1 /**********************************************************
2  * Copyright 2008-2009 VMware, Inc.  All rights reserved.
3  *
4  * Permission is hereby granted, free of charge, to any person
5  * obtaining a copy of this software and associated documentation
6  * files (the "Software"), to deal in the Software without
7  * restriction, including without limitation the rights to use, copy,
8  * modify, merge, publish, distribute, sublicense, and/or sell copies
9  * of the Software, and to permit persons to whom the Software is
10  * furnished to do so, subject to the following conditions:
11  *
12  * The above copyright notice and this permission notice shall be
13  * included in all copies or substantial portions of the Software.
14  *
15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
16  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
17  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
18  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
19  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
20  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
21  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
22  * SOFTWARE.
23  *
24  **********************************************************/
25 
26 #include "draw/draw_context.h"
27 #include "util/u_inlines.h"
28 #include "pipe/p_defines.h"
29 #include "util/u_math.h"
30 #include "util/u_memory.h"
31 
32 #include "svga_context.h"
33 
34 #include "svga_hw_reg.h"
35 
36 /* Hardware frontwinding is always set up as SVGA3D_FRONTWINDING_CW.
37  */
svga_translate_cullmode(unsigned mode,unsigned front_ccw)38 static SVGA3dFace svga_translate_cullmode( unsigned mode,
39                                            unsigned front_ccw )
40 {
41    const int hw_front_ccw = 0;  /* hardware is always CW */
42    switch (mode) {
43    case PIPE_FACE_NONE:
44       return SVGA3D_FACE_NONE;
45    case PIPE_FACE_FRONT:
46       return front_ccw == hw_front_ccw ? SVGA3D_FACE_FRONT : SVGA3D_FACE_BACK;
47    case PIPE_FACE_BACK:
48       return front_ccw == hw_front_ccw ? SVGA3D_FACE_BACK : SVGA3D_FACE_FRONT;
49    case PIPE_FACE_FRONT_AND_BACK:
50       return SVGA3D_FACE_FRONT_BACK;
51    default:
52       assert(0);
53       return SVGA3D_FACE_NONE;
54    }
55 }
56 
svga_translate_flatshade(unsigned mode)57 static SVGA3dShadeMode svga_translate_flatshade( unsigned mode )
58 {
59    return mode ? SVGA3D_SHADEMODE_FLAT : SVGA3D_SHADEMODE_SMOOTH;
60 }
61 
62 
63 static void *
svga_create_rasterizer_state(struct pipe_context * pipe,const struct pipe_rasterizer_state * templ)64 svga_create_rasterizer_state(struct pipe_context *pipe,
65                              const struct pipe_rasterizer_state *templ)
66 {
67    struct svga_context *svga = svga_context(pipe);
68    struct svga_rasterizer_state *rast = CALLOC_STRUCT( svga_rasterizer_state );
69 
70    /* need this for draw module. */
71    rast->templ = *templ;
72 
73    /* light_twoside          - XXX: need fragment shader variant */
74    /* poly_smooth            - XXX: no fallback available */
75    /* poly_stipple_enable    - draw module */
76    /* sprite_coord_enable    - ? */
77    /* point_quad_rasterization - ? */
78    /* point_size_per_vertex  - ? */
79    /* sprite_coord_mode      - ??? */
80    /* flatshade_first        - handled by index translation */
81    /* gl_rasterization_rules - XXX - viewport code */
82    /* line_width             - draw module */
83    /* fill_cw, fill_ccw      - draw module or index translation */
84 
85    rast->shademode = svga_translate_flatshade( templ->flatshade );
86    rast->cullmode = svga_translate_cullmode( templ->cull_face,
87                                              templ->front_ccw );
88    rast->scissortestenable = templ->scissor;
89    rast->multisampleantialias = templ->multisample;
90    rast->antialiasedlineenable = templ->line_smooth;
91    rast->lastpixel = templ->line_last_pixel;
92    rast->pointsprite = templ->sprite_coord_enable != 0x0;
93    rast->pointsize = templ->point_size;
94    rast->hw_unfilled = PIPE_POLYGON_MODE_FILL;
95 
96    /* Use swtnl + decomposition implement these:
97     */
98    if (templ->poly_stipple_enable) {
99       rast->need_pipeline |= SVGA_PIPELINE_FLAG_TRIS;
100       rast->need_pipeline_tris_str = "poly stipple";
101    }
102 
103    if (templ->line_width >= 1.5f &&
104        !svga->debug.no_line_width) {
105       rast->need_pipeline |= SVGA_PIPELINE_FLAG_LINES;
106       rast->need_pipeline_lines_str = "line width";
107    }
108 
109    if (templ->line_stipple_enable) {
110       /* XXX: LinePattern not implemented on all backends, and there is no
111        * mechanism to query it.
112        */
113       if (!svga->debug.force_hw_line_stipple) {
114          SVGA3dLinePattern lp;
115          lp.repeat = templ->line_stipple_factor + 1;
116          lp.pattern = templ->line_stipple_pattern;
117          rast->linepattern = lp.uintValue;
118       }
119       else {
120          rast->need_pipeline |= SVGA_PIPELINE_FLAG_LINES;
121          rast->need_pipeline_lines_str = "line stipple";
122       }
123    }
124 
125    if (templ->point_smooth) {
126       rast->need_pipeline |= SVGA_PIPELINE_FLAG_POINTS;
127       rast->need_pipeline_points_str = "smooth points";
128    }
129 
130    if (templ->line_smooth) {
131       rast->need_pipeline |= SVGA_PIPELINE_FLAG_LINES;
132       rast->need_pipeline_lines_str = "smooth lines";
133    }
134 
135    {
136       int fill_front = templ->fill_front;
137       int fill_back = templ->fill_back;
138       int fill = PIPE_POLYGON_MODE_FILL;
139       boolean offset_front = util_get_offset(templ, fill_front);
140       boolean offset_back = util_get_offset(templ, fill_back);
141       boolean offset  = 0;
142 
143       switch (templ->cull_face) {
144       case PIPE_FACE_FRONT_AND_BACK:
145          offset = 0;
146          fill = PIPE_POLYGON_MODE_FILL;
147          break;
148 
149       case PIPE_FACE_FRONT:
150          offset = offset_front;
151          fill = fill_front;
152          break;
153 
154       case PIPE_FACE_BACK:
155          offset = offset_back;
156          fill = fill_back;
157          break;
158 
159       case PIPE_FACE_NONE:
160          if (fill_front != fill_back || offset_front != offset_back)
161          {
162             /* Always need the draw module to work out different
163              * front/back fill modes:
164              */
165             rast->need_pipeline |= SVGA_PIPELINE_FLAG_TRIS;
166             rast->need_pipeline_tris_str = "different front/back fillmodes";
167          }
168          else {
169             offset = offset_front;
170             fill = fill_front;
171          }
172          break;
173 
174       default:
175          assert(0);
176          break;
177       }
178 
179       /* Unfilled primitive modes aren't implemented on all virtual
180        * hardware.  We can do some unfilled processing with index
181        * translation, but otherwise need the draw module:
182        */
183       if (fill != PIPE_POLYGON_MODE_FILL &&
184           (templ->flatshade ||
185            templ->light_twoside ||
186            offset ||
187            templ->cull_face != PIPE_FACE_NONE))
188       {
189          fill = PIPE_POLYGON_MODE_FILL;
190          rast->need_pipeline |= SVGA_PIPELINE_FLAG_TRIS;
191          rast->need_pipeline_tris_str = "unfilled primitives with no index manipulation";
192       }
193 
194       /* If we are decomposing to lines, and lines need the pipeline,
195        * then we also need the pipeline for tris.
196        */
197       if (fill == PIPE_POLYGON_MODE_LINE &&
198           (rast->need_pipeline & SVGA_PIPELINE_FLAG_LINES))
199       {
200          fill = PIPE_POLYGON_MODE_FILL;
201          rast->need_pipeline |= SVGA_PIPELINE_FLAG_TRIS;
202          rast->need_pipeline_tris_str = "decomposing lines";
203       }
204 
205       /* Similarly for points:
206        */
207       if (fill == PIPE_POLYGON_MODE_POINT &&
208           (rast->need_pipeline & SVGA_PIPELINE_FLAG_POINTS))
209       {
210          fill = PIPE_POLYGON_MODE_FILL;
211          rast->need_pipeline |= SVGA_PIPELINE_FLAG_TRIS;
212          rast->need_pipeline_tris_str = "decomposing points";
213       }
214 
215       if (offset) {
216          rast->slopescaledepthbias = templ->offset_scale;
217          rast->depthbias = templ->offset_units;
218       }
219 
220       rast->hw_unfilled = fill;
221    }
222 
223    if (rast->need_pipeline & SVGA_PIPELINE_FLAG_TRIS) {
224       /* Turn off stuff which will get done in the draw module:
225        */
226       rast->hw_unfilled = PIPE_POLYGON_MODE_FILL;
227       rast->slopescaledepthbias = 0;
228       rast->depthbias = 0;
229    }
230 
231    return rast;
232 }
233 
svga_bind_rasterizer_state(struct pipe_context * pipe,void * state)234 static void svga_bind_rasterizer_state( struct pipe_context *pipe,
235                                         void *state )
236 {
237    struct svga_context *svga = svga_context(pipe);
238    struct svga_rasterizer_state *raster = (struct svga_rasterizer_state *)state;
239 
240 
241    draw_set_rasterizer_state(svga->swtnl.draw, raster ? &raster->templ : NULL,
242                              state);
243    svga->curr.rast = raster;
244 
245    svga->dirty |= SVGA_NEW_RAST;
246 }
247 
svga_delete_rasterizer_state(struct pipe_context * pipe,void * raster)248 static void svga_delete_rasterizer_state(struct pipe_context *pipe,
249                                          void *raster)
250 {
251    FREE(raster);
252 }
253 
254 
svga_init_rasterizer_functions(struct svga_context * svga)255 void svga_init_rasterizer_functions( struct svga_context *svga )
256 {
257    svga->pipe.create_rasterizer_state = svga_create_rasterizer_state;
258    svga->pipe.bind_rasterizer_state = svga_bind_rasterizer_state;
259    svga->pipe.delete_rasterizer_state = svga_delete_rasterizer_state;
260 }
261 
262 
263 /***********************************************************************
264  * Hardware state update
265  */
266 
267