diff options
Diffstat (limited to 'src/mesa/swrast/s_texture.c')
| -rw-r--r-- | src/mesa/swrast/s_texture.c | 28 |
1 files changed, 27 insertions, 1 deletions
diff --git a/src/mesa/swrast/s_texture.c b/src/mesa/swrast/s_texture.c index 24402259233..e1e1d0f0ceb 100644 --- a/src/mesa/swrast/s_texture.c +++ b/src/mesa/swrast/s_texture.c @@ -1,4 +1,4 @@ -/* $Id: s_texture.c,v 1.41 2001/10/17 23:03:34 brianp Exp $ */ +/* $Id: s_texture.c,v 1.42 2001/11/19 01:18:28 brianp Exp $ */ /* * Mesa 3-D graphics library @@ -956,6 +956,28 @@ opt_sample_rgba_2d( GLcontext *ctx, GLuint texUnit, } } +#ifdef DEBUG +static int +span_is_monotonous (GLuint n, const GLfloat lambda[]) +{ + GLuint i; + + if (n <= 1) /* array too short */ + return GL_TRUE; + else if (lambda[0] >= lambda[n-1]) { /* decreasing */ + for (i=0; i<n-1; i++) + if (lambda[i] < lambda[i+1]) + return GL_FALSE; + } + else { /* increasing */ + for (i=0; i<n-1; i++) + if (lambda[i] > lambda[i+1]) + return GL_FALSE; + } + + return GL_TRUE; +} +#endif /* DEBUG */ /* * Given an array of (s,t) texture coordinate and lambda (level of detail) @@ -973,6 +995,10 @@ sample_lambda_2d( GLcontext *ctx, GLuint texUnit, GLuint i; (void) u; +#ifdef DEBUG + ASSERT (span_is_monotonous(n, lambda) == GL_TRUE); +#endif /* DEBUG */ + /* since lambda is monotonous-array use this check first */ if (lambda[0] <= minMagThresh && lambda[n-1] <= minMagThresh) { /* magnification for whole span */ |