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st/mesa: fix Y inversion and optimize st_BlitFramebuffer()

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Need to check for Y inversion separately for src/dest buffers.

If both the src and dest regions are upside down, make them right-side
up for a better chance at a fast path.

progs/tests/copypixrate -blit is much faster now.
This commit is contained in:
Brian Paul
2009-08-05 13:26:19 -06:00
parent 2cd33afa00
commit f792137593
1 changed files with 26 additions and 4 deletions
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30
src/mesa/state_tracker/st_cb_blit.c
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@@ -75,6 +75,11 @@ st_BlitFramebuffer(GLcontext *ctx,
? PIPE_TEX_MIPFILTER_NEAREST
: PIPE_TEX_MIPFILTER_LINEAR);
if (!_mesa_clip_blit(ctx, &srcX0, &srcY0, &srcX1, &srcY1,
&dstX0, &dstY0, &dstX1, &dstY1)) {
return; /* nothing to draw/blit */
}
if (mask & GL_COLOR_BUFFER_BIT) {
struct st_renderbuffer *srcRb =
st_renderbuffer(ctx->ReadBuffer->_ColorReadBuffer);
@@ -84,14 +89,31 @@ st_BlitFramebuffer(GLcontext *ctx,
struct pipe_surface *dstSurf = dstRb->surface;
if (st_fb_orientation(ctx->DrawBuffer) == Y_0_TOP) {
/* invert Y */
srcY0 = srcRb->Base.Height - srcY0;
srcY1 = srcRb->Base.Height - srcY1;
/* invert Y for dest */
dstY0 = dstRb->Base.Height - dstY0;
dstY1 = dstRb->Base.Height - dstY1;
}
if (st_fb_orientation(ctx->ReadBuffer) == Y_0_TOP) {
/* invert Y for src */
srcY0 = srcRb->Base.Height - srcY0;
srcY1 = srcRb->Base.Height - srcY1;
}
if (srcY0 > srcY1 && dstY0 > dstY1) {
/* Both src and dst are upside down. Swap Y to make it
* right-side up to increase odds of using a fast path.
* Recall that all Gallium raster coords have Y=0=top.
*/
GLint tmp;
tmp = srcY0;
srcY0 = srcY1;
srcY1 = tmp;
tmp = dstY0;
dstY0 = dstY1;
dstY1 = tmp;
}
util_blit_pixels(st->blit,
srcSurf, srcX0, srcY0, srcX1, srcY1,
dstSurf, dstX0, dstY0, dstX1, dstY1,