diff options
| -rw-r--r-- | src/mesa/state_tracker/st_cb_blit.c | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/src/mesa/state_tracker/st_cb_blit.c b/src/mesa/state_tracker/st_cb_blit.c index a236a08e95e..82c2e38e57f 100644 --- a/src/mesa/state_tracker/st_cb_blit.c +++ b/src/mesa/state_tracker/st_cb_blit.c @@ -44,6 +44,34 @@ static void +st_adjust_blit_for_msaa_resolve(struct pipe_blit_info *blit) +{ + /* Even though we do multisample resolves at the time of the blit, OpenGL + * specification defines them as if they happen at the time of rendering, + * which means that the type of averaging we do during the resolve should + * only depend on the source format; the destination format should be + * ignored. But, specification doesn't seem to be strict about it. + * + * It has been observed that mulitisample resolves produce slightly better + * looking images when averaging is done using destination format. NVIDIA's + * proprietary OpenGL driver also follows this approach. + * + * When multisampling, if the source and destination formats are equal + * (aside from the color space), we choose to blit in sRGB space to get + * this higher quality image. + */ + if (blit->src.resource->nr_samples > 1 && + blit->dst.resource->nr_samples <= 1) { + blit->dst.format = blit->dst.resource->format; + + if (util_format_is_srgb(blit->dst.resource->format)) + blit->src.format = util_format_srgb(blit->src.resource->format); + else + blit->src.format = util_format_linear(blit->src.resource->format); + } +} + +static void st_BlitFramebuffer(struct gl_context *ctx, GLint srcX0, GLint srcY0, GLint srcX1, GLint srcY1, GLint dstX0, GLint dstY0, GLint dstX1, GLint dstY1, @@ -192,6 +220,8 @@ st_BlitFramebuffer(struct gl_context *ctx, blit.src.box.z = srcAtt->Zoffset + srcAtt->CubeMapFace; blit.src.format = util_format_linear(srcObj->pt->format); + st_adjust_blit_for_msaa_resolve(&blit); + st->pipe->blit(st->pipe, &blit); } } @@ -227,6 +257,8 @@ st_BlitFramebuffer(struct gl_context *ctx, blit.src.box.z = srcSurf->u.tex.first_layer; blit.src.format = util_format_linear(srcSurf->format); + st_adjust_blit_for_msaa_resolve(&blit); + st->pipe->blit(st->pipe, &blit); } } |