diff options
| -rw-r--r-- | src/mesa/state_tracker/st_cb_readpixels.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/src/mesa/state_tracker/st_cb_readpixels.c b/src/mesa/state_tracker/st_cb_readpixels.c index 952d9ce9156..8cc9cfac76f 100644 --- a/src/mesa/state_tracker/st_cb_readpixels.c +++ b/src/mesa/state_tracker/st_cb_readpixels.c @@ -241,6 +241,7 @@ st_fast_readpixels(GLcontext *ctx, struct st_renderbuffer *strb, GLint row, col, dy, dstStride; if (st_fb_orientation(ctx->ReadBuffer) == Y_0_TOP) { + /* convert GL Y to Gallium Y */ y = strb->texture->height0 - y - height; } @@ -258,11 +259,16 @@ st_fast_readpixels(GLcontext *ctx, struct st_renderbuffer *strb, return GL_FALSE; } + /* We always write to the user/dest buffer from low addr to high addr + * but the read order depends on renderbuffer orientation + */ if (st_fb_orientation(ctx->ReadBuffer) == Y_0_TOP) { + /* read source rows from bottom to top */ y = height - 1; dy = -1; } else { + /* read source rows from top to bottom */ y = 0; dy = 1; } @@ -396,6 +402,7 @@ st_readpixels(GLcontext *ctx, GLint x, GLint y, GLsizei width, GLsizei height, } if (st_fb_orientation(ctx->ReadBuffer) == Y_0_TOP) { + /* convert GL Y to Gallium Y */ y = strb->Base.Height - y - height; } |