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intel: Define span functions for S8 renderbuffers

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Since the stencil buffer is interleaved, the generic Mesa renderbuffer
accessors do not suffice. Custom span functions are necessary.

Acked-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Chad Versace <chad@chad-versace.us>
This commit is contained in:
Chad Versace
2011-06-01 11:31:56 -07:00
parent 2abc8cae87
commit ff99103c0a
1 changed files with 64 additions and 0 deletions
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64
src/mesa/drivers/dri/intel/intel_span.c
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@@ -1,6 +1,7 @@
/**************************************************************************
*
* Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
* Copyright 2011 Intel Corporation
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
@@ -23,9 +24,13 @@
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
* Authors:
* Chad Versace <chad@chad-versace.us>
*
**************************************************************************/
#include <stdbool.h>
#include <stdint.h>
#include "main/glheader.h"
#include "main/macros.h"
#include "main/mtypes.h"
@@ -112,6 +117,64 @@ intel_set_span_functions(struct intel_context *intel,
#define TAG2(x,y) intel_##x##y##_A8
#include "spantmp2.h"
/* ------------------------------------------------------------------------- */
/* s8 stencil span and pixel functions */
/* ------------------------------------------------------------------------- */
/*
* HAVE_HW_STENCIL_SPANS determines if stencil buffer read/writes are done with
* memcpy or for loops. Since the stencil buffer is interleaved, memcpy won't
* work.
*/
#define HAVE_HW_STENCIL_SPANS 0
#define LOCAL_STENCIL_VARS \
(void) ctx; \
int minx = 0; \
int miny = 0; \
int maxx = rb->Width; \
int maxy = rb->Height; \
int stride = rb->RowStride; \
uint8_t *buf = rb->Data; \
/* Don't flip y. */
#undef Y_FLIP
#define Y_FLIP(y) y
/**
* \brief Get pointer offset into stencil buffer.
*
* The stencil buffer interleaves two rows into one. Yay for crazy hardware.
* The table below demonstrates how the pointer arithmetic behaves for a buffer
* with positive stride (s=stride).
*
* x | y | byte offset
* --------------------------
* 0 | 0 | 0
* 0 | 0 | 1
* 1 | 0 | 2
* 1 | 1 | 3
* ... | ... | ...
* 0 | 2 | s
* 0 | 3 | s + 1
* 1 | 2 | s + 2
* 1 | 3 | s + 3
*
*
*/
static inline intptr_t
intel_offset_S8(int stride, GLint x, GLint y)
{
return 2 * ((y / 2) * stride + x) + y % 2;
}
#define WRITE_STENCIL(x, y, src) buf[intel_offset_S8(stride, x, y)] = src;
#define READ_STENCIL(dest, x, y) dest = buf[intel_offset_S8(stride, x, y)]
#define TAG(x) intel_##x##_S8
#include "stenciltmp.h"
/* ------------------------------------------------------------------------- */
void
intel_renderbuffer_map(struct intel_context *intel, struct gl_renderbuffer *rb)
{
@@ -332,6 +395,7 @@ static span_init_func intel_span_init_funcs[MESA_FORMAT_COUNT] =
[MESA_FORMAT_Z16] = _mesa_set_renderbuffer_accessors,
[MESA_FORMAT_X8_Z24] = _mesa_set_renderbuffer_accessors,
[MESA_FORMAT_S8_Z24] = _mesa_set_renderbuffer_accessors,
[MESA_FORMAT_S8] = intel_InitStencilPointers_S8,
[MESA_FORMAT_R8] = _mesa_set_renderbuffer_accessors,
[MESA_FORMAT_RG88] = _mesa_set_renderbuffer_accessors,
[MESA_FORMAT_R16] = _mesa_set_renderbuffer_accessors,