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Diffstat (limited to 'src/mesa/pipe/softpipe/sp_z_surface.c')
-rw-r--r--src/mesa/pipe/softpipe/sp_z_surface.c241
1 files changed, 241 insertions, 0 deletions
diff --git a/src/mesa/pipe/softpipe/sp_z_surface.c b/src/mesa/pipe/softpipe/sp_z_surface.c
new file mode 100644
index 0000000000..744737cb6c
--- /dev/null
+++ b/src/mesa/pipe/softpipe/sp_z_surface.c
@@ -0,0 +1,241 @@
+/**************************************************************************
+ *
+ * Copyright 2003 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.
+ *
+ **************************************************************************/
+
+
+/**
+ * Software Z buffer/surface.
+ *
+ * \author Brian Paul
+ */
+
+
+#include "main/imports.h"
+#include "pipe/p_state.h"
+#include "pipe/p_defines.h"
+#include "sp_context.h"
+#include "sp_surface.h"
+#include "sp_z_surface.h"
+
+static void*
+z_map(struct pipe_buffer *pb, GLuint access_mode)
+{
+ struct softpipe_surface *sps = (struct softpipe_surface *) pb;
+ sps->surface.ptr = pb->ptr;
+ sps->surface.stride = sps->surface.width;
+ return pb->ptr;
+}
+
+static void
+z_unmap(struct pipe_buffer *pb)
+{
+ struct softpipe_surface *sps = (struct softpipe_surface *) pb;
+ sps->surface.ptr = NULL;
+ sps->surface.stride = 0;
+}
+
+static void
+z_resize(struct pipe_surface *ps, GLuint width, GLuint height)
+{
+ struct softpipe_surface *sps = (struct softpipe_surface *) ps;
+
+ if (sps->surface.buffer.ptr)
+ free(sps->surface.buffer.ptr);
+
+ sps->surface.stride = sps->surface.width;
+ if (sps->surface.format == PIPE_FORMAT_U_Z16)
+ sps->surface.cpp = 2;
+ else if (sps->surface.format == PIPE_FORMAT_U_Z32 ||
+ sps->surface.format == PIPE_FORMAT_Z24_S8)
+ sps->surface.cpp = 4;
+ else
+ assert(0);
+
+ ps->buffer.ptr = (GLubyte *) malloc(width * height * sps->surface.cpp);
+ ps->width = width;
+ ps->height = height;
+
+}
+
+static void
+z16_read_quad_z(struct softpipe_surface *sps,
+ GLint x, GLint y, GLuint zzzz[QUAD_SIZE])
+{
+ const GLushort *src
+ = (GLushort *) sps->surface.ptr + y * sps->surface.stride + x;
+
+ assert(sps->surface.format == PIPE_FORMAT_U_Z16);
+
+ /* converting GLushort to GLuint: */
+ zzzz[0] = src[0];
+ zzzz[1] = src[1];
+ zzzz[2] = src[sps->surface.width + 0];
+ zzzz[3] = src[sps->surface.width + 1];
+}
+
+static void
+z16_write_quad_z(struct softpipe_surface *sps,
+ GLint x, GLint y, const GLuint zzzz[QUAD_SIZE])
+{
+ GLushort *dst = (GLushort *) sps->surface.ptr + y * sps->surface.stride + x;
+
+ assert(sps->surface.format == PIPE_FORMAT_U_Z16);
+
+ /* converting GLuint to GLushort: */
+ dst[0] = zzzz[0];
+ dst[1] = zzzz[1];
+ dst[sps->surface.width + 0] = zzzz[2];
+ dst[sps->surface.width + 1] = zzzz[3];
+}
+
+static void
+z32_read_quad_z(struct softpipe_surface *sps,
+ GLint x, GLint y, GLuint zzzz[QUAD_SIZE])
+{
+ const GLuint *src
+ = (GLuint *) sps->surface.ptr + y * sps->surface.stride + x;
+
+ assert(sps->surface.format == PIPE_FORMAT_U_Z32);
+
+ zzzz[0] = src[0];
+ zzzz[1] = src[1];
+ zzzz[2] = src[sps->surface.width + 0];
+ zzzz[3] = src[sps->surface.width + 1];
+}
+
+static void
+z32_write_quad_z(struct softpipe_surface *sps,
+ GLint x, GLint y, const GLuint zzzz[QUAD_SIZE])
+{
+ GLuint *dst = (GLuint *) sps->surface.ptr + y * sps->surface.stride + x;
+
+ assert(sps->surface.format == PIPE_FORMAT_U_Z32);
+
+ dst[0] = zzzz[0];
+ dst[1] = zzzz[1];
+ dst[sps->surface.width + 0] = zzzz[2];
+ dst[sps->surface.width + 1] = zzzz[3];
+}
+
+static void
+z24s8_read_quad_z(struct softpipe_surface *sps,
+ GLint x, GLint y, GLuint zzzz[QUAD_SIZE])
+{
+ const GLuint *src
+ = (GLuint *) sps->surface.ptr + y * sps->surface.stride + x;
+
+ assert(sps->surface.format == PIPE_FORMAT_Z24_S8);
+
+ zzzz[0] = src[0] >> 8;
+ zzzz[1] = src[1] >> 8;
+ zzzz[2] = src[sps->surface.width + 0] >> 8;
+ zzzz[3] = src[sps->surface.width + 1] >> 8;
+}
+
+static void
+z24s8_write_quad_z(struct softpipe_surface *sps,
+ GLint x, GLint y, const GLuint zzzz[QUAD_SIZE])
+{
+ GLuint *dst = (GLuint *) sps->surface.ptr + y * sps->surface.stride + x;
+
+ assert(sps->surface.format == PIPE_FORMAT_Z24_S8);
+ assert(zzzz[0] <= 0xffffff);
+
+ dst[0] = (dst[0] & 0xff) | (zzzz[0] << 8);
+ dst[1] = (dst[1] & 0xff) | (zzzz[1] << 8);
+ dst += sps->surface.width;
+ dst[0] = (dst[0] & 0xff) | (zzzz[2] << 8);
+ dst[1] = (dst[1] & 0xff) | (zzzz[3] << 8);
+}
+
+static void
+z24s8_read_quad_stencil(struct softpipe_surface *sps,
+ GLint x, GLint y, GLubyte ssss[QUAD_SIZE])
+{
+ const GLuint *src
+ = (GLuint *) sps->surface.ptr + y * sps->surface.stride + x;
+
+ assert(sps->surface.format == PIPE_FORMAT_Z24_S8);
+
+ ssss[0] = src[0] & 0xff;
+ ssss[1] = src[1] & 0xff;
+ ssss[2] = src[sps->surface.width + 0] & 0xff;
+ ssss[3] = src[sps->surface.width + 1] & 0xff;
+}
+
+static void
+z24s8_write_quad_stencil(struct softpipe_surface *sps,
+ GLint x, GLint y, const GLubyte ssss[QUAD_SIZE])
+{
+ GLuint *dst = (GLuint *) sps->surface.ptr + y * sps->surface.stride + x;
+
+ assert(sps->surface.format == PIPE_FORMAT_Z24_S8);
+
+ dst[0] = (dst[0] & 0xffffff00) | ssss[0];
+ dst[1] = (dst[1] & 0xffffff00) | ssss[1];
+ dst += sps->surface.width;
+ dst[0] = (dst[0] & 0xffffff00) | ssss[2];
+ dst[1] = (dst[1] & 0xffffff00) | ssss[3];
+}
+
+
+
+/**
+ * Create a new software-based Z buffer.
+ * \param format one of the PIPE_FORMAT_z* formats
+ */
+struct softpipe_surface *
+softpipe_new_z_surface(GLuint format)
+{
+ struct softpipe_surface *sps = CALLOC_STRUCT(softpipe_surface);
+ if (!sps)
+ return NULL;
+
+ sps->surface.format = format;
+ sps->surface.resize = z_resize;
+ sps->surface.buffer.map = z_map;
+ sps->surface.buffer.unmap = z_unmap;
+
+ if (format == PIPE_FORMAT_U_Z16) {
+ sps->read_quad_z = z16_read_quad_z;
+ sps->write_quad_z = z16_write_quad_z;
+ }
+ else if (format == PIPE_FORMAT_U_Z32) {
+ sps->read_quad_z = z32_read_quad_z;
+ sps->write_quad_z = z32_write_quad_z;
+ }
+ else if (format == PIPE_FORMAT_Z24_S8) {
+ sps->read_quad_z = z24s8_read_quad_z;
+ sps->write_quad_z = z24s8_write_quad_z;
+ sps->read_quad_stencil = z24s8_read_quad_stencil;
+ sps->write_quad_stencil = z24s8_write_quad_stencil;
+ }
+ else {
+ assert(0);
+ }
+
+ return sps;
+}
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