[Mesa-dev] [PATCH 4/8] intel: Implement __DRIimage::createSubImage and bump supported version to 5

[Kristian Høgsberg]

We use the new miptree offset to pick out the sub-image when we bind
the EGLImage to a texture.

Signed-off-by: Kristian Høgsberg <krh at bitplanet.net>
---
 src/mesa/drivers/dri/intel/intel_regions.h   |    1 +
 src/mesa/drivers/dri/intel/intel_screen.c    |   36 ++++++++++++++++++++++++--
 src/mesa/drivers/dri/intel/intel_tex_image.c |    2 +-
 3 files changed, 36 insertions(+), 3 deletions(-)

diff --git a/src/mesa/drivers/dri/intel/intel_regions.h b/src/mesa/drivers/dri/intel/intel_regions.h
index 18f8093..782d669 100644
--- a/src/mesa/drivers/dri/intel/intel_regions.h
+++ b/src/mesa/drivers/dri/intel/intel_regions.h
@@ -147,6 +147,7 @@ struct __DRIimageRec {
    uint32_t usage;
    uint32_t dri_format;
    GLuint format;
+   uint32_t offset;
    void *data;
 };
 
diff --git a/src/mesa/drivers/dri/intel/intel_screen.c b/src/mesa/drivers/dri/intel/intel_screen.c
index 6b6ddec..33b7dd3 100644
--- a/src/mesa/drivers/dri/intel/intel_screen.c
+++ b/src/mesa/drivers/dri/intel/intel_screen.c
@@ -185,6 +185,7 @@ intel_allocate_image(int dri_format, void *loaderPrivate)
 	return NULL;
 
     image->dri_format = dri_format;
+    image->offset = 0;
 
     switch (dri_format) {
     case __DRI_IMAGE_FORMAT_RGB565:
@@ -268,6 +269,7 @@ intel_create_image_from_renderbuffer(__DRIcontext *context,
 
    image->internal_format = rb->InternalFormat;
    image->format = rb->Format;
+   image->offset = 0;
    image->data = loaderPrivate;
    intel_region_reference(&image->region, irb->mt->region);
 
@@ -377,6 +379,7 @@ intel_dup_image(__DRIimage *orig_image, void *loaderPrivate)
    image->usage           = orig_image->usage;
    image->dri_format      = orig_image->dri_format;
    image->format          = orig_image->format;
+   image->offset          = orig_image->offset;
    image->data            = loaderPrivate;
    
    return image;
@@ -413,8 +416,36 @@ intel_image_write(__DRIimage *image, const void *buf, size_t count)
    return 0;
 }
 
+static __DRIimage *
+intel_create_sub_image(__DRIimage *parent,
+                       int width, int height, int dri_format,
+                       int offset, int pitch, void *loaderPrivate)
+{
+    __DRIimage *image;
+
+    image = intel_allocate_image(dri_format, loaderPrivate);
+
+    image->region = calloc(sizeof(*image->region), 1);
+    if (image->region == NULL) {
+       FREE(image);
+       return NULL;
+    }
+
+    image->region->cpp = _mesa_get_format_bytes(image->format);
+    image->region->width = width;
+    image->region->height = height;
+    image->region->pitch = pitch;
+    image->region->refcount = 1;
+    image->region->bo = parent->region->bo;
+    drm_intel_bo_reference(image->region->bo);
+    image->region->tiling = parent->region->tiling;
+    image->offset = offset;
+
+    return image;
+}
+
 static struct __DRIimageExtensionRec intelImageExtension = {
-    { __DRI_IMAGE, 4 },
+    { __DRI_IMAGE, 5 },
     intel_create_image_from_name,
     intel_create_image_from_renderbuffer,
     intel_destroy_image,
@@ -422,7 +453,8 @@ static struct __DRIimageExtensionRec intelImageExtension = {
     intel_query_image,
     intel_dup_image,
     intel_validate_usage,
-    intel_image_write
+    intel_image_write,
+    intel_create_sub_image
 };
 
 static const __DRIextension *intelScreenExtensions[] = {
diff --git a/src/mesa/drivers/dri/intel/intel_tex_image.c b/src/mesa/drivers/dri/intel/intel_tex_image.c
index 0caa2e2..70fe762 100644
--- a/src/mesa/drivers/dri/intel/intel_tex_image.c
+++ b/src/mesa/drivers/dri/intel/intel_tex_image.c
@@ -350,7 +350,7 @@ intel_image_target_texture_2d(struct gl_context *ctx, GLenum target,
 
    intel_set_texture_image_region(ctx, texImage, image->region,
 				  target, image->internal_format,
-                                  image->format, 0);
+                                  image->format, image->offset);
 }
 #endif
 
-- 
1.7.10.2