Mesa (7.8): i965: Fix inversion for glCopyPixels to/from FBOs.

[Eric Anholt]

Module: Mesa
Branch: 7.8
Commit: 63fbae81e00964ccaf4c15d031893f5110b702a6
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=63fbae81e00964ccaf4c15d031893f5110b702a6

Author: Eric Anholt <eric at anholt.net>
Date:   Wed Mar 24 14:28:45 2010 -0700

i965: Fix inversion for glCopyPixels to/from FBOs.

fixes piglit fbo-copypix.
(cherry picked from commit a589da14dee0c2a32e6e529f1a390b01a3ee4001)

---

 src/mesa/drivers/dri/intel/intel_mipmap_tree.c |    3 ++-
 src/mesa/drivers/dri/intel/intel_pixel_copy.c  |   21 ++++++++++-----------
 src/mesa/drivers/dri/intel/intel_regions.c     |    8 +++++++-
 src/mesa/drivers/dri/intel/intel_regions.h     |    1 +
 4 files changed, 20 insertions(+), 13 deletions(-)

diff --git a/src/mesa/drivers/dri/intel/intel_mipmap_tree.c b/src/mesa/drivers/dri/intel/intel_mipmap_tree.c
index 9f51a3e..5b6b4b2 100644
--- a/src/mesa/drivers/dri/intel/intel_mipmap_tree.c
+++ b/src/mesa/drivers/dri/intel/intel_mipmap_tree.c
@@ -518,7 +518,8 @@ intel_miptree_image_copy(struct intel_context *intel,
       intel_miptree_get_image_offset(dst, level, face, i, &dst_x, &dst_y);
       success = intel_region_copy(intel,
 				  dst->region, 0, dst_x, dst_y,
-				  src->region, 0, src_x, src_y, width, height,
+				  src->region, 0, src_x, src_y,
+				  width, height, GL_FALSE,
 				  GL_COPY);
       if (!success) {
 	 GLubyte *src_ptr, *dst_ptr;
diff --git a/src/mesa/drivers/dri/intel/intel_pixel_copy.c b/src/mesa/drivers/dri/intel/intel_pixel_copy.c
index 757f2f7..56faf07 100644
--- a/src/mesa/drivers/dri/intel/intel_pixel_copy.c
+++ b/src/mesa/drivers/dri/intel/intel_pixel_copy.c
@@ -116,6 +116,7 @@ do_blit_copypixels(GLcontext * ctx,
    GLint orig_dsty;
    GLint orig_srcx;
    GLint orig_srcy;
+   GLboolean flip = GL_FALSE;
 
    if (type == GL_DEPTH || type == GL_STENCIL) {
       if (INTEL_DEBUG & DEBUG_FALLBACKS)
@@ -143,8 +144,6 @@ do_blit_copypixels(GLcontext * ctx,
 
    intelFlush(&intel->ctx);
 
-   /* XXX: We fail to handle different inversion between read and draw framebuffer. */
-
    /* Clip to destination buffer. */
    orig_dstx = dstx;
    orig_dsty = dsty;
@@ -167,23 +166,23 @@ do_blit_copypixels(GLcontext * ctx,
    dstx += srcx - orig_srcx;
    dsty += srcy - orig_srcy;
 
-   /* Convert from GL to hardware coordinates: */
+   /* Flip dest Y if it's a window system framebuffer. */
    if (fb->Name == 0) {
-      /* copypixels to a system framebuffer */
+      /* copypixels to a window system framebuffer */
       dsty = fb->Height - dsty - height;
-   } else {
-      /* copypixels to a user framebuffer object */
-      dsty = dsty;
+      flip = !flip;
    }
 
-   /* Flip source Y if it's a system framebuffer. */
-   if (read_fb->Name == 0)
-      srcy = fb->Height - srcy - height;
+   /* Flip source Y if it's a window system framebuffer. */
+   if (read_fb->Name == 0) {
+      srcy = read_fb->Height - srcy - height;
+      flip = !flip;
+   }
 
    if (!intel_region_copy(intel,
 			  dst, 0, dstx, dsty,
 			  src, 0, srcx, srcy,
-			  width, height,
+			  width, height, flip,
 			  ctx->Color.ColorLogicOpEnabled ?
 			  ctx->Color.LogicOp : GL_COPY)) {
       DBG("%s: blit failure\n", __FUNCTION__);
diff --git a/src/mesa/drivers/dri/intel/intel_regions.c b/src/mesa/drivers/dri/intel/intel_regions.c
index 193bbf6..1172de9 100644
--- a/src/mesa/drivers/dri/intel/intel_regions.c
+++ b/src/mesa/drivers/dri/intel/intel_regions.c
@@ -371,8 +371,11 @@ intel_region_copy(struct intel_context *intel,
                   struct intel_region *src,
                   GLuint src_offset,
                   GLuint srcx, GLuint srcy, GLuint width, GLuint height,
+		  GLboolean flip,
 		  GLenum logicop)
 {
+   uint32_t src_pitch = src->pitch;
+
    _DBG("%s\n", __FUNCTION__);
 
    if (intel == NULL)
@@ -388,9 +391,12 @@ intel_region_copy(struct intel_context *intel,
 
    assert(src->cpp == dst->cpp);
 
+   if (flip)
+      src_pitch = -src_pitch;
+
    return intelEmitCopyBlit(intel,
 			    dst->cpp,
-			    src->pitch, src->buffer, src_offset, src->tiling,
+			    src_pitch, src->buffer, src_offset, src->tiling,
 			    dst->pitch, dst->buffer, dst_offset, dst->tiling,
 			    srcx, srcy, dstx, dsty, width, height,
 			    logicop);
diff --git a/src/mesa/drivers/dri/intel/intel_regions.h b/src/mesa/drivers/dri/intel/intel_regions.h
index e3dc1ba..2459c9a 100644
--- a/src/mesa/drivers/dri/intel/intel_regions.h
+++ b/src/mesa/drivers/dri/intel/intel_regions.h
@@ -121,6 +121,7 @@ intel_region_copy(struct intel_context *intel,
 		  struct intel_region *src,
 		  GLuint src_offset,
 		  GLuint srcx, GLuint srcy, GLuint width, GLuint height,
+		  GLboolean flip,
 		  GLenum logicop);
 
 /* Helpers for zerocopy uploads, particularly texture image uploads: