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authorBrian <brian.paul@tungstengraphics.com>2007-07-09 16:12:13 -0600
committerBrian <brian.paul@tungstengraphics.com>2007-07-09 16:12:13 -0600
commit9fbdf500788e78d63247a17226a75f7a079ae315 (patch)
tree322a4f6dce835f1da94d830d9e5c5789885c716b
parent10f4b37bd70c12c8caaa85ff5b94aec532788abd (diff)
New 'draw' module for handling the various stages of primitive drawing (clipping, culling, etc).
-rw-r--r--src/mesa/pipe/draw/draw_context.c182
1 files changed, 182 insertions, 0 deletions
diff --git a/src/mesa/pipe/draw/draw_context.c b/src/mesa/pipe/draw/draw_context.c
new file mode 100644
index 0000000000..c91be23eef
--- /dev/null
+++ b/src/mesa/pipe/draw/draw_context.c
@@ -0,0 +1,182 @@
+/**************************************************************************
+ *
+ * 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.
+ *
+ **************************************************************************/
+
+ /*
+ * Authors:
+ * Keith Whitwell <keith@tungstengraphics.com>
+ */
+
+#include "imports.h"
+#include "macros.h"
+
+#include "draw_context.h"
+#include "draw_private.h"
+
+
+struct draw_context *draw_create( void )
+{
+ struct draw_context *draw = CALLOC_STRUCT( draw_context );
+
+ /* create pipeline stages */
+ draw->pipeline.unfilled = prim_unfilled( draw );
+ draw->pipeline.twoside = prim_twoside( draw );
+ draw->pipeline.offset = prim_offset( draw );
+ draw->pipeline.clip = prim_clip( draw );
+ draw->pipeline.flatshade = prim_flatshade( draw );
+ draw->pipeline.cull = prim_cull( draw );
+
+ ASSIGN_4V( draw->plane[0], -1, 0, 0, 1 );
+ ASSIGN_4V( draw->plane[1], 1, 0, 0, 1 );
+ ASSIGN_4V( draw->plane[2], 0, -1, 0, 1 );
+ ASSIGN_4V( draw->plane[3], 0, 1, 0, 1 );
+ ASSIGN_4V( draw->plane[4], 0, 0, 1, 1 ); /* yes these are correct */
+ ASSIGN_4V( draw->plane[5], 0, 0, -1, 1 ); /* mesa's a bit wonky */
+ draw->nr_planes = 6;
+
+ draw->vf = vf_create( GL_TRUE );
+
+ return draw;
+}
+
+
+void draw_destroy( struct draw_context *draw )
+{
+ if (draw->header.storage)
+ ALIGN_FREE( draw->header.storage );
+
+ vf_destroy( draw->vf );
+
+ FREE( draw );
+}
+
+
+/**
+ * Rebuild the rendering pipeline.
+ */
+static void validate_pipeline( struct draw_context *draw )
+{
+ struct prim_stage *next = draw->pipeline.setup;
+
+ /* TODO: make the current primitive part of the state and build
+ * shorter pipelines for lines & points.
+ */
+ if (draw->setup.fill_cw != PIPE_POLYGON_MODE_FILL ||
+ draw->setup.fill_ccw != PIPE_POLYGON_MODE_FILL) {
+
+ draw->pipeline.unfilled->next = next;
+ next = draw->pipeline.unfilled;
+ }
+
+ if (draw->setup.offset_cw ||
+ draw->setup.offset_ccw) {
+ draw->pipeline.offset->next = next;
+ next = draw->pipeline.offset;
+ }
+
+ if (draw->setup.light_twoside) {
+ draw->pipeline.twoside->next = next;
+ next = draw->pipeline.twoside;
+ }
+
+ /* Always run the cull stage as we calculate determinant there
+ * also. Fix this..
+ */
+ {
+ draw->pipeline.cull->next = next;
+ next = draw->pipeline.cull;
+ }
+
+
+ /* Clip stage
+ */
+ {
+ draw->pipeline.clip->next = next;
+ next = draw->pipeline.clip;
+ }
+
+ /* Do software flatshading prior to clipping. XXX: should only do
+ * this for clipped primitives, ie it is a part of the clip
+ * routine.
+ */
+ if (draw->setup.flatshade) {
+ draw->pipeline.flatshade->next = next;
+ next = draw->pipeline.flatshade;
+ }
+
+
+ draw->pipeline.first = next;
+}
+
+
+/**
+ * Register new primitive setup/rendering state.
+ * This causes the drawing pipeline to be rebuilt.
+ */
+void draw_set_setup_state( struct draw_context *draw,
+ const struct pipe_setup_state *setup )
+{
+ memcpy( &draw->setup, setup, sizeof(*setup) );
+ validate_pipeline( draw );
+}
+
+
+/**
+ * Plug in the primitive rendering/rasterization stage.
+ * This is provided by the device driver.
+ */
+void draw_set_setup_stage( struct draw_context *draw,
+ struct prim_stage *stage )
+{
+ draw->pipeline.setup = stage;
+}
+
+
+/**
+ * Set the draw module's clipping state.
+ */
+void draw_set_clip_state( struct draw_context *draw,
+ const struct pipe_clip_state *clip )
+{
+ memcpy(&draw->plane[6], clip->ucp, clip->nr * sizeof(clip->ucp[0]));
+ draw->nr_planes = 6 + clip->nr;
+}
+
+
+/**
+ * Set the draw module's viewport state.
+ */
+void draw_set_viewport_state( struct draw_context *draw,
+ const struct pipe_viewport_state *viewport )
+{
+ draw->viewport = *viewport; /* struct copy */
+
+ vf_set_vp_scale_translate( draw->vf, viewport->scale, viewport->translate );
+
+ /* Using tnl/ and vf/ modules is temporary while getting started.
+ * Full pipe will have vertex shader, vertex fetch of its own.
+ */
+}