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[gtk+] A somewhat working blur shader

commit 7bb5b8df0bc8fc0d5b7958ec522d9a9b5b441e18
Author: Matthias Clasen <mclasen redhat com>
Date:   Sun Sep 3 09:54:47 2017 -0400

    A somewhat working blur shader
    
    This is a very direct implementation of a Gaussian blur,
    without any optimizations.

 gsk/gskvulkanblurpipeline.c                     |  129 +++++++++++++++++++++++
 gsk/gskvulkanblurpipelineprivate.h              |   32 ++++++
 gsk/gskvulkanrender.c                           |    4 +
 gsk/gskvulkanrenderpass.c                       |   78 ++++++++++++++
 gsk/gskvulkanrenderprivate.h                    |    3 +
 gsk/meson.build                                 |    1 +
 gsk/resources/vulkan/blur-clip-rounded.frag.spv |  Bin 0 -> 10812 bytes
 gsk/resources/vulkan/blur-clip-rounded.vert.spv |  Bin 0 -> 5172 bytes
 gsk/resources/vulkan/blur-clip.frag.spv         |  Bin 0 -> 4068 bytes
 gsk/resources/vulkan/blur-clip.vert.spv         |  Bin 0 -> 5172 bytes
 gsk/resources/vulkan/blur.frag                  |   50 +++++++++
 gsk/resources/vulkan/blur.frag.glsl             |   13 +++
 gsk/resources/vulkan/blur.frag.spv              |  Bin 0 -> 4068 bytes
 gsk/resources/vulkan/blur.vert                  |   41 +++++++
 gsk/resources/vulkan/blur.vert.glsl             |   30 +++++
 gsk/resources/vulkan/blur.vert.spv              |  Bin 0 -> 3440 bytes
 gsk/resources/vulkan/meson.build                |    2 +
 17 files changed, 383 insertions(+), 0 deletions(-)
---
diff --git a/gsk/gskvulkanblurpipeline.c b/gsk/gskvulkanblurpipeline.c
new file mode 100644
index 0000000..779bf81
--- /dev/null
+++ b/gsk/gskvulkanblurpipeline.c
@@ -0,0 +1,129 @@
+#include "config.h"
+
+#include "gskvulkanblurpipelineprivate.h"
+
+struct _GskVulkanBlurPipeline
+{
+  GObject parent_instance;
+};
+
+typedef struct _GskVulkanBlurInstance GskVulkanBlurInstance;
+
+struct _GskVulkanBlurInstance
+{
+  float rect[4];
+  float tex_rect[4];
+  float blur_radius;
+};
+
+G_DEFINE_TYPE (GskVulkanBlurPipeline, gsk_vulkan_blur_pipeline, GSK_TYPE_VULKAN_PIPELINE)
+
+static const VkPipelineVertexInputStateCreateInfo *
+gsk_vulkan_blur_pipeline_get_input_state_create_info (GskVulkanPipeline *self)
+{
+  static const VkVertexInputBindingDescription vertexBindingDescriptions[] = {
+      {
+          .binding = 0,
+          .stride = sizeof (GskVulkanBlurInstance),
+          .inputRate = VK_VERTEX_INPUT_RATE_INSTANCE
+      }
+  };
+  static const VkVertexInputAttributeDescription vertexInputAttributeDescription[] = {
+      {
+          .location = 0,
+          .binding = 0,
+          .format = VK_FORMAT_R32G32B32A32_SFLOAT,
+          .offset = 0,
+      },
+      {
+          .location = 1,
+          .binding = 0,
+          .format = VK_FORMAT_R32G32B32A32_SFLOAT,
+          .offset = G_STRUCT_OFFSET (GskVulkanBlurInstance, tex_rect),
+      },
+      {
+          .location = 2,
+          .binding = 0,
+          .format = VK_FORMAT_R32_SFLOAT,
+          .offset = G_STRUCT_OFFSET (GskVulkanBlurInstance, blur_radius),
+      }
+  };
+  static const VkPipelineVertexInputStateCreateInfo info = {
+      .sType = VK_STRUCTURE_TYPE_PIPELINE_VERTEX_INPUT_STATE_CREATE_INFO,
+      .vertexBindingDescriptionCount = G_N_ELEMENTS (vertexBindingDescriptions),
+      .pVertexBindingDescriptions = vertexBindingDescriptions,
+      .vertexAttributeDescriptionCount = G_N_ELEMENTS (vertexInputAttributeDescription),
+      .pVertexAttributeDescriptions = vertexInputAttributeDescription
+  };
+
+  return &info;
+}
+
+static void
+gsk_vulkan_blur_pipeline_finalize (GObject *gobject)
+{
+  //GskVulkanBlurPipeline *self = GSK_VULKAN_BLUR_PIPELINE (gobject);
+
+  G_OBJECT_CLASS (gsk_vulkan_blur_pipeline_parent_class)->finalize (gobject);
+}
+
+static void
+gsk_vulkan_blur_pipeline_class_init (GskVulkanBlurPipelineClass *klass)
+{
+  GskVulkanPipelineClass *pipeline_class = GSK_VULKAN_PIPELINE_CLASS (klass);
+
+  G_OBJECT_CLASS (klass)->finalize = gsk_vulkan_blur_pipeline_finalize;
+
+  pipeline_class->get_input_state_create_info = gsk_vulkan_blur_pipeline_get_input_state_create_info;
+}
+
+static void
+gsk_vulkan_blur_pipeline_init (GskVulkanBlurPipeline *self)
+{
+}
+
+GskVulkanPipeline *
+gsk_vulkan_blur_pipeline_new (GskVulkanPipelineLayout *layout,
+                              const char              *shader_name,
+                              VkRenderPass             render_pass)
+{
+  return gsk_vulkan_pipeline_new (GSK_TYPE_VULKAN_BLUR_PIPELINE, layout, shader_name, render_pass);
+}
+
+gsize
+gsk_vulkan_blur_pipeline_count_vertex_data (GskVulkanBlurPipeline *pipeline)
+{
+  return sizeof (GskVulkanBlurInstance);
+}
+
+void
+gsk_vulkan_blur_pipeline_collect_vertex_data (GskVulkanBlurPipeline *pipeline,
+                                              guchar                *data,
+                                              const graphene_rect_t *rect,
+                                              double                 blur_radius)
+{
+  GskVulkanBlurInstance *instance = (GskVulkanBlurInstance *) data;
+
+  instance->rect[0] = rect->origin.x;
+  instance->rect[1] = rect->origin.y;
+  instance->rect[2] = rect->size.width;
+  instance->rect[3] = rect->size.height;
+  instance->tex_rect[0] = 0.0;
+  instance->tex_rect[1] = 0.0;
+  instance->tex_rect[2] = 1.0;
+  instance->tex_rect[3] = 1.0;
+  instance->blur_radius = blur_radius;
+}
+
+gsize
+gsk_vulkan_blur_pipeline_draw (GskVulkanBlurPipeline *pipeline,
+                               VkCommandBuffer        command_buffer,
+                               gsize                  offset,
+                               gsize                  n_commands)
+{
+  vkCmdDraw (command_buffer,
+             6, n_commands,
+             0, offset);
+
+  return n_commands;
+}
diff --git a/gsk/gskvulkanblurpipelineprivate.h b/gsk/gskvulkanblurpipelineprivate.h
new file mode 100644
index 0000000..44b139d
--- /dev/null
+++ b/gsk/gskvulkanblurpipelineprivate.h
@@ -0,0 +1,32 @@
+#ifndef __GSK_VULKAN_BLUR_PIPELINE_PRIVATE_H__
+#define __GSK_VULKAN_BLUR_PIPELINE_PRIVATE_H__
+
+#include <graphene.h>
+
+#include "gskvulkanpipelineprivate.h"
+
+G_BEGIN_DECLS
+
+typedef struct _GskVulkanBlurPipelineLayout GskVulkanBlurPipelineLayout;
+
+#define GSK_TYPE_VULKAN_BLUR_PIPELINE (gsk_vulkan_blur_pipeline_get_type ())
+
+G_DECLARE_FINAL_TYPE (GskVulkanBlurPipeline, gsk_vulkan_blur_pipeline, GSK, VULKAN_BLUR_PIPELINE, 
GskVulkanPipeline)
+
+GskVulkanPipeline *     gsk_vulkan_blur_pipeline_new                   (GskVulkanPipelineLayout *layout,
+                                                                        const char              *shader_name,
+                                                                        VkRenderPass             
render_pass);
+
+gsize                   gsk_vulkan_blur_pipeline_count_vertex_data     (GskVulkanBlurPipeline   *pipeline);
+void                    gsk_vulkan_blur_pipeline_collect_vertex_data   (GskVulkanBlurPipeline   *pipeline,
+                                                                        guchar                  *data,
+                                                                        const graphene_rect_t   *rect,
+                                                                        double                   radius);
+gsize                   gsk_vulkan_blur_pipeline_draw                  (GskVulkanBlurPipeline   *pipeline,
+                                                                        VkCommandBuffer          
command_buffer,
+                                                                        gsize                    offset,
+                                                                        gsize                    n_commands);
+
+G_END_DECLS
+
+#endif /* __GSK_VULKAN_BLUR_PIPELINE_PRIVATE_H__ */
diff --git a/gsk/gskvulkanrender.c b/gsk/gskvulkanrender.c
index cf98e18..4da8e48 100644
--- a/gsk/gskvulkanrender.c
+++ b/gsk/gskvulkanrender.c
@@ -11,6 +11,7 @@
 #include "gskvulkanrenderpassprivate.h"
 
 #include "gskvulkanblendpipelineprivate.h"
+#include "gskvulkanblurpipelineprivate.h"
 #include "gskvulkanborderpipelineprivate.h"
 #include "gskvulkanboxshadowpipelineprivate.h"
 #include "gskvulkancolorpipelineprivate.h"
@@ -340,6 +341,9 @@ gsk_vulkan_render_get_pipeline (GskVulkanRender       *self,
     { "outset-shadow", gsk_vulkan_box_shadow_pipeline_new },
     { "outset-shadow-clip", gsk_vulkan_box_shadow_pipeline_new },
     { "outset-shadow-clip-rounded", gsk_vulkan_box_shadow_pipeline_new },
+    { "blur", gsk_vulkan_blur_pipeline_new },
+    { "blur-clip", gsk_vulkan_blur_pipeline_new },
+    { "blur-clip-rounded", gsk_vulkan_blur_pipeline_new },
   };
 
   g_return_val_if_fail (type < GSK_VULKAN_N_PIPELINES, NULL);
diff --git a/gsk/gskvulkanrenderpass.c b/gsk/gskvulkanrenderpass.c
index b5bab5f..f3b2b0c 100644
--- a/gsk/gskvulkanrenderpass.c
+++ b/gsk/gskvulkanrenderpass.c
@@ -7,6 +7,7 @@
 #include "gskrenderer.h"
 #include "gskroundedrectprivate.h"
 #include "gskvulkanblendpipelineprivate.h"
+#include "gskvulkanblurpipelineprivate.h"
 #include "gskvulkanborderpipelineprivate.h"
 #include "gskvulkanboxshadowpipelineprivate.h"
 #include "gskvulkanclipprivate.h"
@@ -31,6 +32,7 @@ typedef enum {
   GSK_VULKAN_OP_COLOR,
   GSK_VULKAN_OP_LINEAR_GRADIENT,
   GSK_VULKAN_OP_OPACITY,
+  GSK_VULKAN_OP_BLUR,
   GSK_VULKAN_OP_COLOR_MATRIX,
   GSK_VULKAN_OP_BORDER,
   GSK_VULKAN_OP_INSET_SHADOW,
@@ -231,6 +233,20 @@ gsk_vulkan_render_pass_add_node (GskVulkanRenderPass           *self,
       g_array_append_val (self->render_ops, op);
       return;
 
+    case GSK_BLUR_NODE:
+      if (gsk_vulkan_clip_contains_rect (&constants->clip, &node->bounds))
+        pipeline_type = GSK_VULKAN_PIPELINE_BLUR;
+      else if (constants->clip.type == GSK_VULKAN_CLIP_RECT)
+        pipeline_type = GSK_VULKAN_PIPELINE_BLUR_CLIP;
+      else if (constants->clip.type == GSK_VULKAN_CLIP_ROUNDED_CIRCULAR)
+        pipeline_type = GSK_VULKAN_PIPELINE_BLUR_CLIP_ROUNDED;
+      else
+        FALLBACK ("Blur nodes can't deal with clip type %u\n", constants->clip.type);
+      op.type = GSK_VULKAN_OP_BLUR;
+      op.render.pipeline = gsk_vulkan_render_get_pipeline (render, pipeline_type);
+      g_array_append_val (self->render_ops, op);
+      return;
+
     case GSK_COLOR_MATRIX_NODE:
       if (gsk_vulkan_clip_contains_rect (&constants->clip, &node->bounds))
         pipeline_type = GSK_VULKAN_PIPELINE_COLOR_MATRIX;
@@ -543,6 +559,18 @@ gsk_vulkan_render_pass_upload (GskVulkanRenderPass  *self,
           }
           break;
 
+        case GSK_VULKAN_OP_BLUR:
+          {
+            GskRenderNode *child = gsk_blur_node_get_child (op->render.node);
+
+            op->render.source = gsk_vulkan_render_pass_get_node_as_texture (self,
+                                                                            render,
+                                                                            uploader,
+                                                                            child,
+                                                                            &child->bounds);
+          }
+          break;
+
         case GSK_VULKAN_OP_COLOR_MATRIX:
           {
             GskRenderNode *child = gsk_color_matrix_node_get_child (op->render.node);
@@ -607,6 +635,11 @@ gsk_vulkan_render_pass_count_vertex_data (GskVulkanRenderPass *self)
           n_bytes += op->render.vertex_count;
           break;
 
+        case GSK_VULKAN_OP_BLUR:
+          op->render.vertex_count = gsk_vulkan_blur_pipeline_count_vertex_data (GSK_VULKAN_BLUR_PIPELINE 
(op->render.pipeline));
+          n_bytes += op->render.vertex_count;
+          break;
+
         case GSK_VULKAN_OP_BORDER:
           op->render.vertex_count = gsk_vulkan_border_pipeline_count_vertex_data (GSK_VULKAN_BORDER_PIPELINE 
(op->render.pipeline));
           n_bytes += op->render.vertex_count;
@@ -707,6 +740,17 @@ gsk_vulkan_render_pass_collect_vertex_data (GskVulkanRenderPass *self,
           }
           break;
 
+        case GSK_VULKAN_OP_BLUR:
+          {
+            op->render.vertex_offset = offset + n_bytes;
+            gsk_vulkan_blur_pipeline_collect_vertex_data (GSK_VULKAN_BLUR_PIPELINE (op->render.pipeline),
+                                                          data + n_bytes + offset,
+                                                          &op->render.node->bounds,
+                                                          gsk_blur_node_get_radius (op->render.node));
+            n_bytes += op->render.vertex_count;
+          }
+          break;
+
         case GSK_VULKAN_OP_COLOR_MATRIX:
           {
             op->render.vertex_offset = offset + n_bytes;
@@ -792,6 +836,7 @@ gsk_vulkan_render_pass_reserve_descriptor_sets (GskVulkanRenderPass *self,
         case GSK_VULKAN_OP_SURFACE:
         case GSK_VULKAN_OP_TEXTURE:
         case GSK_VULKAN_OP_OPACITY:
+        case GSK_VULKAN_OP_BLUR:
         case GSK_VULKAN_OP_COLOR_MATRIX:
           op->render.descriptor_set_index = gsk_vulkan_render_reserve_descriptor_set (render, 
op->render.source);
           break;
@@ -899,6 +944,39 @@ gsk_vulkan_render_pass_draw (GskVulkanRenderPass     *self,
                                                                  current_draw_index, 1);
           break;
 
+        case GSK_VULKAN_OP_BLUR:
+          if (current_pipeline != op->render.pipeline)
+            {
+              current_pipeline = op->render.pipeline;
+              vkCmdBindPipeline (command_buffer,
+                                 VK_PIPELINE_BIND_POINT_GRAPHICS,
+                                 gsk_vulkan_pipeline_get_pipeline (current_pipeline));
+              vkCmdBindVertexBuffers (command_buffer,
+                                      0,
+                                      1,
+                                      (VkBuffer[1]) {
+                                          gsk_vulkan_buffer_get_buffer (vertex_buffer)
+                                      },
+                                      (VkDeviceSize[1]) { op->render.vertex_offset });
+              current_draw_index = 0;
+            }
+
+          vkCmdBindDescriptorSets (command_buffer,
+                                   VK_PIPELINE_BIND_POINT_GRAPHICS,
+                                   gsk_vulkan_pipeline_layout_get_pipeline_layout (layout),
+                                   0,
+                                   1,
+                                   (VkDescriptorSet[1]) {
+                                       gsk_vulkan_render_get_descriptor_set (render, 
op->render.descriptor_set_index)
+                                   },
+                                   0,
+                                   NULL);
+
+          current_draw_index += gsk_vulkan_blur_pipeline_draw (GSK_VULKAN_BLUR_PIPELINE (current_pipeline),
+                                                               command_buffer,
+                                                               current_draw_index, 1);
+          break;
+
         case GSK_VULKAN_OP_COLOR:
           if (current_pipeline != op->render.pipeline)
             {
diff --git a/gsk/gskvulkanrenderprivate.h b/gsk/gskvulkanrenderprivate.h
index 29860f0..4c01e82 100644
--- a/gsk/gskvulkanrenderprivate.h
+++ b/gsk/gskvulkanrenderprivate.h
@@ -31,6 +31,9 @@ typedef enum {
   GSK_VULKAN_PIPELINE_OUTSET_SHADOW,
   GSK_VULKAN_PIPELINE_OUTSET_SHADOW_CLIP,
   GSK_VULKAN_PIPELINE_OUTSET_SHADOW_CLIP_ROUNDED,
+  GSK_VULKAN_PIPELINE_BLUR,
+  GSK_VULKAN_PIPELINE_BLUR_CLIP,
+  GSK_VULKAN_PIPELINE_BLUR_CLIP_ROUNDED,
   /* add more */
   GSK_VULKAN_N_PIPELINES
 } GskVulkanPipelineType;
diff --git a/gsk/meson.build b/gsk/meson.build
index 83be577..7725171 100644
--- a/gsk/meson.build
+++ b/gsk/meson.build
@@ -50,6 +50,7 @@ gsk_private_vulkan_compiled_shaders = []
 if have_vulkan
   gsk_private_sources += files([
     'gskvulkanblendpipeline.c',
+    'gskvulkanblurpipeline.c',
     'gskvulkanborderpipeline.c',
     'gskvulkanboxshadowpipeline.c',
     'gskvulkanbuffer.c',
diff --git a/gsk/resources/vulkan/blur-clip-rounded.frag.spv b/gsk/resources/vulkan/blur-clip-rounded.frag.spv
new file mode 100644
index 0000000..bdec4c9
Binary files /dev/null and b/gsk/resources/vulkan/blur-clip-rounded.frag.spv differ
diff --git a/gsk/resources/vulkan/blur-clip-rounded.vert.spv b/gsk/resources/vulkan/blur-clip-rounded.vert.spv
new file mode 100644
index 0000000..2e3c5ff
Binary files /dev/null and b/gsk/resources/vulkan/blur-clip-rounded.vert.spv differ
diff --git a/gsk/resources/vulkan/blur-clip.frag.spv b/gsk/resources/vulkan/blur-clip.frag.spv
new file mode 100644
index 0000000..d6619c9
Binary files /dev/null and b/gsk/resources/vulkan/blur-clip.frag.spv differ
diff --git a/gsk/resources/vulkan/blur-clip.vert.spv b/gsk/resources/vulkan/blur-clip.vert.spv
new file mode 100644
index 0000000..2e3c5ff
Binary files /dev/null and b/gsk/resources/vulkan/blur-clip.vert.spv differ
diff --git a/gsk/resources/vulkan/blur.frag b/gsk/resources/vulkan/blur.frag
new file mode 100644
index 0000000..2dd584b
--- /dev/null
+++ b/gsk/resources/vulkan/blur.frag
@@ -0,0 +1,50 @@
+#version 420 core
+
+#include "clip.frag.glsl"
+
+layout(location = 0) in vec2 inPos;
+layout(location = 1) in flat vec2 inSize;
+layout(location = 2) in vec2 inTexCoord;
+layout(location = 3) in float inRadius;
+
+layout(set = 0, binding = 0) uniform sampler2D inTexture;
+
+layout(location = 0) out vec4 color;
+
+const int   samples_x    = 15;  // must be odd
+const int   samples_y    = 15;  // must be odd
+
+const int   half_samples_x = samples_x / 2;
+const int   half_samples_y = samples_y / 2;
+
+float Gaussian (float sigma, float x)
+{
+  return exp ( - (x * x) / (2.0 * sigma * sigma));
+}
+
+vec4 blur_pixel (in vec2 uv)
+{
+  float total = 0.0;
+  vec4 ret = vec4 (0);
+  float pixel_size_x = (1.0 / inSize.x);
+  float pixel_size_y = (1.0 / inSize.y);
+
+  for (int y = 0; y < samples_y; ++y)
+    {
+      float fy = Gaussian (inRadius, float(y) - float(half_samples_x));
+      float offset_y = float(y - half_samples_y) * pixel_size_y;
+      for (int x = 0; x < samples_x; ++x)
+        {
+          float fx = Gaussian (inRadius, float(x) - float(half_samples_x));
+          float offset_x = float(x - half_samples_x) * pixel_size_x;
+          total += fx * fy;
+          ret += texture(inTexture, uv + vec2(offset_x, offset_y)) * fx * fy;
+        }
+    }
+  return ret / total;
+}
+
+void main()
+{
+  color = clip (inPos, blur_pixel (inTexCoord));
+}
diff --git a/gsk/resources/vulkan/blur.frag.glsl b/gsk/resources/vulkan/blur.frag.glsl
new file mode 100644
index 0000000..528db20
--- /dev/null
+++ b/gsk/resources/vulkan/blur.frag.glsl
@@ -0,0 +1,13 @@
+#version 420 core
+
+#include "clip.frag.glsl"
+
+layout(location = 0) in vec2 inPos;
+layout(location = 1) in float inRadius;
+
+layout(location = 0) out vec4 color;
+
+void main()
+{
+  color = clip (inPos, vec4(1, 0, 0, 0));
+}
diff --git a/gsk/resources/vulkan/blur.frag.spv b/gsk/resources/vulkan/blur.frag.spv
new file mode 100644
index 0000000..d6619c9
Binary files /dev/null and b/gsk/resources/vulkan/blur.frag.spv differ
diff --git a/gsk/resources/vulkan/blur.vert b/gsk/resources/vulkan/blur.vert
new file mode 100644
index 0000000..4a5a138
--- /dev/null
+++ b/gsk/resources/vulkan/blur.vert
@@ -0,0 +1,41 @@
+
+#version 420 core
+
+#include "clip.vert.glsl"
+
+layout(location = 0) in vec4 inRect;
+layout(location = 1) in vec4 inTexRect;
+layout(location = 2) in float inRadius;
+
+layout(location = 0) out vec2 outPos;
+layout(location = 1) out flat vec2 outSize;
+layout(location = 2) out vec2 outTexCoord;
+layout(location = 3) out flat float outRadius;
+
+out gl_PerVertex {
+  vec4 gl_Position;
+};
+
+vec2 offsets[6] = { vec2(0.0, 0.0),
+                    vec2(1.0, 0.0),
+                    vec2(0.0, 1.0),
+                    vec2(0.0, 1.0),
+                    vec2(1.0, 0.0),
+                    vec2(1.0, 1.0) };
+
+void main() {
+  vec4 rect = clip (inRect);
+  vec2 pos = rect.xy + rect.zw * offsets[gl_VertexIndex];
+  gl_Position = push.mvp * vec4 (pos, 0.0, 1.0);
+
+  outPos = pos;
+  outSize = inRect.zw;
+
+  vec4 texrect = vec4((rect.xy - inRect.xy) / inRect.zw,
+                      rect.zw / inRect.zw);
+  texrect = vec4(inTexRect.xy + inTexRect.zw * texrect.xy,
+                 inTexRect.zw * texrect.zw);
+  outTexCoord = texrect.xy + texrect.zw * offsets[gl_VertexIndex];
+
+  outRadius = inRadius;
+}
diff --git a/gsk/resources/vulkan/blur.vert.glsl b/gsk/resources/vulkan/blur.vert.glsl
new file mode 100644
index 0000000..f50ca37
--- /dev/null
+++ b/gsk/resources/vulkan/blur.vert.glsl
@@ -0,0 +1,30 @@
+#version 420 core
+
+#include "clip.vert.glsl"
+
+layout(location = 0) in vec4 inRect;
+layout(location = 1) in float inRadius;
+
+layout(location = 0) out vec2 outPos;
+layout(location = 1) out flat float outRadius;
+
+out gl_PerVertex {
+  vec4 gl_Position;
+};
+
+vec2 offsets[6] = { vec2(0.0, 0.0),
+                    vec2(1.0, 0.0),
+                    vec2(0.0, 1.0),
+                    vec2(0.0, 1.0),
+                    vec2(1.0, 0.0),
+                    vec2(1.0, 1.0) };
+
+void main() {
+  vec4 rect = clip (inRect);
+
+  vec2 pos = rect.xy + rect.zw * offsets[gl_VertexIndex];
+  gl_Position = push.mvp * vec4 (pos, 0.0, 1.0);
+  outPos = pos;
+  outRadius = inRadius;
+}
+
diff --git a/gsk/resources/vulkan/blur.vert.spv b/gsk/resources/vulkan/blur.vert.spv
new file mode 100644
index 0000000..f83b77a
Binary files /dev/null and b/gsk/resources/vulkan/blur.vert.spv differ
diff --git a/gsk/resources/vulkan/meson.build b/gsk/resources/vulkan/meson.build
index 8595ccf..bdca123 100644
--- a/gsk/resources/vulkan/meson.build
+++ b/gsk/resources/vulkan/meson.build
@@ -8,6 +8,7 @@
 
 gsk_private_vulkan_fragment_shaders = [
   'blend.frag',
+  'blur.frag',
   'border.frag',
   'color.frag',
   'color-matrix.frag',
@@ -18,6 +19,7 @@ gsk_private_vulkan_fragment_shaders = [
 
 gsk_private_vulkan_vertex_shaders = [
   'blend.vert',
+  'blur.vert',
   'border.vert',
   'color.vert',
   'color-matrix.vert',
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