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Diffstat (limited to 'src/gallium/auxiliary/draw/draw_pt_post_vs.c')
-rw-r--r--src/gallium/auxiliary/draw/draw_pt_post_vs.c233
1 files changed, 233 insertions, 0 deletions
diff --git a/src/gallium/auxiliary/draw/draw_pt_post_vs.c b/src/gallium/auxiliary/draw/draw_pt_post_vs.c
new file mode 100644
index 0000000000..96dc706b99
--- /dev/null
+++ b/src/gallium/auxiliary/draw/draw_pt_post_vs.c
@@ -0,0 +1,233 @@
+/**************************************************************************
+ *
+ * Copyright 2008 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.
+ *
+ **************************************************************************/
+
+#include "util/u_memory.h"
+#include "pipe/p_context.h"
+#include "draw/draw_context.h"
+#include "draw/draw_private.h"
+#include "draw/draw_vbuf.h"
+#include "draw/draw_vertex.h"
+#include "draw/draw_pt.h"
+
+struct pt_post_vs {
+ struct draw_context *draw;
+
+ boolean (*run)( struct pt_post_vs *pvs,
+ struct vertex_header *vertices,
+ unsigned count,
+ unsigned stride );
+};
+
+
+
+static INLINE float
+dot4(const float *a, const float *b)
+{
+ return (a[0]*b[0] +
+ a[1]*b[1] +
+ a[2]*b[2] +
+ a[3]*b[3]);
+}
+
+
+
+static INLINE unsigned
+compute_clipmask_gl(const float *clip, /*const*/ float plane[][4], unsigned nr)
+{
+ unsigned mask = 0x0;
+ unsigned i;
+
+#if 0
+ debug_printf("compute clipmask %f %f %f %f\n",
+ clip[0], clip[1], clip[2], clip[3]);
+ assert(clip[3] != 0.0);
+#endif
+
+ /* Do the hardwired planes first:
+ */
+ if (-clip[0] + clip[3] < 0) mask |= (1<<0);
+ if ( clip[0] + clip[3] < 0) mask |= (1<<1);
+ if (-clip[1] + clip[3] < 0) mask |= (1<<2);
+ if ( clip[1] + clip[3] < 0) mask |= (1<<3);
+ if ( clip[2] + clip[3] < 0) mask |= (1<<4); /* match mesa clipplane numbering - for now */
+ if (-clip[2] + clip[3] < 0) mask |= (1<<5); /* match mesa clipplane numbering - for now */
+
+ /* Followed by any remaining ones:
+ */
+ for (i = 6; i < nr; i++) {
+ if (dot4(clip, plane[i]) < 0)
+ mask |= (1<<i);
+ }
+
+ return mask;
+}
+
+
+/* The normal case - cliptest, rhw divide, viewport transform.
+ *
+ * Also handle identity viewport here at the expense of a few wasted
+ * instructions
+ */
+static boolean post_vs_cliptest_viewport_gl( struct pt_post_vs *pvs,
+ struct vertex_header *vertices,
+ unsigned count,
+ unsigned stride )
+{
+ struct vertex_header *out = vertices;
+ const float *scale = pvs->draw->viewport.scale;
+ const float *trans = pvs->draw->viewport.translate;
+ const unsigned pos = pvs->draw->vs.position_output;
+ unsigned clipped = 0;
+ unsigned j;
+
+ if (0) debug_printf("%s\n");
+
+ for (j = 0; j < count; j++) {
+ float *position = out->data[pos];
+
+ out->clip[0] = position[0];
+ out->clip[1] = position[1];
+ out->clip[2] = position[2];
+ out->clip[3] = position[3];
+
+ out->vertex_id = 0xffff;
+ out->clipmask = compute_clipmask_gl(out->clip,
+ pvs->draw->plane,
+ pvs->draw->nr_planes);
+ clipped += out->clipmask;
+
+ if (out->clipmask == 0)
+ {
+ /* divide by w */
+ float w = 1.0f / position[3];
+
+ /* Viewport mapping */
+ position[0] = position[0] * w * scale[0] + trans[0];
+ position[1] = position[1] * w * scale[1] + trans[1];
+ position[2] = position[2] * w * scale[2] + trans[2];
+ position[3] = w;
+#if 0
+ debug_printf("post viewport: %f %f %f %f\n",
+ position[0],
+ position[1],
+ position[2],
+ position[3]);
+#endif
+ }
+
+ out = (struct vertex_header *)( (char *)out + stride );
+ }
+
+ return clipped != 0;
+}
+
+
+
+/* If bypass_clipping is set, skip cliptest and rhw divide.
+ */
+static boolean post_vs_viewport( struct pt_post_vs *pvs,
+ struct vertex_header *vertices,
+ unsigned count,
+ unsigned stride )
+{
+ struct vertex_header *out = vertices;
+ const float *scale = pvs->draw->viewport.scale;
+ const float *trans = pvs->draw->viewport.translate;
+ const unsigned pos = pvs->draw->vs.position_output;
+ unsigned j;
+
+ if (0) debug_printf("%s\n", __FUNCTION__);
+ for (j = 0; j < count; j++) {
+ float *position = out->data[pos];
+
+ /* Viewport mapping only, no cliptest/rhw divide
+ */
+ position[0] = position[0] * scale[0] + trans[0];
+ position[1] = position[1] * scale[1] + trans[1];
+ position[2] = position[2] * scale[2] + trans[2];
+
+ out = (struct vertex_header *)((char *)out + stride);
+ }
+
+ return FALSE;
+}
+
+
+/* If bypass_clipping is set and we have an identity viewport, nothing
+ * to do.
+ */
+static boolean post_vs_none( struct pt_post_vs *pvs,
+ struct vertex_header *vertices,
+ unsigned count,
+ unsigned stride )
+{
+ if (0) debug_printf("%s\n", __FUNCTION__);
+ return FALSE;
+}
+
+boolean draw_pt_post_vs_run( struct pt_post_vs *pvs,
+ struct vertex_header *pipeline_verts,
+ unsigned count,
+ unsigned stride )
+{
+ return pvs->run( pvs, pipeline_verts, count, stride );
+}
+
+
+void draw_pt_post_vs_prepare( struct pt_post_vs *pvs,
+ boolean bypass_clipping,
+ boolean identity_viewport,
+ boolean opengl )
+{
+ if (bypass_clipping) {
+ if (identity_viewport)
+ pvs->run = post_vs_none;
+ else
+ pvs->run = post_vs_viewport;
+ }
+ else {
+ //if (opengl)
+ pvs->run = post_vs_cliptest_viewport_gl;
+ }
+}
+
+
+struct pt_post_vs *draw_pt_post_vs_create( struct draw_context *draw )
+{
+ struct pt_post_vs *pvs = CALLOC_STRUCT( pt_post_vs );
+ if (!pvs)
+ return NULL;
+
+ pvs->draw = draw;
+
+ return pvs;
+}
+
+void draw_pt_post_vs_destroy( struct pt_post_vs *pvs )
+{
+ FREE(pvs);
+}
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