On 02/01/2012 02:38 PM, Ian Romanick wrote:
From: Ian Romanick<ian.d.roman...@intel.com>
This is a hack, and it will result in incorrect rendering. However,
it does eliminate spurious warnings in several piglit CopyPixels tests
that involve floating-point depth buffers.
The real solution is to add a zf field to SWspan to store float Z
values. When a float depth buffer is involved, swrast should also
populate the zf field. I'll consider this post-8.0 work.
Signed-off-by: Ian Romanick<ian.d.roman...@intel.com>
---
src/mesa/main/format_unpack.c | 32 ++++++++++++++++++++++++++++++++
1 files changed, 32 insertions(+), 0 deletions(-)
diff --git a/src/mesa/main/format_unpack.c b/src/mesa/main/format_unpack.c
index cd16a9e..b45dde2 100644
--- a/src/mesa/main/format_unpack.c
+++ b/src/mesa/main/format_unpack.c
@@ -2916,6 +2916,32 @@ unpack_uint_z_Z32(const void *src, GLuint *dst, GLuint n)
memcpy(dst, src, n * sizeof(GLuint));
}
+static void
+unpack_uint_z_Z32_FLOAT(const void *src, GLuint *dst, GLuint n)
+{
+ const float *s = ((const float *)src);
More parens than necessary there.
+ GLuint i;
+ for (i = 0; i< n; i++) {
+ dst[i] = FLOAT_TO_UINT(IROUND(CLAMP((s[i]), 0.0F, 1.0F)));
+ }
+}
+
+static void
+unpack_uint_z_Z32_FLOAT_X24S8(const void *src, GLuint *dst, GLuint n)
+{
+ struct z32f_x24s8 {
+ float z;
+ uint32_t x24s8;
+ };
+
+ const struct z32f_x24s8 *s = (const struct z32f_x24s8 *) src;
+ GLuint i;
+
+ for (i = 0; i< n; i++) {
+ dst[i] = FLOAT_TO_UINT(IROUND(CLAMP((s[i].z), 0.0F, 1.0F)));
+ }
+}
+
/**
* Unpack Z values.
@@ -2943,6 +2969,12 @@ _mesa_unpack_uint_z_row(gl_format format, GLuint n,
case MESA_FORMAT_Z32:
unpack = unpack_uint_z_Z32;
break;
+ case MESA_FORMAT_Z32_FLOAT:
+ unpack = unpack_uint_z_Z32_FLOAT;
+ break;
+ case MESA_FORMAT_Z32_FLOAT_X24S8:
+ unpack = unpack_uint_z_Z32_FLOAT_X24S8;
+ break;
default:
_mesa_problem(NULL, "bad format %s in _mesa_unpack_uint_z_row",
_mesa_get_format_name(format));
Reviewed-by: Brian Paul <bri...@vmware.com>
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