diff options
| author | Eric Anholt <eric@anholt.net> | 2009-08-26 09:51:15 -0700 |
|---|---|---|
| committer | Eric Anholt <eric@anholt.net> | 2009-09-08 14:30:15 -0700 |
| commit | b4922b533155cc139ebafb111502bb55d2ad2ccf (patch) | |
| tree | a784133f9de7e5fccda5305ab926bebc5ffbaf19 /src/mesa/swrast/s_depth.c | |
| parent | 3e4539a471da48066a83eda8e14301dbc4dbf6db (diff) | |
mesa: Add support for ARB_depth_clamp.
This currently doesn't include fixing up the cliptests in the assembly
paths to support ARB_depth_clamp, so enabling depth_clamp forces the C path.
Diffstat (limited to 'src/mesa/swrast/s_depth.c')
| -rw-r--r-- | src/mesa/swrast/s_depth.c | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/src/mesa/swrast/s_depth.c b/src/mesa/swrast/s_depth.c index 26e23f02d5..1a428fb1a2 100644 --- a/src/mesa/swrast/s_depth.c +++ b/src/mesa/swrast/s_depth.c @@ -497,6 +497,33 @@ depth_test_span32( GLcontext *ctx, GLuint n, return passed; } +/* Apply ARB_depth_clamp to span of fragments. */ +void +_swrast_depth_clamp_span( GLcontext *ctx, SWspan *span ) +{ + struct gl_framebuffer *fb = ctx->DrawBuffer; + struct gl_renderbuffer *rb = fb->_DepthBuffer; + const GLuint count = span->end; + GLuint *zValues = span->array->z; + GLuint near, far; + int i; + + if (rb->DataType == GL_UNSIGNED_SHORT) { + near = FLOAT_TO_UINT(ctx->Viewport.Near); + far = FLOAT_TO_UINT(ctx->Viewport.Far); + } else { + assert(rb->DataType == GL_UNSIGNED_INT); + CLAMPED_FLOAT_TO_USHORT(near, ctx->Viewport.Near); + CLAMPED_FLOAT_TO_USHORT(far, ctx->Viewport.Far); + } + for (i = 0; i < count; i++) { + if (zValues[i] < near) + zValues[i] = near; + if (zValues[i] > far) + zValues[i] = far; + } +} + /* |