From: Marek Olšák <[email protected]>
zMin and zMax can't use _DepthMaxF, because the test is done in Z32_UNORM.
Probably a useless patch given how popular swrast is nowadays, but it helped
create and validate the piglit test.
---
src/mesa/swrast/s_depth.c | 14 ++++++++++++--
1 file changed, 12 insertions(+), 2 deletions(-)
diff --git a/src/mesa/swrast/s_depth.c b/src/mesa/swrast/s_depth.c
index 134f897..0a03541 100644
--- a/src/mesa/swrast/s_depth.c
+++ b/src/mesa/swrast/s_depth.c
@@ -419,8 +419,8 @@ _swrast_depth_bounds_test( struct gl_context *ctx, SWspan
*span )
struct gl_framebuffer *fb = ctx->DrawBuffer;
struct gl_renderbuffer *rb = fb->Attachment[BUFFER_DEPTH].Renderbuffer;
GLubyte *zStart;
- GLuint zMin = (GLuint) (ctx->Depth.BoundsMin * fb->_DepthMaxF + 0.5F);
- GLuint zMax = (GLuint) (ctx->Depth.BoundsMax * fb->_DepthMaxF + 0.5F);
+ GLuint zMin = (double)ctx->Depth.BoundsMin * 0xffffffff;
+ GLuint zMax = (double)ctx->Depth.BoundsMax * 0xffffffff;
GLubyte *mask = span->array->mask;
const GLuint count = span->end;
GLuint i;
@@ -444,6 +444,16 @@ _swrast_depth_bounds_test( struct gl_context *ctx, SWspan
*span )
zBufferVals = (const GLuint *) zStart;
}
else {
+ /* Round the bounds to the precision of the zbuffer. */
+ if (rb->Format == MESA_FORMAT_Z_UNORM16) {
+ zMin = (zMin & 0xffff0000) | (zMin >> 16);
+ zMax = (zMax & 0xffff0000) | (zMax >> 16);
+ } else {
+ /* 24 bits */
+ zMin = (zMin & 0xffffff00) | (zMin >> 24);
+ zMax = (zMax & 0xffffff00) | (zMax >> 24);
+ }
+
/* unpack Z values into a temporary array */
if (span->arrayMask & SPAN_XY) {
get_z32_values(ctx, rb, count, span->array->x, span->array->y,
--
2.1.4
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