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
35
36 struct lp_rasterizer_state {
37 struct pipe_rasterizer_state lp_state;
38 struct pipe_rasterizer_state draw_state;
39 };
40
41
42 /* State which might be handled in either the draw module or locally.
43 * This function is used to turn that state off in one of the two
44 * places.
45 */
46 static void
clear_flags(struct pipe_rasterizer_state * rast)47 clear_flags(struct pipe_rasterizer_state *rast)
48 {
49 rast->light_twoside = 0;
50 rast->offset_tri = 0;
51 rast->offset_line = 0;
52 rast->offset_point = 0;
53 rast->offset_units = 0.0f;
54 rast->offset_scale = 0.0f;
55 }
56
57
58 static void *
llvmpipe_create_rasterizer_state(struct pipe_context * pipe,const struct pipe_rasterizer_state * rast)59 llvmpipe_create_rasterizer_state(struct pipe_context *pipe,
60 const struct pipe_rasterizer_state *rast)
61 {
62 bool need_pipeline;
63
64 /* Partition rasterizer state into what we want the draw module to
65 * handle, and what we'll look after ourselves.
66 */
67 struct lp_rasterizer_state *state = MALLOC_STRUCT(lp_rasterizer_state);
68 if (!state)
69 return NULL;
70
71 memcpy(&state->draw_state, rast, sizeof *rast);
72 memcpy(&state->lp_state, rast, sizeof *rast);
73
74 /* We rely on draw module to do unfilled polygons, AA lines and
75 * points and stipple.
76 *
77 * Over time, reduce this list of conditions, and expand the list
78 * of flags which get cleared in clear_flags().
79 */
80 need_pipeline = (rast->fill_front != PIPE_POLYGON_MODE_FILL ||
81 rast->fill_back != PIPE_POLYGON_MODE_FILL ||
82 rast->point_smooth ||
83 rast->line_smooth ||
84 rast->line_stipple_enable ||
85 rast->poly_stipple_enable);
86
87 /* If not using the pipeline, clear out the flags which we can
88 * handle ourselves. If we *are* using the pipeline, do everything
89 * on the pipeline and clear those flags on our internal copy of
90 * the state.
91 */
92 if (need_pipeline)
93 clear_flags(&state->lp_state);
94 else
95 clear_flags(&state->draw_state);
96
97 return state;
98 }
99
100
101 static void
llvmpipe_bind_rasterizer_state(struct pipe_context * pipe,void * handle)102 llvmpipe_bind_rasterizer_state(struct pipe_context *pipe, void *handle)
103 {
104 struct llvmpipe_context *llvmpipe = llvmpipe_context(pipe);
105 const struct lp_rasterizer_state *state =
106 (const struct lp_rasterizer_state *) handle;
107
108 if (state) {
109 llvmpipe->rasterizer = &state->lp_state;
110 draw_set_rasterizer_state(llvmpipe->draw, &state->draw_state, handle);
111 lp_setup_bind_rasterizer(llvmpipe->setup, &state->lp_state);
112 } else {
113 llvmpipe->rasterizer = NULL;
114 draw_set_rasterizer_state(llvmpipe->draw, NULL, handle);
115 }
116
117 llvmpipe->dirty |= LP_NEW_RASTERIZER;
118 }
119
120
121 static void
llvmpipe_delete_rasterizer_state(struct pipe_context * pipe,void * rasterizer)122 llvmpipe_delete_rasterizer_state(struct pipe_context *pipe,
123 void *rasterizer)
124 {
125 FREE(rasterizer);
126 }
127
128
129 void
llvmpipe_init_rasterizer_funcs(struct llvmpipe_context * llvmpipe)130 llvmpipe_init_rasterizer_funcs(struct llvmpipe_context *llvmpipe)
131 {
132 llvmpipe->pipe.create_rasterizer_state = llvmpipe_create_rasterizer_state;
133 llvmpipe->pipe.bind_rasterizer_state = llvmpipe_bind_rasterizer_state;
134 llvmpipe->pipe.delete_rasterizer_state = llvmpipe_delete_rasterizer_state;
135 }
136