diff options
| author | Brian Paul <brian.paul@tungstengraphics.com> | 2008-04-25 09:46:43 -0600 |
|---|---|---|
| committer | Brian Paul <brian.paul@tungstengraphics.com> | 2008-04-29 18:37:41 -0600 |
| commit | 4e0e02ae684c0286599309ae166cfc716db940d7 (patch) | |
| tree | 9887da2b66ae173f11126c023339779970a53aa7 /src/mesa/main/drawpix.c | |
| parent | 4f474c7d1e1e6807af0f3db55f641fbd66be2e90 (diff) | |
mesa: adjust glBitmap coords by a small epsilon
Fixes problem with bitmaps jumping around by one pixel depending on window
size. The rasterpos is often X.9999 instead of X+1.
Run progs/redbook/drawf and resize window to check.
Cherry picked from gallium-0.1 branch
Diffstat (limited to 'src/mesa/main/drawpix.c')
| -rw-r--r-- | src/mesa/main/drawpix.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/src/mesa/main/drawpix.c b/src/mesa/main/drawpix.c index 4f28766674..fde9338430 100644 --- a/src/mesa/main/drawpix.c +++ b/src/mesa/main/drawpix.c @@ -374,8 +374,9 @@ _mesa_Bitmap( GLsizei width, GLsizei height, if (ctx->RenderMode == GL_RENDER) { /* Truncate, to satisfy conformance tests (matches SGI's OpenGL). */ - GLint x = IFLOOR(ctx->Current.RasterPos[0] - xorig); - GLint y = IFLOOR(ctx->Current.RasterPos[1] - yorig); + const GLfloat epsilon = 0.0001; + GLint x = IFLOOR(ctx->Current.RasterPos[0] + epsilon - xorig); + GLint y = IFLOOR(ctx->Current.RasterPos[1] + epsilon - yorig); if (ctx->Unpack.BufferObj->Name) { /* unpack from PBO */ |