diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/mesa/drivers/dri/intel/intel_tex_copy.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/src/mesa/drivers/dri/intel/intel_tex_copy.c b/src/mesa/drivers/dri/intel/intel_tex_copy.c index 1af7b1c5671..c9cbcf480d5 100644 --- a/src/mesa/drivers/dri/intel/intel_tex_copy.c +++ b/src/mesa/drivers/dri/intel/intel_tex_copy.c @@ -70,6 +70,27 @@ intel_copy_texsubimage(struct intel_context *intel, assert(region); } + /* According to the Ivy Bridge PRM, Vol1 Part4, section 1.2.1.2 (Graphics + * Data Size Limitations): + * + * The BLT engine is capable of transferring very large quantities of + * graphics data. Any graphics data read from and written to the + * destination is permitted to represent a number of pixels that + * occupies up to 65,536 scan lines and up to 32,768 bytes per scan line + * at the destination. The maximum number of pixels that may be + * represented per scan line’s worth of graphics data depends on the + * color depth. + * + * Furthermore, intelEmitCopyBlit (which is called below) uses a signed + * 16-bit integer to represent buffer pitch, so it can only handle buffer + * pitches < 32k. + * + * As a result of these two limitations, we can only use the blitter to do + * this copy when the region's pitch is less than 32k. + */ + if (region->pitch >= 32768) + return false; + if (intelImage->base.Base.TexObject->Target == GL_TEXTURE_1D_ARRAY || intelImage->base.Base.TexObject->Target == GL_TEXTURE_2D_ARRAY) { perf_debug("no support for array textures\n"); |