intel: Keep track of x,y offsets in miptrees and use them for blitting.

By just using offsets, we confused the hardware's tiling calculations,
resulting in failures in miptree validation and blit clears.

Fixes piglit fbo-clearmipmap.

Bug #23552. (automatic mipmap generation)

8 files changed, 118 insertions, 140 deletions

diff --git a/src/mesa/drivers/dri/i965/brw_tex_layout.c b/src/mesa/drivers/dri/i965/brw_tex_layout.c
index 5986cbffad..e59e52ed86 100644
--- a/src/mesa/drivers/dri/i965/brw_tex_layout.c
+++ b/src/mesa/drivers/dri/i965/brw_tex_layout.c
@@ -86,10 +86,10 @@ GLboolean brw_miptree_layout(struct intel_context *intel,
           mt->pitch = intel_miptree_pitch_align(intel, mt, tiling, mt->pitch);
 
           if (mt->compressed) {
-              qpitch = (y_pitch + ALIGN(minify(y_pitch), align_h) + 11 * align_h) / 4 * mt->pitch * mt->cpp;
+              qpitch = (y_pitch + ALIGN(minify(y_pitch), align_h) + 11 * align_h) / 4;
               mt->total_height = (y_pitch + ALIGN(minify(y_pitch), align_h) + 11 * align_h) / 4 * 6;
           } else {
-              qpitch = (y_pitch + ALIGN(minify(y_pitch), align_h) + 11 * align_h) * mt->pitch * mt->cpp;
+              qpitch = (y_pitch + ALIGN(minify(y_pitch), align_h) + 11 * align_h);
               mt->total_height = (y_pitch + ALIGN(minify(y_pitch), align_h) + 11 * align_h) * 6;
           }
 
@@ -102,7 +102,8 @@ GLboolean brw_miptree_layout(struct intel_context *intel,
                                            height, 1);
 
               for (q = 0; q < nr_images; q++)
-                  intel_miptree_set_image_offset_ex(mt, level, q, x, y, q * qpitch);
+                  intel_miptree_set_image_offset(mt, level, q,
+						 x, y + q * qpitch);
 
               if (mt->compressed)
                   img_height = MAX2(1, height/4);
diff --git a/src/mesa/drivers/dri/intel/intel_blit.c b/src/mesa/drivers/dri/intel/intel_blit.c
index 0c5be4c798..ec4a5b492a 100644
--- a/src/mesa/drivers/dri/intel/intel_blit.c
+++ b/src/mesa/drivers/dri/intel/intel_blit.c
@@ -441,6 +441,10 @@ intelClearWithBlit(GLcontext *ctx, GLbitfield mask)
                   intel_region_buffer(intel, irb->region,
                                       all ? INTEL_WRITE_FULL :
                                       INTEL_WRITE_PART);
+	       int x1 = b.x1 + irb->region->draw_x;
+	       int y1 = b.y1 + irb->region->draw_y;
+	       int x2 = b.x2 + irb->region->draw_x;
+	       int y2 = b.y2 + irb->region->draw_y;
 
                GLuint clearVal;
                GLint pitch, cpp;
@@ -449,11 +453,10 @@ intelClearWithBlit(GLcontext *ctx, GLbitfield mask)
                pitch = irb->region->pitch;
                cpp = irb->region->cpp;
 
-               DBG("%s dst:buf(%p)/%d+%d %d,%d sz:%dx%d\n",
+               DBG("%s dst:buf(%p)/%d %d,%d sz:%dx%d\n",
                    __FUNCTION__,
                    irb->region->buffer, (pitch * cpp),
-                   irb->region->draw_offset,
-                   b.x1, b.y1, b.x2 - b.x1, b.y2 - b.y1);
+                   x1, y1, x2 - x1, y2 - y1);
 
 	       BR13 = 0xf0 << 16;
 	       CMD = XY_COLOR_BLT_CMD;
@@ -526,17 +529,17 @@ intelClearWithBlit(GLcontext *ctx, GLbitfield mask)
                   buf, irb->Base.Name);
                 */
 
-               assert(b.x1 < b.x2);
-               assert(b.y1 < b.y2);
+               assert(x1 < x2);
+               assert(y1 < y2);
 
                BEGIN_BATCH(6, REFERENCES_CLIPRECTS);
                OUT_BATCH(CMD);
                OUT_BATCH(BR13);
-               OUT_BATCH((b.y1 << 16) | b.x1);
-               OUT_BATCH((b.y2 << 16) | b.x2);
+               OUT_BATCH((y1 << 16) | x1);
+               OUT_BATCH((y2 << 16) | x2);
                OUT_RELOC(write_buffer,
 			 I915_GEM_DOMAIN_RENDER, I915_GEM_DOMAIN_RENDER,
-                         irb->region->draw_offset);
+                         0);
                OUT_BATCH(clearVal);
                ADVANCE_BATCH();
                clearMask &= ~bufBit;    /* turn off bit, for faster loop exit */
diff --git a/src/mesa/drivers/dri/intel/intel_fbo.c b/src/mesa/drivers/dri/intel/intel_fbo.c
index 804c034840..cf007d5b62 100644
--- a/src/mesa/drivers/dri/intel/intel_fbo.c
+++ b/src/mesa/drivers/dri/intel/intel_fbo.c
@@ -571,7 +571,7 @@ intel_render_texture(GLcontext * ctx,
       = att->Texture->Image[att->CubeMapFace][att->TextureLevel];
    struct intel_renderbuffer *irb = intel_renderbuffer(att->Renderbuffer);
    struct intel_texture_image *intel_image;
-   GLuint imageOffset;
+   GLuint dst_x, dst_y;
 
    (void) fb;
 
@@ -618,18 +618,16 @@ intel_render_texture(GLcontext * ctx,
    }
 
    /* compute offset of the particular 2D image within the texture region */
-   imageOffset = intel_miptree_image_offset(intel_image->mt,
-                                            att->CubeMapFace,
-                                            att->TextureLevel);
-
-   if (att->Texture->Target == GL_TEXTURE_3D) {
-      const GLuint *offsets = intel_miptree_depth_offsets(intel_image->mt,
-                                                          att->TextureLevel);
-      imageOffset += offsets[att->Zoffset];
-   }
-
-   /* store that offset in the region */
-   intel_image->mt->region->draw_offset = imageOffset;
+   intel_miptree_get_image_offset(intel_image->mt,
+				  att->TextureLevel,
+				  att->CubeMapFace,
+				  att->Zoffset,
+				  &dst_x, &dst_y);
+
+   intel_image->mt->region->draw_offset = (dst_y * intel_image->mt->pitch +
+					   dst_x) * intel_image->mt->cpp;
+   intel_image->mt->region->draw_x = dst_x;
+   intel_image->mt->region->draw_y = dst_y;
 
    /* update drawing region, etc */
    intel_draw_buffer(ctx, fb);
diff --git a/src/mesa/drivers/dri/intel/intel_mipmap_tree.c b/src/mesa/drivers/dri/intel/intel_mipmap_tree.c
index 4f5101a312..0589d82db2 100644
--- a/src/mesa/drivers/dri/intel/intel_mipmap_tree.c
+++ b/src/mesa/drivers/dri/intel/intel_mipmap_tree.c
@@ -287,9 +287,10 @@ intel_miptree_release(struct intel_context *intel,
 
       intel_region_release(&((*mt)->region));
 
-      for (i = 0; i < MAX_TEXTURE_LEVELS; i++)
-         if ((*mt)->level[i].image_offset)
-            free((*mt)->level[i].image_offset);
+      for (i = 0; i < MAX_TEXTURE_LEVELS; i++) {
+	 free((*mt)->level[i].x_offset);
+	 free((*mt)->level[i].y_offset);
+      }
 
       free(*mt);
    }
@@ -350,82 +351,58 @@ intel_miptree_set_level_info(struct intel_mipmap_tree *mt,
    mt->level[level].height = h;
    mt->level[level].depth = d;
    mt->level[level].level_offset = (x + y * mt->pitch) * mt->cpp;
+   mt->level[level].level_x = x;
+   mt->level[level].level_y = y;
    mt->level[level].nr_images = nr_images;
 
    DBG("%s level %d size: %d,%d,%d offset %d,%d (0x%x)\n", __FUNCTION__,
        level, w, h, d, x, y, mt->level[level].level_offset);
 
-   /* Not sure when this would happen, but anyway: 
-    */
-   if (mt->level[level].image_offset) {
-      free(mt->level[level].image_offset);
-      mt->level[level].image_offset = NULL;
-   }
-
    assert(nr_images);
+   assert(!mt->level[level].x_offset);
 
-   mt->level[level].image_offset = malloc(nr_images * sizeof(GLuint));
-   mt->level[level].image_offset[0] = 0;
+   mt->level[level].x_offset = malloc(nr_images * sizeof(GLuint));
+   mt->level[level].x_offset[0] = mt->level[level].level_x;
+   mt->level[level].y_offset = malloc(nr_images * sizeof(GLuint));
+   mt->level[level].y_offset[0] = mt->level[level].level_y;
 }
 
 
 void
-intel_miptree_set_image_offset_ex(struct intel_mipmap_tree *mt,
-                                  GLuint level, GLuint img,
-                                  GLuint x, GLuint y, 
-                                  GLuint offset)
+intel_miptree_set_image_offset(struct intel_mipmap_tree *mt,
+			       GLuint level, GLuint img,
+			       GLuint x, GLuint y)
 {
    if (img == 0 && level == 0)
       assert(x == 0 && y == 0);
 
    assert(img < mt->level[level].nr_images);
 
-   mt->level[level].image_offset[img] = (x + y * mt->pitch) * mt->cpp + offset;
+   mt->level[level].x_offset[img] = mt->level[level].level_x + x;
+   mt->level[level].y_offset[img] = mt->level[level].level_y + y;
 
-   DBG("%s level %d img %d pos %d,%d image_offset %x\n",
-       __FUNCTION__, level, img, x, y, mt->level[level].image_offset[img]);
+   DBG("%s level %d img %d pos %d,%d\n",
+       __FUNCTION__, level, img,
+       mt->level[level].x_offset[img], mt->level[level].y_offset[img]);
 }
 
 void
-intel_miptree_set_image_offset(struct intel_mipmap_tree *mt,
-			       GLuint level, GLuint img,
-			       GLuint x, GLuint y)
-{
-    intel_miptree_set_image_offset_ex(mt, level, img, x, y, 0);
-}
-
-
-/* Although we use the image_offset[] array to store relative offsets
- * to cube faces, Mesa doesn't know anything about this and expects
- * each cube face to be treated as a separate image.
- *
- * These functions present that view to mesa:
- */
-const GLuint *
-intel_miptree_depth_offsets(struct intel_mipmap_tree *mt, GLuint level)
-{
-   static const GLuint zero = 0;
-
-   if (mt->target != GL_TEXTURE_3D || mt->level[level].nr_images == 1)
-      return &zero;
-   else
-      return mt->level[level].image_offset;
-}
-
-
-GLuint
-intel_miptree_image_offset(struct intel_mipmap_tree *mt,
-			   GLuint face, GLuint level)
+intel_miptree_get_image_offset(struct intel_mipmap_tree *mt,
+			       GLuint level, GLuint face, GLuint depth,
+			       GLuint *x, GLuint *y)
 {
-   if (mt->target == GL_TEXTURE_CUBE_MAP_ARB)
-      return (mt->level[level].level_offset +
-	      mt->level[level].image_offset[face]);
-   else
-      return mt->level[level].level_offset;
+   if (mt->target == GL_TEXTURE_CUBE_MAP_ARB) {
+      *x = mt->level[level].x_offset[face];
+      *y = mt->level[level].y_offset[face];
+   } else if (mt->target == GL_TEXTURE_3D) {
+      *x = mt->level[level].x_offset[depth];
+      *y = mt->level[level].y_offset[depth];
+   } else {
+      *x = mt->level[level].x_offset[0];
+      *y = mt->level[level].y_offset[0];
+   }
 }
 
-
-
 /**
  * Map a teximage in a mipmap tree.
  * \param row_stride  returns row stride in bytes
@@ -441,6 +418,7 @@ intel_miptree_image_map(struct intel_context * intel,
                         GLuint level,
                         GLuint * row_stride, GLuint * image_offsets)
 {
+   GLuint x, y;
    DBG("%s \n", __FUNCTION__);
 
    if (row_stride)
@@ -449,17 +427,23 @@ intel_miptree_image_map(struct intel_context * intel,
    if (mt->target == GL_TEXTURE_3D) {
       int i;
 
-      for (i = 0; i < mt->level[level].depth; i++)
-	 image_offsets[i] = mt->level[level].image_offset[i] / mt->cpp;
+      for (i = 0; i < mt->level[level].depth; i++) {
+
+	 intel_miptree_get_image_offset(mt, level, face, i,
+					&x, &y);
+	 image_offsets[i] = x + y * mt->pitch;
+      }
+
+      return intel_region_map(intel, mt->region);
    } else {
       assert(mt->level[level].depth == 1);
-      assert(mt->target == GL_TEXTURE_CUBE_MAP ||
-	     mt->level[level].image_offset[0] == 0);
+      intel_miptree_get_image_offset(mt, level, face, 0,
+				     &x, &y);
       image_offsets[0] = 0;
-   }
 
-   return (intel_region_map(intel, mt->region) +
-           intel_miptree_image_offset(mt, face, level));
+      return intel_region_map(intel, mt->region) +
+	 (x + y * mt->pitch) * mt->cpp;
+   }
 }
 
 void
@@ -484,20 +468,19 @@ intel_miptree_image_data(struct intel_context *intel,
 			 GLuint src_image_pitch)
 {
    GLuint depth = dst->level[level].depth;
-   GLuint dst_offset = intel_miptree_image_offset(dst, face, level);
-   const GLuint *dst_depth_offset = intel_miptree_depth_offsets(dst, level);
    GLuint i;
-   GLuint height = 0;
 
    DBG("%s: %d/%d\n", __FUNCTION__, face, level);
    for (i = 0; i < depth; i++) {
+      GLuint dst_x, dst_y, height;
+
+      intel_miptree_get_image_offset(dst, level, face, i, &dst_x, &dst_y);
+
       height = dst->level[level].height;
       if(dst->compressed)
 	 height = (height + 3) / 4;
       intel_region_data(intel,
-			dst->region,
-			dst_offset + dst_depth_offset[i], /* dst_offset */
-			0, 0,                             /* dstx, dsty */
+			dst->region, 0, dst_x, dst_y,
 			src,
 			src_row_pitch,
 			0, 0,                             /* source x, y */
@@ -519,10 +502,7 @@ intel_miptree_image_copy(struct intel_context *intel,
    GLuint width = src->level[level].width;
    GLuint height = src->level[level].height;
    GLuint depth = src->level[level].depth;
-   GLuint dst_offset = intel_miptree_image_offset(dst, face, level);
-   GLuint src_offset = intel_miptree_image_offset(src, face, level);
-   const GLuint *dst_depth_offset = intel_miptree_depth_offsets(dst, level);
-   const GLuint *src_depth_offset = intel_miptree_depth_offsets(src, level);
+   GLuint src_x, src_y, dst_x, dst_y;
    GLuint i;
    GLboolean success;
 
@@ -535,22 +515,23 @@ intel_miptree_image_copy(struct intel_context *intel,
    }
 
    for (i = 0; i < depth; i++) {
+      intel_miptree_get_image_offset(src, level, face, i, &src_x, &src_y);
+      intel_miptree_get_image_offset(dst, level, face, i, &dst_x, &dst_y);
       success = intel_region_copy(intel,
-				  dst->region, dst_offset + dst_depth_offset[i],
-				  0, 0,
-				  src->region, src_offset + src_depth_offset[i],
-				  0, 0, width, height, GL_COPY);
+				  dst->region, 0, dst_x, dst_y,
+				  src->region, 0, src_x, src_y, width, height,
+				  GL_COPY);
       if (!success) {
 	 GLubyte *src_ptr, *dst_ptr;
 
 	 src_ptr = intel_region_map(intel, src->region);
 	 dst_ptr = intel_region_map(intel, dst->region);
 
-	 _mesa_copy_rect(dst_ptr + dst_offset + dst_depth_offset[i],
+	 _mesa_copy_rect(dst_ptr + dst->cpp * (dst_x + dst_y * dst->pitch),
 			 dst->cpp,
 			 dst->pitch,
 			 0, 0, width, height,
-			 src_ptr + src_offset + src_depth_offset[i],
+			 src_ptr + src->cpp * (src_x + src_y * src->pitch),
 			 src->pitch,
 			 0, 0);
 	 intel_region_unmap(intel, src->region);
diff --git a/src/mesa/drivers/dri/intel/intel_mipmap_tree.h b/src/mesa/drivers/dri/intel/intel_mipmap_tree.h
index c890b2a0d0..3bce54daa1 100644
--- a/src/mesa/drivers/dri/intel/intel_mipmap_tree.h
+++ b/src/mesa/drivers/dri/intel/intel_mipmap_tree.h
@@ -70,6 +70,10 @@ struct intel_mipmap_level
     * always zero in that case.
     */
    GLuint level_offset;
+   /** Offset to this miptree level, used in computing x_offset. */
+   GLuint level_x;
+   /** Offset to this miptree level, used in computing y_offset. */
+   GLuint level_y;
    GLuint width;
    GLuint height;
    /** Depth of the mipmap at this level: 1 for 1D/2D/CUBE, n for 3D. */
@@ -86,7 +90,7 @@ struct intel_mipmap_level
     * compute the offsets of depth/cube images within a mipmap level,
     * so have to store them as a lookup table.
     */
-   GLuint *image_offset;
+   GLuint *x_offset, *y_offset;
 };
 
 struct intel_mipmap_tree
@@ -176,19 +180,10 @@ GLubyte *intel_miptree_image_map(struct intel_context *intel,
 void intel_miptree_image_unmap(struct intel_context *intel,
                                struct intel_mipmap_tree *mt);
 
-
-/* Return the linear offset of an image relative to the start of the
- * tree:
- */
-GLuint intel_miptree_image_offset(struct intel_mipmap_tree *mt,
-                                  GLuint face, GLuint level);
-
-/* Return pointers to each 2d slice within an image.  Indexed by depth
- * value.
- */
-const GLuint *intel_miptree_depth_offsets(struct intel_mipmap_tree *mt,
-                                          GLuint level);
-
+void
+intel_miptree_get_image_offset(struct intel_mipmap_tree *mt,
+			       GLuint level, GLuint face, GLuint depth,
+			       GLuint *x, GLuint *y);
 
 void intel_miptree_set_level_info(struct intel_mipmap_tree *mt,
                                   GLuint level,
@@ -196,16 +191,10 @@ void intel_miptree_set_level_info(struct intel_mipmap_tree *mt,
                                   GLuint x, GLuint y,
                                   GLuint w, GLuint h, GLuint d);
 
-void intel_miptree_set_image_offset_ex(struct intel_mipmap_tree *mt,
-                                       GLuint level,
-                                       GLuint img, GLuint x, GLuint y,
-                                       GLuint offset);
-
 void intel_miptree_set_image_offset(struct intel_mipmap_tree *mt,
                                     GLuint level,
                                     GLuint img, GLuint x, GLuint y);
 
-
 /* Upload an image into a tree
  */
 void intel_miptree_image_data(struct intel_context *intel,
diff --git a/src/mesa/drivers/dri/intel/intel_regions.h b/src/mesa/drivers/dri/intel/intel_regions.h
index 0d379bdc6e..535fcd7be0 100644
--- a/src/mesa/drivers/dri/intel/intel_regions.h
+++ b/src/mesa/drivers/dri/intel/intel_regions.h
@@ -62,6 +62,8 @@ struct intel_region
    GLuint map_refcount;  /**< Reference count for mapping */
 
    GLuint draw_offset; /**< Offset of drawing address within the region */
+   GLuint draw_x, draw_y; /**< Offset of drawing within the region */
+
    uint32_t tiling; /**< Which tiling mode the region is in */
    uint32_t bit_6_swizzle; /**< GEM flag for address swizzling requirement */
    drmAddress classic_map; /**< drmMap of the region when not in GEM mode */
diff --git a/src/mesa/drivers/dri/intel/intel_tex_copy.c b/src/mesa/drivers/dri/intel/intel_tex_copy.c
index b241c11625..9d58b11b14 100644
--- a/src/mesa/drivers/dri/intel/intel_tex_copy.c
+++ b/src/mesa/drivers/dri/intel/intel_tex_copy.c
@@ -115,20 +115,22 @@ do_copy_texsubimage(struct intel_context *intel,
       drm_intel_bo *dst_bo = intel_region_buffer(intel,
 						 intelImage->mt->region,
 						 INTEL_WRITE_PART);
-      GLuint image_offset = intel_miptree_image_offset(intelImage->mt,
-                                                       intelImage->face,
-                                                       intelImage->level);
       const GLint orig_x = x;
       const GLint orig_y = y;
+      GLuint image_x, image_y;
       GLshort src_pitch;
 
+      intel_miptree_get_image_offset(intelImage->mt,
+				     intelImage->level,
+				     intelImage->face,
+				     0,
+				     &image_x, &image_y);
       /* Update dst for clipped src.  Need to also clip the source rect. */
       dstx += x - orig_x;
       dsty += y - orig_y;
 
       /* Can't blit to tiled buffers with non-tile-aligned offset. */
-      if (intelImage->mt->region->tiling != I915_TILING_NONE &&
-	  (image_offset & 4095) != 0) {
+      if (intelImage->mt->region->tiling == I915_TILING_Y) {
 	 UNLOCK_HARDWARE(intel);
 	 return GL_FALSE;
       }
@@ -160,9 +162,10 @@ do_copy_texsubimage(struct intel_context *intel,
 			     src->tiling,
 			     intelImage->mt->pitch,
 			     dst_bo,
-			     image_offset,
+			     0,
 			     intelImage->mt->region->tiling,
-			     x, y, dstx, dsty, width, height,
+			     x, y, image_x + dstx, image_y + dsty,
+			     width, height,
 			     GL_COPY)) {
 	 UNLOCK_HARDWARE(intel);
 	 return GL_FALSE;
diff --git a/src/mesa/drivers/dri/intel/intel_tex_image.c b/src/mesa/drivers/dri/intel/intel_tex_image.c
index c5f5220837..2e0945c365 100644
--- a/src/mesa/drivers/dri/intel/intel_tex_image.c
+++ b/src/mesa/drivers/dri/intel/intel_tex_image.c
@@ -204,7 +204,7 @@ try_pbo_upload(struct intel_context *intel,
 {
    struct intel_buffer_object *pbo = intel_buffer_object(unpack->BufferObj);
    GLuint src_offset, src_stride;
-   GLuint dst_offset, dst_stride;
+   GLuint dst_x, dst_y, dst_stride;
 
    if (unpack->BufferObj->Name == 0 ||
        intel->ctx._ImageTransferState ||
@@ -221,9 +221,9 @@ try_pbo_upload(struct intel_context *intel,
    else
       src_stride = width;
 
-   dst_offset = intel_miptree_image_offset(intelImage->mt,
-                                           intelImage->face,
-                                           intelImage->level);
+   intel_miptree_get_image_offset(intelImage->mt, intelImage->level,
+				  intelImage->face, 0,
+				  &dst_x, &dst_y);
 
    dst_stride = intelImage->mt->pitch;
 
@@ -239,8 +239,8 @@ try_pbo_upload(struct intel_context *intel,
       if (!intelEmitCopyBlit(intel,
 			     intelImage->mt->cpp,
 			     src_stride, src_buffer, src_offset, GL_FALSE,
-			     dst_stride, dst_buffer, dst_offset, GL_FALSE,
-			     0, 0, 0, 0, width, height,
+			     dst_stride, dst_buffer, 0, GL_FALSE,
+			     0, 0, dst_x, dst_y, width, height,
 			     GL_COPY)) {
 	 UNLOCK_HARDWARE(intel);
 	 return GL_FALSE;
@@ -262,7 +262,7 @@ try_pbo_zcopy(struct intel_context *intel,
 {
    struct intel_buffer_object *pbo = intel_buffer_object(unpack->BufferObj);
    GLuint src_offset, src_stride;
-   GLuint dst_offset, dst_stride;
+   GLuint dst_x, dst_y, dst_stride;
 
    if (unpack->BufferObj->Name == 0 ||
        intel->ctx._ImageTransferState ||
@@ -279,13 +279,14 @@ try_pbo_zcopy(struct intel_context *intel,
    else
       src_stride = width;
 
-   dst_offset = intel_miptree_image_offset(intelImage->mt,
-                                           intelImage->face,
-                                           intelImage->level);
+   intel_miptree_get_image_offset(intelImage->mt, intelImage->level,
+				  intelImage->face, 0,
+				  &dst_x, &dst_y);
 
    dst_stride = intelImage->mt->pitch;
 
-   if (src_stride != dst_stride || dst_offset != 0 || src_offset != 0) {
+   if (src_stride != dst_stride || dst_x != 0 || dst_y != 0 ||
+       src_offset != 0) {
       DBG("%s: failure 2\n", __FUNCTION__);
       return GL_FALSE;
    }