[gtk+] vulkan: We use VK_FORMAT_B8G8R8A8_UNORM

[Benjamin Otte <otte src gnome org>]

commit b30225e67c4a451b3480fd21a2b586473e82690c
Author: Benjamin Otte <otte redhat com>
Date:   Sun Dec 25 05:57:16 2016 +0100

    vulkan: We use VK_FORMAT_B8G8R8A8_UNORM
    
    ... not SRGB. SRGB messes up alpha compositing, GdkRGBA and everything
    else.

 gdk/gdkvulkancontext.c               |    2 +-
 gsk/gskvulkancolorpipeline.c         |    6 +++---
 gsk/gskvulkanimage.c                 |   12 ++++++------
 gsk/resources/vulkan/color.frag.glsl |    2 +-
 4 files changed, 11 insertions(+), 11 deletions(-)
---
diff --git a/gdk/gdkvulkancontext.c b/gdk/gdkvulkancontext.c
index 0fe921d..52f6b41 100644
--- a/gdk/gdkvulkancontext.c
+++ b/gdk/gdkvulkancontext.c
@@ -404,7 +404,7 @@ gdk_vulkan_context_real_init (GInitable     *initable,
                                                           &n_formats, formats);
       for (i = 0; i < n_formats; i++)
         {
-          if (formats[i].format == VK_FORMAT_B8G8R8A8_SRGB)
+          if (formats[i].format == VK_FORMAT_B8G8R8A8_UNORM)
             break;
         }
       if (i == n_formats)
diff --git a/gsk/gskvulkancolorpipeline.c b/gsk/gskvulkancolorpipeline.c
index ab6c3e5..29e44ce 100644
--- a/gsk/gskvulkancolorpipeline.c
+++ b/gsk/gskvulkancolorpipeline.c
@@ -101,9 +101,9 @@ gsk_vulkan_color_pipeline_collect_vertex_data (GskVulkanColorPipeline *pipeline,
   instance->rect[1] = rect->origin.y;
   instance->rect[2] = rect->size.width;
   instance->rect[3] = rect->size.height;
-  instance->color[0] = pow (color->red, 2.2);
-  instance->color[1] = pow (color->green, 2.2);
-  instance->color[2] = pow (color->blue, 2.2);
+  instance->color[0] = color->red;
+  instance->color[1] = color->green;
+  instance->color[2] = color->blue;
   instance->color[3] = color->alpha;
 }
 
diff --git a/gsk/gskvulkanimage.c b/gsk/gskvulkanimage.c
index 9ef2c51..4dea8e6 100644
--- a/gsk/gskvulkanimage.c
+++ b/gsk/gskvulkanimage.c
@@ -167,7 +167,7 @@ gsk_vulkan_image_new (GdkVulkanContext      *context,
                                     .sType = VK_STRUCTURE_TYPE_IMAGE_CREATE_INFO,
                                     .flags = 0,
                                     .imageType = VK_IMAGE_TYPE_2D,
-                                    .format = VK_FORMAT_B8G8R8A8_SRGB,
+                                    .format = VK_FORMAT_B8G8R8A8_UNORM,
                                     .extent = { width, height, 1 },
                                     .mipLevels = 1,
                                     .arrayLayers = 1,
@@ -359,7 +359,7 @@ gsk_vulkan_image_new_from_data_via_staging_buffer (GskVulkanUploader *uploader,
 
   uploader->staging_buffer_free_list = g_slist_prepend (uploader->staging_buffer_free_list, staging);
 
-  gsk_vulkan_image_ensure_view (self, VK_FORMAT_B8G8R8A8_SRGB);
+  gsk_vulkan_image_ensure_view (self, VK_FORMAT_B8G8R8A8_UNORM);
 
   return self;
 }
@@ -478,7 +478,7 @@ gsk_vulkan_image_new_from_data_via_staging_image (GskVulkanUploader *uploader,
 
   uploader->staging_image_free_list = g_slist_prepend (uploader->staging_image_free_list, staging);
 
-  gsk_vulkan_image_ensure_view (self, VK_FORMAT_B8G8R8A8_SRGB);
+  gsk_vulkan_image_ensure_view (self, VK_FORMAT_B8G8R8A8_UNORM);
 
   return self;
 }
@@ -521,7 +521,7 @@ gsk_vulkan_image_new_from_data_directly (GskVulkanUploader *uploader,
                                              }
                                          });
 
-  gsk_vulkan_image_ensure_view (self, VK_FORMAT_B8G8R8A8_SRGB);
+  gsk_vulkan_image_ensure_view (self, VK_FORMAT_B8G8R8A8_UNORM);
 
   return self;
 }
@@ -557,7 +557,7 @@ gsk_vulkan_image_new_for_swapchain (GdkVulkanContext *context,
   self->height = height;
   self->vk_image = image;
 
-  gsk_vulkan_image_ensure_view (self, VK_FORMAT_B8G8R8A8_SRGB);
+  gsk_vulkan_image_ensure_view (self, VK_FORMAT_B8G8R8A8_UNORM);
 
   return self;
 }
@@ -577,7 +577,7 @@ gsk_vulkan_image_new_for_framebuffer (GdkVulkanContext *context,
                                VK_IMAGE_USAGE_TRANSFER_SRC_BIT | VK_IMAGE_USAGE_COLOR_ATTACHMENT_BIT,
                                VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT);
 
-  gsk_vulkan_image_ensure_view (self, VK_FORMAT_B8G8R8A8_SRGB);
+  gsk_vulkan_image_ensure_view (self, VK_FORMAT_B8G8R8A8_UNORM);
 
   return self;
 }
diff --git a/gsk/resources/vulkan/color.frag.glsl b/gsk/resources/vulkan/color.frag.glsl
index 68d77d7..218ee85 100644
--- a/gsk/resources/vulkan/color.frag.glsl
+++ b/gsk/resources/vulkan/color.frag.glsl
@@ -6,5 +6,5 @@ layout(location = 0) out vec4 color;
 
 void main()
 {
-    color = inColor;
+    color = vec4(inColor.rgb * inColor.a, inColor.a);
 }