st/mesa: implement blit-based TexImage and TexSubImage

A temporary texture is created such that it matches the format and type
combination and pixels are copied to it using memcpy. Then the blit is used to
copy the temporary texture to the texture image being modified by TexImage or
TexSubImage. The blit takes care of the format and type conversion and
swizzling. The result is a very fast texture upload involving as little CPU
as possible.

This improves performance in apps which upload textures during rendering.
An example is the Wine OpenGL backend for DirectDraw, which I used to test
the game StarCraft. Profiling had shown that TexSubImage was taking 50% of
CPU time without this patch, which was the main motivation for this work, and
now TexSubImage only takes 14% of CPU time. I had to underclock my CPU to see
any difference in the game and this patch does make the game a lot faster
if the CPU is slow (or using the powersave cpufreq profile).

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

1 files changed, 7 insertions, 0 deletions

diff --git a/src/mesa/main/texstore.h b/src/mesa/main/texstore.h
index 7af532d..107f213 100644
--- a/src/mesa/main/texstore.h
+++ b/src/mesa/main/texstore.h
@@ -70,6 +70,13 @@ extern GLboolean
 _mesa_texstore(TEXSTORE_PARAMS);
 
 
+extern GLboolean
+_mesa_texstore_can_use_memcpy(struct gl_context *ctx,
+                              GLenum baseInternalFormat, gl_format dstFormat,
+                              GLenum srcFormat, GLenum srcType,
+                              const struct gl_pixelstore_attrib *srcPacking);
+
+
 extern GLubyte *
 _mesa_make_temp_ubyte_image(struct gl_context *ctx, GLuint dims,
                            GLenum logicalBaseFormat,