1/**************************************************************************
2 *
3 * Copyright 2007 VMware, Inc.
4 * All Rights Reserved.
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the
8 * "Software"), to deal in the Software without restriction, including
9 * without limitation the rights to use, copy, modify, merge, publish,
10 * distribute, sub license, and/or sell copies of the Software, and to
11 * permit persons to whom the Software is furnished to do so, subject to
12 * the following conditions:
13 *
14 * The above copyright notice and this permission notice (including the
15 * next paragraph) shall be included in all copies or substantial portions
16 * of the Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
20 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
21 * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
22 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
23 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
24 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
25 *
26 **************************************************************************/
27
28#include "pipe/p_defines.h"
29#include "util/u_memory.h"
30#include "lp_context.h"
31#include "lp_state.h"
32#include "lp_setup.h"
33#include "draw/draw_context.h"
34
35struct lp_rast_state {
36   struct pipe_rasterizer_state lp_state;
37   struct pipe_rasterizer_state draw_state;
38};
39
40/* State which might be handled in either the draw module or locally.
41 * This function is used to turn that state off in one of the two
42 * places.
43 */
44static void
45clear_flags(struct pipe_rasterizer_state *rast)
46{
47   rast->light_twoside = 0;
48   rast->offset_tri = 0;
49   rast->offset_line = 0;
50   rast->offset_point = 0;
51   rast->offset_units = 0.0f;
52   rast->offset_scale = 0.0f;
53}
54
55
56
57static void *
58llvmpipe_create_rasterizer_state(struct pipe_context *pipe,
59                                 const struct pipe_rasterizer_state *rast)
60{
61   boolean need_pipeline;
62
63   /* Partition rasterizer state into what we want the draw module to
64    * handle, and what we'll look after ourselves.
65    */
66   struct lp_rast_state *state = MALLOC_STRUCT(lp_rast_state);
67   if (!state)
68      return NULL;
69
70   memcpy(&state->draw_state, rast, sizeof *rast);
71   memcpy(&state->lp_state, rast, sizeof *rast);
72
73   /* We rely on draw module to do unfilled polyons, AA lines and
74    * points and stipple.
75    *
76    * Over time, reduce this list of conditions, and expand the list
77    * of flags which get cleared in clear_flags().
78    */
79   need_pipeline = (rast->fill_front != PIPE_POLYGON_MODE_FILL ||
80		    rast->fill_back != PIPE_POLYGON_MODE_FILL ||
81		    rast->point_smooth ||
82		    rast->line_smooth ||
83		    rast->line_stipple_enable ||
84		    rast->poly_stipple_enable);
85
86   /* If not using the pipeline, clear out the flags which we can
87    * handle ourselves.  If we *are* using the pipeline, do everything
88    * on the pipeline and clear those flags on our internal copy of
89    * the state.
90    */
91   if (need_pipeline)
92      clear_flags(&state->lp_state);
93   else
94      clear_flags(&state->draw_state);
95
96   return state;
97}
98
99
100
101static void
102llvmpipe_bind_rasterizer_state(struct pipe_context *pipe, void *handle)
103{
104   struct llvmpipe_context *llvmpipe = llvmpipe_context(pipe);
105   const struct lp_rast_state *state =
106      (const struct lp_rast_state *) handle;
107
108   if (state) {
109      llvmpipe->rasterizer = &state->lp_state;
110      draw_set_rasterizer_state(llvmpipe->draw, &state->draw_state, handle);
111
112      /* XXX: just pass lp_state directly to setup.
113       */
114      lp_setup_set_triangle_state( llvmpipe->setup,
115                                  state->lp_state.cull_face,
116                                  state->lp_state.front_ccw,
117                                  state->lp_state.scissor,
118                                  state->lp_state.half_pixel_center,
119                                  state->lp_state.bottom_edge_rule);
120      lp_setup_set_flatshade_first( llvmpipe->setup,
121				    state->lp_state.flatshade_first);
122      lp_setup_set_line_state( llvmpipe->setup,
123                              state->lp_state.line_width);
124      lp_setup_set_point_state( llvmpipe->setup,
125                               state->lp_state.point_size,
126                               state->lp_state.point_size_per_vertex,
127                               state->lp_state.sprite_coord_enable,
128                               state->lp_state.sprite_coord_mode);
129   }
130   else {
131      llvmpipe->rasterizer = NULL;
132      draw_set_rasterizer_state(llvmpipe->draw, NULL, handle);
133   }
134
135   llvmpipe->dirty |= LP_NEW_RASTERIZER;
136}
137
138
139static void
140llvmpipe_delete_rasterizer_state(struct pipe_context *pipe,
141                                 void *rasterizer)
142{
143   FREE( rasterizer );
144}
145
146
147
148void
149llvmpipe_init_rasterizer_funcs(struct llvmpipe_context *llvmpipe)
150{
151   llvmpipe->pipe.create_rasterizer_state = llvmpipe_create_rasterizer_state;
152   llvmpipe->pipe.bind_rasterizer_state   = llvmpipe_bind_rasterizer_state;
153   llvmpipe->pipe.delete_rasterizer_state = llvmpipe_delete_rasterizer_state;
154}
155