPos, r);
+  color = clip (inPos, color_matrix (texture (inTexture, inTexCoord), inColorMatrix, inColorOffset));
 }

gsk/resources/vulkan/linear-clip-rounded.frag.glsl

@@ -1,17 +1,13 @@
 #version 420 core
 
-#include "constants.glsl"
+#define CLIP_ROUNDED_RECT
+#include "clip.frag.glsl"
 
 struct ColorStop {
   float offset;
   vec4 color;
 };
 
-struct RoundedRect {
-  vec4 bounds;
-  vec4 corners;
-};
-
 layout(location = 0) in vec2 inPos;
 layout(location = 1) in float inGradientPos;
 layout(location = 2) in flat int inRepeating;
@@ -20,45 +16,8 @@ layout(location = 4) in flat ColorStop inStops[8];
 
 layout(location = 0) out vec4 outColor;
 
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-float clip(vec2 pos, RoundedRect r) {
-  vec2 ref_tl = r.bounds.xy + vec2( r.corners.x,  r.corners.x);
-  vec2 ref_tr = r.bounds.zy + vec2(-r.corners.y,  r.corners.y);
-  vec2 ref_br = r.bounds.zw + vec2(-r.corners.z, -r.corners.z);
-  vec2 ref_bl = r.bounds.xw + vec2( r.corners.w, -r.corners.w);
-  
-  float d_tl = distance(pos, ref_tl);
-  float d_tr = distance(pos, ref_tr);
-  float d_br = distance(pos, ref_br);
-  float d_bl = distance(pos, ref_bl);
-
-  float pixels_per_fragment = length(fwidth(pos.xy));
-  float nudge = 0.5 * pixels_per_fragment;
-  vec4 distances = vec4(d_tl, d_tr, d_br, d_bl) - r.corners + nudge;
-
-  bvec4 is_out = bvec4(pos.x < ref_tl.x && pos.y < ref_tl.y,
-                       pos.x > ref_tr.x && pos.y < ref_tr.y,
-                       pos.x > ref_br.x && pos.y > ref_br.y,
-                       pos.x < ref_bl.x && pos.y > ref_bl.y);
-
-  float distance_from_border = dot(vec4(is_out),
-                                   max(vec4(0.0, 0.0, 0.0, 0.0), distances));
-
-  // Move the distance back into pixels.
-  distance_from_border /= pixels_per_fragment;
-  // Apply a more gradual fade out to transparent.
-  //distance_from_border -= 0.5;
-
-  return 1.0 - smoothstep(0.0, 1.0, distance_from_border);
-}
-
 void main()
 {
-  RoundedRect r = RoundedRect(vec4(push.clip_bounds.xy, push.clip_bounds.xy + push.clip_bounds.zw), push.clip_widths);
-
   float pos;
   if (inRepeating != 0)
     pos = fract (inGradientPos);
@@ -74,5 +33,5 @@ void main()
     }
   
   //outColor = vec4(pos, pos, pos, 1.0);
-  outColor = color * clip (inPos, r);
+  outColor = clip (inPos, color);
 }