added description of faster glDraw/CopyPixels code
diff --git a/docs/RELNOTES-5.1 b/docs/RELNOTES-5.1
index 95a4b8e..2a1137b 100644
--- a/docs/RELNOTES-5.1
+++ b/docs/RELNOTES-5.1
@@ -75,6 +75,24 @@
GL_SUN_multi_draw_arrays
An alias for GL_EXT_multi_draw_arrays, standard in OpenGL 1.4.
+Faster glDrawPixels / glCopyPixels in X11 driver
+ If your X screen is 32bpp, glDrawPixels to the front color buffer will
+ be accelerated (via XPutImage()) if the image format is GL_BGRA and the
+ type is GL_UNSIGNED_BYTE. No raster operations, such as depth test,
+ blend, fog, etc. can be enabled.
+
+ If your X screen is 16bpp, glDrawPixels to the front color buffer will
+ be accelerated (via XPutImage()) if the image format is GL_RGB and the
+ type is GL_UNSIGNED_SHORT_5_6_5. No raster operations, such as depth
+ test, blend, fog, etc. can be enabled.
+
+ glCopyPixels() calls for the front color buffer will be accelerated
+ (via XCopyArea()) if no raster operations, such as depth test, blend,
+ fog, pixel zoom, etc. are enabled.
+
+ The speed-up over typical software rendering is a factor of 10 for
+ glDrawPixels and 100 for glCopyPixels.
+
With the addition of GL_ARB_occlusion_query, GL_ARB_vertex_buffer_object,
GL_ARB_texture_non_power_of_two and GL_EXT_shadow_funcs, Mesa 5.1 supports