Mesa (master): st: Allow accelerated CopyTexImage from RGBA to RGB.

[Eric Anholt]

Module: Mesa
Branch: master
Commit: d491ad1d364afa60eef5cf7b45f69f7007ab3dfd
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=d491ad1d364afa60eef5cf7b45f69f7007ab3dfd

Author: Eric Anholt <eric at anholt.net>
Date:   Wed Mar 21 11:43:28 2018 -0700

st: Allow accelerated CopyTexImage from RGBA to RGB.

There's nothing to worry about here -- the A channel just gets dropped by
the blit.  This avoids a segfault in the fallback path when copying from a
RGBA16_SINT renderbuffer to a RGB16_SINT destination represented by an
RGBA16_SINT texture (the fallback path tries to get/fetch to float
buffers, but the float pack/unpack functions are NULL for SINT/UINT).

Fixes KHR-GLES3.packed_pixels.pbo_rectangle.rgba16i on VC5.

v2: Extract the logic to a helper function and explain what's going on
    better.
v3: const-qualify args

Reviewed-by: Brian Paul <brianp at vmware.com>

---

 src/mesa/state_tracker/st_cb_texture.c | 32 ++++++++++++++++++++++++++------
 1 file changed, 26 insertions(+), 6 deletions(-)

diff --git a/src/mesa/state_tracker/st_cb_texture.c b/src/mesa/state_tracker/st_cb_texture.c
index 6345ead639..3a793a7265 100644
--- a/src/mesa/state_tracker/st_cb_texture.c
+++ b/src/mesa/state_tracker/st_cb_texture.c
@@ -2281,6 +2281,31 @@ fallback_copy_texsubimage(struct gl_context *ctx,
    pipe->transfer_unmap(pipe, src_trans);
 }
 
+static bool
+st_can_copyteximage_using_blit(const struct gl_texture_image *texImage,
+                               const struct gl_renderbuffer *rb)
+{
+   GLenum tex_baseformat = _mesa_get_format_base_format(texImage->TexFormat);
+
+   /* We don't blit to a teximage where the GL base format doesn't match the
+    * texture's chosen format, except in the case of a GL_RGB texture
+    * represented with GL_RGBA (where the alpha channel is just being
+    * dropped).
+    */
+   if (texImage->_BaseFormat != tex_baseformat &&
+       ((texImage->_BaseFormat != GL_RGB || tex_baseformat != GL_RGBA))) {
+      return false;
+   }
+
+   /* We can't blit from a RB where the GL base format doesn't match the RB's
+    * chosen format (for example, GL RGB or ALPHA with rb->Format of an RGBA
+    * type, because the other channels will be undefined).
+    */
+   if (rb->_BaseFormat != _mesa_get_format_base_format(rb->Format))
+      return false;
+
+   return true;
+}
 
 /**
  * Do a CopyTex[Sub]Image1/2/3D() using a hardware (blit) path if possible.
@@ -2324,12 +2349,7 @@ st_CopyTexSubImage(struct gl_context *ctx, GLuint dims,
       goto fallback;
    }
 
-   /* The base internal format must match the mesa format, so make sure
-    * e.g. an RGB internal format is really allocated as RGB and not as RGBA.
-    */
-   if (texImage->_BaseFormat !=
-       _mesa_get_format_base_format(texImage->TexFormat) ||
-       rb->_BaseFormat != _mesa_get_format_base_format(rb->Format)) {
+   if (!st_can_copyteximage_using_blit(texImage, rb)) {
       goto fallback;
    }