[gtk+] vulkan: Allow to control scaling in the blend pipeline

[Matthias Clasen <matthiasc src gnome org>]

commit 538e7c79821c754196e89de33162e0bd9a2cb62f
Author: Matthias Clasen <mclasen redhat com>
Date:   Fri Sep 29 22:07:30 2017 -0400

    vulkan: Allow to control scaling in the blend pipeline
    
    Pass in a second rect that defines the size of the texture.
    Update the sole caller to pass in the same rect, for unchanged
    behavior.

 gsk/gskvulkanblendpipeline.c        |   11 ++++++-----
 gsk/gskvulkanblendpipelineprivate.h |    3 ++-
 gsk/gskvulkanrenderpass.c           |    1 +
 3 files changed, 9 insertions(+), 6 deletions(-)
---
diff --git a/gsk/gskvulkanblendpipeline.c b/gsk/gskvulkanblendpipeline.c
index 6d939ca..2bcd549 100644
--- a/gsk/gskvulkanblendpipeline.c
+++ b/gsk/gskvulkanblendpipeline.c
@@ -93,7 +93,8 @@ gsk_vulkan_blend_pipeline_count_vertex_data (GskVulkanBlendPipeline *pipeline)
 void
 gsk_vulkan_blend_pipeline_collect_vertex_data (GskVulkanBlendPipeline *pipeline,
                                                guchar                 *data,
-                                               const graphene_rect_t  *rect)
+                                               const graphene_rect_t  *rect,
+                                               const graphene_rect_t  *tex_rect)
 {
   GskVulkanBlendInstance *instance = (GskVulkanBlendInstance *) data;
 
@@ -101,10 +102,10 @@ gsk_vulkan_blend_pipeline_collect_vertex_data (GskVulkanBlendPipeline *pipeline,
   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->tex_rect[0] = (rect->origin.x - tex_rect->origin.x)/tex_rect->size.width;
+  instance->tex_rect[1] = (rect->origin.y - tex_rect->origin.y)/tex_rect->size.height;
+  instance->tex_rect[2] = (rect->size.width + rect->origin.x - tex_rect->origin.x)/tex_rect->size.width;
+  instance->tex_rect[3] = (rect->size.height + rect->origin.y - tex_rect->origin.y)/tex_rect->size.height;
 }
 
 gsize
diff --git a/gsk/gskvulkanblendpipelineprivate.h b/gsk/gskvulkanblendpipelineprivate.h
index eb47198..678db00 100644
--- a/gsk/gskvulkanblendpipelineprivate.h
+++ b/gsk/gskvulkanblendpipelineprivate.h
@@ -21,7 +21,8 @@ GskVulkanPipeline *     gsk_vulkan_blend_pipeline_new                   (GdkVulk
 gsize                   gsk_vulkan_blend_pipeline_count_vertex_data     (GskVulkanBlendPipeline         
*pipeline);
 void                    gsk_vulkan_blend_pipeline_collect_vertex_data   (GskVulkanBlendPipeline         
*pipeline,
                                                                          guchar                         
*data,
-                                                                         const graphene_rect_t          
*rect);
+                                                                         const graphene_rect_t          
*rect,
+                                                                         const graphene_rect_t          
*tex_rect);
 gsize                   gsk_vulkan_blend_pipeline_draw                  (GskVulkanBlendPipeline         
*pipeline,
                                                                          VkCommandBuffer                 
command_buffer,
                                                                          gsize                           
offset,
diff --git a/gsk/gskvulkanrenderpass.c b/gsk/gskvulkanrenderpass.c
index b222b9c..77f4fcd 100644
--- a/gsk/gskvulkanrenderpass.c
+++ b/gsk/gskvulkanrenderpass.c
@@ -1055,6 +1055,7 @@ gsk_vulkan_render_pass_collect_vertex_data (GskVulkanRenderPass *self,
             op->render.vertex_offset = offset + n_bytes;
             gsk_vulkan_blend_pipeline_collect_vertex_data (GSK_VULKAN_BLEND_PIPELINE (op->render.pipeline),
                                                            data + n_bytes + offset,
+                                                           &op->render.node->bounds,
                                                            &op->render.node->bounds);
             n_bytes += op->render.vertex_count;
           }