In this test we use GL_BGRA + GL_UNSIGNED_BYTE. However, the probe function receives two 4-byte values to compare, expected and observed. This is wrong as the correct way to compare array_of_bytes (GL_UNSIGNED_BYTE) in an endian-safe way is by comparing memory (and not values).
This patch fixes this bug by changing the function to receive two pointers instead of values. It also corrects the way the expected values are constructed to be in endian-safe way for array-of-bytes This fixes the test in llvmpipe, softpipe and r600g in big-endian machine. v2: Changed initialization of expected results to be more clear Signed-off-by: Oded Gabbay <[email protected]> --- tests/fbo/fbo-pbo-readpixels-small.c | 27 +++++++++++++++++---------- 1 file changed, 17 insertions(+), 10 deletions(-) diff --git a/tests/fbo/fbo-pbo-readpixels-small.c b/tests/fbo/fbo-pbo-readpixels-small.c index c7730b2..e088cf8 100644 --- a/tests/fbo/fbo-pbo-readpixels-small.c +++ b/tests/fbo/fbo-pbo-readpixels-small.c @@ -80,12 +80,16 @@ make_fbo(GLuint *fbo, GLuint *tex) } static GLboolean -probe(int x, int y, uint32_t expected, uint32_t observed) +probe(int x, int y, uint8_t *expected, uint32_t *observed) { - if ((expected & 0xffffff) != (observed & 0xffffff)) { + uint8_t *p_obs = (uint8_t *) observed; + + if (expected[0] != p_obs[0] || + expected[1] != p_obs[1] || + expected[2] != p_obs[2]) { printf("Probe color at (%i,%i)\n", x, y); - printf(" Expected: 0x%08x\n", expected); - printf(" Observed: 0x%08x\n", observed); + printf(" Expected: 0x%08x\n", *((uint32_t *) expected)); + printf(" Observed: 0x%08x\n", *observed); return GL_FALSE; } else { @@ -99,6 +103,8 @@ piglit_display(void) GLboolean pass = GL_TRUE; GLuint fbo, tex, pbo; uint32_t *addr; + static uint8_t green[] = {0x00, 0xFF, 0x00, 0x00}; + static uint8_t blue[] = {0xFF, 0x00, 0x00, 0x00}; make_fbo(&fbo, &tex); @@ -122,24 +128,25 @@ piglit_display(void) glReadPixels(0, 0, 2, 2, GL_BGRA, GL_UNSIGNED_BYTE, (void *)(uintptr_t)0); addr = glMapBufferARB(GL_PIXEL_PACK_BUFFER, GL_READ_ONLY_ARB); - pass &= probe(0, 0, 0x0000ff00, addr[0]); - pass &= probe(1, 0, 0x0000ff00, addr[1]); - pass &= probe(0, 1, 0x000000ff, addr[2]); - pass &= probe(1, 1, 0x000000ff, addr[3]); + + pass &= probe(0, 0, green, &addr[0]); + pass &= probe(1, 0, green, &addr[1]); + pass &= probe(0, 1, blue, &addr[2]); + pass &= probe(1, 1, blue, &addr[3]); glUnmapBufferARB(GL_PIXEL_PACK_BUFFER); /* Read with an offset. */ glReadPixels(1, 0, 1, 1, GL_BGRA, GL_UNSIGNED_BYTE, (void *)(uintptr_t)4); addr = glMapBufferARB(GL_PIXEL_PACK_BUFFER, GL_READ_ONLY_ARB); - pass &= probe(1, 0, 0x0000ff00, addr[1]); + pass &= probe(1, 0, green, &addr[1]); glUnmapBufferARB(GL_PIXEL_PACK_BUFFER); /* Read with an offset. */ glReadPixels(1, 1, 1, 1, GL_BGRA, GL_UNSIGNED_BYTE, (void *)(uintptr_t)4); addr = glMapBufferARB(GL_PIXEL_PACK_BUFFER, GL_READ_ONLY_ARB); - pass &= probe(1, 1, 0x000000ff, addr[1]); + pass &= probe(1, 1, blue, &addr[1]); glUnmapBufferARB(GL_PIXEL_PACK_BUFFER); glDeleteBuffersARB(1, &pbo); -- 2.5.5 _______________________________________________ Piglit mailing list [email protected] https://lists.freedesktop.org/mailman/listinfo/piglit
