From ab6c4fa582972e25f8800c77b5dd5b3a83afc996 Mon Sep 17 00:00:00 2001 From: Robert Ellison Date: Wed, 13 May 2009 20:40:23 -0600 Subject: i965: fix 1D texture borders with GL_CLAMP_TO_BORDER With 1D textures, GL_TEXTURE_WRAP_T should be ignored (only GL_TEXTURE_WRAP_S should be respected). But the i965 hardware seems to follow the value of GL_TEXTURE_WRAP_T even when sampling 1D textures. This fix forces GL_TEXTURE_WRAP_T to be GL_REPEAT whenever 1D textures are used; this allows the texture to be sampled correctly, avoiding "imaginary" border elements in the T direction. This bug was demonstrated in the Piglit tex1d-2dborder test. With this fix, that test passes. --- src/mesa/drivers/dri/i965/brw_wm_sampler_state.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/src/mesa/drivers/dri/i965/brw_wm_sampler_state.c b/src/mesa/drivers/dri/i965/brw_wm_sampler_state.c index c604ef0162..3fc18ff1f3 100644 --- a/src/mesa/drivers/dri/i965/brw_wm_sampler_state.c +++ b/src/mesa/drivers/dri/i965/brw_wm_sampler_state.c @@ -178,6 +178,16 @@ static void brw_update_sampler_state(struct wm_sampler_entry *key, sampler->ss1.s_wrap_mode = BRW_TEXCOORDMODE_CUBE; sampler->ss1.t_wrap_mode = BRW_TEXCOORDMODE_CUBE; } + else if (key->tex_target == GL_TEXTURE_1D) { + /* There's a bug in 1D texture sampling - it actually pays + * attention to the wrap_t value, though it should not. + * Override the wrap_t value here to GL_REPEAT to keep + * any nonexistent border pixels from floating in. + */ + sampler->ss1.r_wrap_mode = translate_wrap_mode(key->wrap_r); + sampler->ss1.s_wrap_mode = translate_wrap_mode(key->wrap_s); + sampler->ss1.t_wrap_mode = BRW_TEXCOORDMODE_WRAP; + } else { sampler->ss1.r_wrap_mode = translate_wrap_mode(key->wrap_r); sampler->ss1.s_wrap_mode = translate_wrap_mode(key->wrap_s); -- cgit v1.2.3