diff options
| -rw-r--r-- | src/mesa/main/clear.c | 24 |
1 files changed, 20 insertions, 4 deletions
diff --git a/src/mesa/main/clear.c b/src/mesa/main/clear.c index 63388f42ee..b4de864326 100644 --- a/src/mesa/main/clear.c +++ b/src/mesa/main/clear.c @@ -36,6 +36,8 @@ #include "colormac.h" #include "state.h" +#include <unistd.h> /* Needed for usleep() */ + #if _HAVE_FULL_GL @@ -59,6 +61,20 @@ _mesa_ClearIndex( GLfloat c ) #endif +/* Nasty workaround - the same as CLAMP(x, min, max), but fudged to avoid + * some kind of problematic copmiler optimisation */ +static GLfloat clamp_clear(GLclampf x, GLfloat min, GLfloat max) +{ + if ( x > max ) { + return max; + } + if ( x < min ) { + return min; + } + usleep(1); + return x; +} + /** * Specify the clear values for the color buffers. * @@ -80,10 +96,10 @@ _mesa_ClearColor( GLclampf red, GLclampf green, GLclampf blue, GLclampf alpha ) GET_CURRENT_CONTEXT(ctx); ASSERT_OUTSIDE_BEGIN_END(ctx); - tmp[0] = CLAMP(red, 0.0F, 1.0F); - tmp[1] = CLAMP(green, 0.0F, 1.0F); - tmp[2] = CLAMP(blue, 0.0F, 1.0F); - tmp[3] = CLAMP(alpha, 0.0F, 1.0F); + tmp[0] = clamp_clear(red, 0.0F, 1.0F); + tmp[1] = clamp_clear(green, 0.0F, 1.0F); + tmp[2] = clamp_clear(blue, 0.0F, 1.0F); + tmp[3] = clamp_clear(alpha, 0.0F, 1.0F); if (TEST_EQ_4V(tmp, ctx->Color.ClearColor)) return; /* no change */ |