gbm: Add gbm_bo_write entry point

This new gbm entry point allows writing data into a gbm bo.  The bo has
to be created with the GBM_BO_USE_WRITE flag, and it's only required to
work for GBM_BO_USE_CURSOR_64X64 bos.

The gbm API is designed to be the glue layer between EGL and KMS, but there
was never a mechanism initialize a buffer suitable for use with KMS
hw cursors.  The hw cursor bo is typically not compatible with anything EGL
can render to, and thus there's no way to get data into such a bo.

gbm_bo_write() fills that gap while staying out of the efficient
cpu->gpu pixel transfer business.

Reviewed-by: Ander Conselvan de Oliveira <[email protected]>

1 files changed, 9 insertions, 1 deletions

diff --git a/include/GL/internal/dri_interface.h b/include/GL/internal/dri_interface.h
index eafbe10f9b0..e37917eda99 100644
--- a/include/GL/internal/dri_interface.h
+++ b/include/GL/internal/dri_interface.h
@@ -894,7 +894,7 @@ struct __DRIdri2ExtensionRec {
  * extensions.
  */
 #define __DRI_IMAGE "DRI_IMAGE"
-#define __DRI_IMAGE_VERSION 3
+#define __DRI_IMAGE_VERSION 4
 
 /**
  * These formats correspond to the similarly named MESA_FORMAT_*
@@ -911,6 +911,7 @@ struct __DRIdri2ExtensionRec {
 #define __DRI_IMAGE_USE_SHARE		0x0001
 #define __DRI_IMAGE_USE_SCANOUT		0x0002
 #define __DRI_IMAGE_USE_CURSOR		0x0004
+#define __DRI_IMAGE_USE_WRITE		0x0008
 
 /**
  * queryImage attributes
@@ -955,6 +956,13 @@ struct __DRIimageExtensionRec {
     * \since 2
     */
    GLboolean (*validateUsage)(__DRIimage *image, unsigned int use);
+
+   /**
+    * Write data into image.
+    *
+    * \since 4
+    */
+   int (*write)(__DRIimage *image, const void *buf, size_t count);
 };