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mesa: adjust glBitmap coords by a small epsilon

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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
This commit is contained in:
Brian Paul
2008-04-25 09:46:43 -06:00
parent 4f474c7d1e
commit 4e0e02ae68
1 changed files with 3 additions and 2 deletions
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src/mesa/main/drawpix.c
+3 -2
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@@ -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 */