From 72c8d2f2449d54005eb721fe3853a6009e9b8d17 Mon Sep 17 00:00:00 2001 From: Brian Paul Date: Thu, 24 Apr 2008 13:36:26 -0600 Subject: [PATCH] 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. --- src/mesa/main/drawpix.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/src/mesa/main/drawpix.c b/src/mesa/main/drawpix.c index 0f64f1c1c0c..fa422bb3c76 100644 --- a/src/mesa/main/drawpix.c +++ b/src/mesa/main/drawpix.c @@ -377,8 +377,9 @@ _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 */ -- 2.30.2