diff options
| -rw-r--r-- | tests/spec/glsl-1.30/execution/fs-texelFetchOffset-2D.c | 29 |
1 files changed, 23 insertions, 6 deletions
diff --git a/tests/spec/glsl-1.30/execution/fs-texelFetchOffset-2D.c b/tests/spec/glsl-1.30/execution/fs-texelFetchOffset-2D.c index 19e3654ff..8bdca7ac9 100644 --- a/tests/spec/glsl-1.30/execution/fs-texelFetchOffset-2D.c +++ b/tests/spec/glsl-1.30/execution/fs-texelFetchOffset-2D.c @@ -76,7 +76,7 @@ piglit_display(void) bool pass = true; float red[4] = {1.0, 0.0, 0.0, 1.0}; float blue[4] = {0.0, 0.0, 1.0, 1.0}; - float black[4] = {0.0, 0.0, 0.0, 1.0}; + float undefined[4] = {0.0, 0.0, 0.0, 0.0}; glClearColor(0.5, 0.5, 0.5, 1.0); glClear(GL_COLOR_BUFFER_BIT); @@ -92,12 +92,29 @@ piglit_display(void) for (q = 0; q < 4; q++) { const int tex_x = (q / 2) * ((width / 2)); const int tex_y = (q % 2) * ((height / 2)); - float *c = black; + float *c = undefined; const int x = 10+20*q; - /* fancy stuff - we should see red and blue - due to the offset for 3 levels, - otherwise we get lots of black border color */ + /* fancy stuff - we should see some red and blue + * due to the offset for 3 levels, all the rest is + * undefined due to out-of-bounds. + * Only with ARB_robust_buffer_access_behavior + * (and a robust context) the undefined result would + * be guaranteed to be zero instead. + * + * From the GL 3.0 spec, page 105 ("Texel Fetches"): + * + * "The results of the texel fetch are + * undefined if any of the following + * conditions hold: + * + * ... + * + * - The texel coordinates refer to a + * border texel outside of the defined + * extents of the specified LOD" + */ + if (l < 3) { if (q == 2) c = red; else if (q == 3) c = blue; @@ -107,7 +124,7 @@ piglit_display(void) piglit_Uniform2i(pos_location, tex_x, tex_y); piglit_draw_rect(x, y, 10, 10); - if (width > 2) /* below 1 wide no test */ + if (width > 2 && c != undefined) /* below 1 wide no test */ pass &= piglit_probe_rect_rgba(x, y, 10, 10, c); } } |