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Diffstat (limited to 'src/gallium/drivers/softpipe/sp_quad_depth_test.c')
-rw-r--r--src/gallium/drivers/softpipe/sp_quad_depth_test.c290
1 files changed, 290 insertions, 0 deletions
diff --git a/src/gallium/drivers/softpipe/sp_quad_depth_test.c b/src/gallium/drivers/softpipe/sp_quad_depth_test.c
new file mode 100644
index 0000000000..523bd3e080
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+++ b/src/gallium/drivers/softpipe/sp_quad_depth_test.c
@@ -0,0 +1,290 @@
+/**************************************************************************
+ *
+ * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
+ * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
+ * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ **************************************************************************/
+
+/**
+ * \brief Quad depth testing
+ */
+
+#include "pipe/p_defines.h"
+#include "util/u_memory.h"
+#include "sp_context.h"
+#include "sp_headers.h"
+#include "sp_surface.h"
+#include "sp_quad.h"
+#include "sp_tile_cache.h"
+
+
+/**
+ * Do depth testing for a quad.
+ * Not static since it's used by the stencil code.
+ */
+
+/*
+ * To increase efficiency, we should probably have multiple versions
+ * of this function that are specifically for Z16, Z32 and FP Z buffers.
+ * Try to effectively do that with codegen...
+ */
+
+void
+sp_depth_test_quad(struct quad_stage *qs, struct quad_header *quad)
+{
+ struct softpipe_context *softpipe = qs->softpipe;
+ struct pipe_surface *ps = softpipe->framebuffer.zsbuf;
+ const enum pipe_format format = ps->format;
+ unsigned bzzzz[QUAD_SIZE]; /**< Z values fetched from depth buffer */
+ unsigned qzzzz[QUAD_SIZE]; /**< Z values from the quad */
+ unsigned zmask = 0;
+ unsigned j;
+ struct softpipe_cached_tile *tile
+ = sp_get_cached_tile(softpipe, softpipe->zsbuf_cache, quad->input.x0, quad->input.y0);
+
+ assert(ps); /* shouldn't get here if there's no zbuffer */
+
+ /*
+ * Convert quad's float depth values to int depth values (qzzzz).
+ * If the Z buffer stores integer values, we _have_ to do the depth
+ * compares with integers (not floats). Otherwise, the float->int->float
+ * conversion of Z values (which isn't an identity function) will cause
+ * Z-fighting errors.
+ *
+ * Also, get the zbuffer values (bzzzz) from the cached tile.
+ */
+ switch (format) {
+ case PIPE_FORMAT_Z16_UNORM:
+ {
+ float scale = 65535.0;
+
+ for (j = 0; j < QUAD_SIZE; j++) {
+ qzzzz[j] = (unsigned) (quad->output.depth[j] * scale);
+ }
+
+ for (j = 0; j < QUAD_SIZE; j++) {
+ int x = quad->input.x0 % TILE_SIZE + (j & 1);
+ int y = quad->input.y0 % TILE_SIZE + (j >> 1);
+ bzzzz[j] = tile->data.depth16[y][x];
+ }
+ }
+ break;
+ case PIPE_FORMAT_Z32_UNORM:
+ {
+ double scale = (double) (uint) ~0UL;
+
+ for (j = 0; j < QUAD_SIZE; j++) {
+ qzzzz[j] = (unsigned) (quad->output.depth[j] * scale);
+ }
+
+ for (j = 0; j < QUAD_SIZE; j++) {
+ int x = quad->input.x0 % TILE_SIZE + (j & 1);
+ int y = quad->input.y0 % TILE_SIZE + (j >> 1);
+ bzzzz[j] = tile->data.depth32[y][x];
+ }
+ }
+ break;
+ case PIPE_FORMAT_X8Z24_UNORM:
+ /* fall-through */
+ case PIPE_FORMAT_S8Z24_UNORM:
+ {
+ float scale = (float) ((1 << 24) - 1);
+
+ for (j = 0; j < QUAD_SIZE; j++) {
+ qzzzz[j] = (unsigned) (quad->output.depth[j] * scale);
+ }
+
+ for (j = 0; j < QUAD_SIZE; j++) {
+ int x = quad->input.x0 % TILE_SIZE + (j & 1);
+ int y = quad->input.y0 % TILE_SIZE + (j >> 1);
+ bzzzz[j] = tile->data.depth32[y][x] & 0xffffff;
+ }
+ }
+ break;
+ case PIPE_FORMAT_Z24X8_UNORM:
+ /* fall-through */
+ case PIPE_FORMAT_Z24S8_UNORM:
+ {
+ float scale = (float) ((1 << 24) - 1);
+
+ for (j = 0; j < QUAD_SIZE; j++) {
+ qzzzz[j] = (unsigned) (quad->output.depth[j] * scale);
+ }
+
+ for (j = 0; j < QUAD_SIZE; j++) {
+ int x = quad->input.x0 % TILE_SIZE + (j & 1);
+ int y = quad->input.y0 % TILE_SIZE + (j >> 1);
+ bzzzz[j] = tile->data.depth32[y][x] >> 8;
+ }
+ }
+ break;
+ default:
+ assert(0);
+ }
+
+ switch (softpipe->depth_stencil->depth.func) {
+ case PIPE_FUNC_NEVER:
+ /* zmask = 0 */
+ break;
+ case PIPE_FUNC_LESS:
+ /* Note this is pretty much a single sse or cell instruction.
+ * Like this: quad->mask &= (quad->outputs.depth < zzzz);
+ */
+ for (j = 0; j < QUAD_SIZE; j++) {
+ if (qzzzz[j] < bzzzz[j])
+ zmask |= 1 << j;
+ }
+ break;
+ case PIPE_FUNC_EQUAL:
+ for (j = 0; j < QUAD_SIZE; j++) {
+ if (qzzzz[j] == bzzzz[j])
+ zmask |= 1 << j;
+ }
+ break;
+ case PIPE_FUNC_LEQUAL:
+ for (j = 0; j < QUAD_SIZE; j++) {
+ if (qzzzz[j] <= bzzzz[j])
+ zmask |= (1 << j);
+ }
+ break;
+ case PIPE_FUNC_GREATER:
+ for (j = 0; j < QUAD_SIZE; j++) {
+ if (qzzzz[j] > bzzzz[j])
+ zmask |= (1 << j);
+ }
+ break;
+ case PIPE_FUNC_NOTEQUAL:
+ for (j = 0; j < QUAD_SIZE; j++) {
+ if (qzzzz[j] != bzzzz[j])
+ zmask |= (1 << j);
+ }
+ break;
+ case PIPE_FUNC_GEQUAL:
+ for (j = 0; j < QUAD_SIZE; j++) {
+ if (qzzzz[j] >= bzzzz[j])
+ zmask |= (1 << j);
+ }
+ break;
+ case PIPE_FUNC_ALWAYS:
+ zmask = MASK_ALL;
+ break;
+ default:
+ assert(0);
+ }
+
+ quad->inout.mask &= zmask;
+
+ if (softpipe->depth_stencil->depth.writemask) {
+
+ /* This is also efficient with sse / spe instructions:
+ */
+ for (j = 0; j < QUAD_SIZE; j++) {
+ if (quad->inout.mask & (1 << j)) {
+ bzzzz[j] = qzzzz[j];
+ }
+ }
+
+ /* put updated Z values back into cached tile */
+ switch (format) {
+ case PIPE_FORMAT_Z16_UNORM:
+ for (j = 0; j < QUAD_SIZE; j++) {
+ int x = quad->input.x0 % TILE_SIZE + (j & 1);
+ int y = quad->input.y0 % TILE_SIZE + (j >> 1);
+ tile->data.depth16[y][x] = (ushort) bzzzz[j];
+ }
+ break;
+ case PIPE_FORMAT_X8Z24_UNORM:
+ /* fall-through */
+ /* (yes, this falls through to a different case than above) */
+ case PIPE_FORMAT_Z32_UNORM:
+ for (j = 0; j < QUAD_SIZE; j++) {
+ int x = quad->input.x0 % TILE_SIZE + (j & 1);
+ int y = quad->input.y0 % TILE_SIZE + (j >> 1);
+ tile->data.depth32[y][x] = bzzzz[j];
+ }
+ break;
+ case PIPE_FORMAT_S8Z24_UNORM:
+ for (j = 0; j < QUAD_SIZE; j++) {
+ int x = quad->input.x0 % TILE_SIZE + (j & 1);
+ int y = quad->input.y0 % TILE_SIZE + (j >> 1);
+ uint s8z24 = tile->data.depth32[y][x];
+ s8z24 = (s8z24 & 0xff000000) | bzzzz[j];
+ tile->data.depth32[y][x] = s8z24;
+ }
+ break;
+ case PIPE_FORMAT_Z24S8_UNORM:
+ for (j = 0; j < QUAD_SIZE; j++) {
+ int x = quad->input.x0 % TILE_SIZE + (j & 1);
+ int y = quad->input.y0 % TILE_SIZE + (j >> 1);
+ uint z24s8 = tile->data.depth32[y][x];
+ z24s8 = (z24s8 & 0xff) | (bzzzz[j] << 8);
+ tile->data.depth32[y][x] = z24s8;
+ }
+ break;
+ case PIPE_FORMAT_Z24X8_UNORM:
+ for (j = 0; j < QUAD_SIZE; j++) {
+ int x = quad->input.x0 % TILE_SIZE + (j & 1);
+ int y = quad->input.y0 % TILE_SIZE + (j >> 1);
+ tile->data.depth32[y][x] = bzzzz[j] << 8;
+ }
+ break;
+ default:
+ assert(0);
+ }
+ }
+}
+
+
+static void
+depth_test_quad(struct quad_stage *qs, struct quad_header *quad)
+{
+ sp_depth_test_quad(qs, quad);
+
+ if (quad->inout.mask)
+ qs->next->run(qs->next, quad);
+}
+
+
+static void depth_test_begin(struct quad_stage *qs)
+{
+ qs->next->begin(qs->next);
+}
+
+
+static void depth_test_destroy(struct quad_stage *qs)
+{
+ FREE( qs );
+}
+
+
+struct quad_stage *sp_quad_depth_test_stage( struct softpipe_context *softpipe )
+{
+ struct quad_stage *stage = CALLOC_STRUCT(quad_stage);
+
+ stage->softpipe = softpipe;
+ stage->begin = depth_test_begin;
+ stage->run = depth_test_quad;
+ stage->destroy = depth_test_destroy;
+
+ return stage;
+}
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