diff options
Diffstat (limited to 'src/mesa/drivers/dri')
| -rw-r--r-- | src/mesa/drivers/dri/i965/brw_defines.h | 18 | ||||
| -rw-r--r-- | src/mesa/drivers/dri/i965/brw_sf_state.c | 28 |
2 files changed, 45 insertions, 1 deletions
diff --git a/src/mesa/drivers/dri/i965/brw_defines.h b/src/mesa/drivers/dri/i965/brw_defines.h index 590b064c7e..74dbba4fdd 100644 --- a/src/mesa/drivers/dri/i965/brw_defines.h +++ b/src/mesa/drivers/dri/i965/brw_defines.h @@ -225,6 +225,24 @@ #define BRW_RASTRULE_UPPER_LEFT 0 #define BRW_RASTRULE_UPPER_RIGHT 1 +/* These are listed as "Reserved, but not seen as useful" + * in Intel documentation (page 212, "Point Rasterization Rule", + * section 7.4 "SF Pipeline State Summary", of document + * "Intel® 965 Express Chipset Family and Intel® G35 Express + * Chipset Graphics Controller Programmer's Reference Manual, + * Volume 2: 3D/Media", Revision 1.0b as of January 2008, + * available at + * http://intellinuxgraphics.org/documentation.html + * at the time of this writing). + * + * These appear to be supported on at least some + * i965-family devices, and the BRW_RASTRULE_LOWER_RIGHT + * is useful when using OpenGL to render to a FBO + * (which has the pixel coordinate Y orientation inverted + * with respect to the normal OpenGL pixel coordinate system). + */ +#define BRW_RASTRULE_LOWER_LEFT 2 +#define BRW_RASTRULE_LOWER_RIGHT 3 #define BRW_RENDERTARGET_CLAMPRANGE_UNORM 0 #define BRW_RENDERTARGET_CLAMPRANGE_SNORM 1 diff --git a/src/mesa/drivers/dri/i965/brw_sf_state.c b/src/mesa/drivers/dri/i965/brw_sf_state.c index 93a9686f71..fc4eddda0a 100644 --- a/src/mesa/drivers/dri/i965/brw_sf_state.c +++ b/src/mesa/drivers/dri/i965/brw_sf_state.c @@ -231,7 +231,33 @@ sf_unit_create_from_key(struct brw_context *brw, struct brw_sf_unit_key *key, sf.sf6.line_width = 0; /* _NEW_POINT */ - sf.sf6.point_rast_rule = BRW_RASTRULE_UPPER_RIGHT; /* opengl conventions */ + key->render_to_fbo = brw->intel.ctx.DrawBuffer->Name != 0; + if (!key->render_to_fbo) { + /* Rendering to an OpenGL window */ + sf.sf6.point_rast_rule = BRW_RASTRULE_UPPER_RIGHT; + } + else { + /* If rendering to an FBO, the pixel coordinate system is + * inverted with respect to the normal OpenGL coordinate + * system, so BRW_RASTRULE_LOWER_RIGHT is correct. + * But this value is listed as "Reserved, but not seen as useful" + * in Intel documentation (page 212, "Point Rasterization Rule", + * section 7.4 "SF Pipeline State Summary", of document + * "Intel® 965 Express Chipset Family and Intel® G35 Express + * Chipset Graphics Controller Programmer's Reference Manual, + * Volume 2: 3D/Media", Revision 1.0b as of January 2008, + * available at + * http://intellinuxgraphics.org/documentation.html + * at the time of this writing). + * + * It does work on at least some devices, if not all; + * if devices that don't support it can be identified, + * the likely failure case is that points are rasterized + * incorrectly, which is no worse than occurs without + * the value, so we're using it here. + */ + sf.sf6.point_rast_rule = BRW_RASTRULE_LOWER_RIGHT; + } /* XXX clamp max depends on AA vs. non-AA */ sf.sf7.sprite_point = key->point_sprite; |