[Mesa-dev] [PATCH 1/6] dri2: Create image from texture

[Abdiel Janulgue]

Add create image from texture extension.

Signed-off-by: Abdiel Janulgue <abdiel.janulgue at linux.intel.com>
---
 include/GL/internal/dri_interface.h |   12 +++++
 src/egl/drivers/dri2/egl_dri2.c     |   83 +++++++++++++++++++++++++++++++++++
 2 files changed, 95 insertions(+)

diff --git a/include/GL/internal/dri_interface.h b/include/GL/internal/dri_interface.h
index 1e0f1d0..a711cbf 100644
--- a/include/GL/internal/dri_interface.h
+++ b/include/GL/internal/dri_interface.h
@@ -1061,6 +1061,18 @@ struct __DRIimageExtensionRec {
     */
     __DRIimage *(*fromPlanar)(__DRIimage *image, int plane,
                               void *loaderPrivate);
+
+    /**
+     * Create image from texture.
+     *
+     * \since 5
+     */
+   __DRIimage *(*createImageFromTexture)(__DRIcontext *context,
+                                         int target,
+                                         unsigned texture,
+                                         int level,
+                                         int depth,
+                                         void *loaderPrivate);
 };
 
 
diff --git a/src/egl/drivers/dri2/egl_dri2.c b/src/egl/drivers/dri2/egl_dri2.c
index 1f13d79..00562b8 100644
--- a/src/egl/drivers/dri2/egl_dri2.c
+++ b/src/egl/drivers/dri2/egl_dri2.c
@@ -490,6 +490,12 @@ dri2_setup_screen(_EGLDisplay *disp)
       disp->Extensions.MESA_drm_image = EGL_TRUE;
       disp->Extensions.KHR_image_base = EGL_TRUE;
       disp->Extensions.KHR_gl_renderbuffer_image = EGL_TRUE;
+      if (dri2_dpy->image->base.version >= 5 &&
+          dri2_dpy->image->createImageFromTexture) {
+         disp->Extensions.KHR_gl_texture_2D_image = EGL_TRUE;
+         disp->Extensions.KHR_gl_texture_cubemap_image = EGL_TRUE;
+         disp->Extensions.KHR_gl_texture_3D_image = EGL_TRUE;
+      }
    }
 }
 
@@ -1210,6 +1216,75 @@ dri2_create_image_wayland_wl_buffer(_EGLDisplay *disp, _EGLContext *ctx,
 }
 #endif
 
+static _EGLImage *
+dri2_create_image_khr_texture(_EGLDisplay *disp, _EGLContext *ctx,
+				   EGLenum target,
+				   EGLClientBuffer buffer,
+				   const EGLint *attr_list)
+{
+   struct dri2_egl_display *dri2_dpy = dri2_egl_display(disp);
+   struct dri2_egl_context *dri2_ctx = dri2_egl_context(ctx);
+   struct dri2_egl_image *dri2_img;
+   GLuint texture = (GLuint) (uintptr_t) buffer;
+   _EGLImageAttribs attrs;
+   GLuint depth;
+   GLenum gl_target;
+
+   if (texture == 0) {
+      _eglError(EGL_BAD_PARAMETER, "dri2_create_image_khr");
+      return EGL_NO_IMAGE_KHR;
+   }
+
+   if (_eglParseImageAttribList(&attrs, disp, attr_list) != EGL_SUCCESS)
+      return EGL_NO_IMAGE_KHR;
+
+   switch (target) {
+   case EGL_GL_TEXTURE_2D_KHR:
+      depth = 0;
+      gl_target = GL_TEXTURE_2D;
+      break;
+   case EGL_GL_TEXTURE_3D_KHR:
+      depth = attrs.GLTextureZOffset;
+      gl_target = GL_TEXTURE_3D;
+      break;
+   case EGL_GL_TEXTURE_CUBE_MAP_POSITIVE_X_KHR:
+   case EGL_GL_TEXTURE_CUBE_MAP_NEGATIVE_X_KHR:
+   case EGL_GL_TEXTURE_CUBE_MAP_POSITIVE_Y_KHR:
+   case EGL_GL_TEXTURE_CUBE_MAP_NEGATIVE_Y_KHR:
+   case EGL_GL_TEXTURE_CUBE_MAP_POSITIVE_Z_KHR:
+   case EGL_GL_TEXTURE_CUBE_MAP_NEGATIVE_Z_KHR:
+      depth = target - EGL_GL_TEXTURE_CUBE_MAP_POSITIVE_X_KHR; 
+      gl_target = GL_TEXTURE_CUBE_MAP;
+      break;
+   }
+
+   dri2_img = malloc(sizeof *dri2_img);
+   if (!dri2_img) {
+      _eglError(EGL_BAD_ALLOC, "dri2_create_image_khr");
+      return EGL_NO_IMAGE_KHR;
+   }
+
+   if (!_eglInitImage(&dri2_img->base, disp)) {
+      _eglError(EGL_BAD_ALLOC, "dri2_create_image_khr");
+      free(dri2_img);
+      return EGL_NO_IMAGE_KHR;
+   }
+
+   dri2_img->dri_image = 
+      dri2_dpy->image->createImageFromTexture(dri2_ctx->dri_context,
+                                                   gl_target,
+						   texture,
+                                                   depth,
+                                                   attrs.GLTextureLevel,
+						   dri2_img);
+
+   if (!dri2_img->dri_image) {
+      free(dri2_img);
+      return EGL_NO_IMAGE_KHR;
+   }
+   return &dri2_img->base;
+}
+
 _EGLImage *
 dri2_create_image_khr(_EGLDriver *drv, _EGLDisplay *disp,
 		      _EGLContext *ctx, EGLenum target,
@@ -1218,6 +1293,14 @@ dri2_create_image_khr(_EGLDriver *drv, _EGLDisplay *disp,
    (void) drv;
 
    switch (target) {
+   case EGL_GL_TEXTURE_2D_KHR:
+   case EGL_GL_TEXTURE_CUBE_MAP_POSITIVE_X_KHR:
+   case EGL_GL_TEXTURE_CUBE_MAP_NEGATIVE_X_KHR:
+   case EGL_GL_TEXTURE_CUBE_MAP_POSITIVE_Y_KHR:
+   case EGL_GL_TEXTURE_CUBE_MAP_NEGATIVE_Y_KHR:
+   case EGL_GL_TEXTURE_CUBE_MAP_POSITIVE_Z_KHR:
+   case EGL_GL_TEXTURE_CUBE_MAP_NEGATIVE_Z_KHR:
+      return dri2_create_image_khr_texture(disp, ctx, target, buffer, attr_list);
    case EGL_GL_RENDERBUFFER_KHR:
       return dri2_create_image_khr_renderbuffer(disp, ctx, buffer, attr_list);
    case EGL_DRM_BUFFER_MESA:
-- 
1.7.9.5