st_atom_rasterizer.c revision 52da6b559a47eca2c1a8ec1b713e188f38e1d16a 
1/**************************************************************************
2 *
3 * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
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 TUNGSTEN GRAPHICS 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 /*
29  * Authors:
30  *   Keith Whitwell <keith@tungstengraphics.com>
31  */
32
33
34#include "st_context.h"
35#include "st_cache.h"
36#include "pipe/p_context.h"
37#include "pipe/p_defines.h"
38#include "st_atom.h"
39
40static GLuint translate_fill( GLenum mode )
41{
42   switch (mode) {
43   case GL_POINT:
44      return PIPE_POLYGON_MODE_POINT;
45   case GL_LINE:
46      return PIPE_POLYGON_MODE_LINE;
47   case GL_FILL:
48      return PIPE_POLYGON_MODE_FILL;
49   default:
50      assert(0);
51      return 0;
52   }
53}
54
55static GLboolean get_offset_flag( GLuint fill_mode,
56				  const struct gl_polygon_attrib *p )
57{
58   switch (fill_mode) {
59   case PIPE_POLYGON_MODE_POINT:
60      return p->OffsetPoint;
61   case PIPE_POLYGON_MODE_LINE:
62      return p->OffsetLine;
63   case PIPE_POLYGON_MODE_FILL:
64      return p->OffsetFill;
65   default:
66      assert(0);
67      return 0;
68   }
69}
70
71
72static void update_raster_state( struct st_context *st )
73{
74   GLcontext *ctx = st->ctx;
75   struct pipe_rasterizer_state raster;
76   const struct cso_rasterizer *cso;
77   uint i;
78
79   memset(&raster, 0, sizeof(raster));
80
81   raster.origin_lower_left = 1; /* Always true for OpenGL */
82
83   /* _NEW_POLYGON, _NEW_BUFFERS
84    */
85   {
86      if (ctx->Polygon.FrontFace == GL_CCW)
87         raster.front_winding = PIPE_WINDING_CCW;
88      else
89         raster.front_winding = PIPE_WINDING_CW;
90
91      /* XXX
92       * I think the intention here is that user-created framebuffer objects
93       * use Y=0=TOP layout instead of OpenGL's normal Y=0=bottom layout.
94       * Flipping Y changes CW to CCW and vice-versa.
95       * But this is an implementation/driver-specific artifact - remove...
96       */
97      if (ctx->DrawBuffer && ctx->DrawBuffer->Name != 0)
98         raster.front_winding ^= PIPE_WINDING_BOTH;
99   }
100
101   /* _NEW_LIGHT
102    */
103   if (ctx->Light.ShadeModel == GL_FLAT)
104      raster.flatshade = 1;
105
106   /* _NEW_LIGHT | _NEW_PROGRAM
107    *
108    * Back-face colors can come from traditional lighting (when
109    * GL_LIGHT_MODEL_TWO_SIDE is set) or from vertex programs (when
110    * GL_VERTEX_PROGRAM_TWO_SIDE is set).  Note the logic here.
111    */
112   if (ctx->VertexProgram._Current) {
113      raster.light_twoside = ctx->VertexProgram.TwoSideEnabled;
114   }
115   else if (ctx->Light.Enabled && ctx->Light.Model.TwoSide) {
116      raster.light_twoside = 1;
117   }
118
119   /* _NEW_POLYGON
120    */
121   if (ctx->Polygon.CullFlag) {
122      if (ctx->Polygon.CullFaceMode == GL_FRONT_AND_BACK) {
123	 raster.cull_mode = PIPE_WINDING_BOTH;
124      }
125      else if (ctx->Polygon.CullFaceMode == GL_FRONT) {
126	 raster.cull_mode = raster.front_winding;
127      }
128      else {
129	 raster.cull_mode = raster.front_winding ^ PIPE_WINDING_BOTH;
130      }
131   }
132
133   /* _NEW_POLYGON
134    */
135   {
136      GLuint fill_front = translate_fill( ctx->Polygon.FrontMode );
137      GLuint fill_back = translate_fill( ctx->Polygon.BackMode );
138
139      if (raster.front_winding == PIPE_WINDING_CW) {
140	 raster.fill_cw = fill_front;
141	 raster.fill_ccw = fill_back;
142      }
143      else {
144	 raster.fill_cw = fill_back;
145	 raster.fill_ccw = fill_front;
146      }
147
148      /* Simplify when culling is active:
149       */
150      if (raster.cull_mode & PIPE_WINDING_CW) {
151	 raster.fill_cw = raster.fill_ccw;
152      }
153
154      if (raster.cull_mode & PIPE_WINDING_CCW) {
155	 raster.fill_ccw = raster.fill_cw;
156      }
157   }
158
159   /* _NEW_POLYGON
160    */
161   if (ctx->Polygon.OffsetUnits != 0.0 ||
162       ctx->Polygon.OffsetFactor != 0.0) {
163      raster.offset_cw = get_offset_flag( raster.fill_cw, &ctx->Polygon );
164      raster.offset_ccw = get_offset_flag( raster.fill_ccw, &ctx->Polygon );
165      raster.offset_units = ctx->Polygon.OffsetUnits;
166      raster.offset_scale = ctx->Polygon.OffsetFactor;
167   }
168
169   if (ctx->Polygon.SmoothFlag)
170      raster.poly_smooth = 1;
171
172   if (ctx->Polygon.StippleFlag)
173      raster.poly_stipple_enable = 1;
174
175
176   /* _NEW_BUFFERS, _NEW_POLYGON
177    */
178   if (raster.fill_cw != PIPE_POLYGON_MODE_FILL ||
179       raster.fill_ccw != PIPE_POLYGON_MODE_FILL)
180   {
181      GLfloat mrd = (ctx->DrawBuffer ?
182		     ctx->DrawBuffer->_MRD :
183		     1.0);
184
185      raster.offset_units = ctx->Polygon.OffsetFactor * mrd;
186      raster.offset_scale = (ctx->Polygon.OffsetUnits * mrd *
187			    st->polygon_offset_scale);
188   }
189
190   /* _NEW_POINT
191    */
192   raster.point_size = ctx->Point.Size;
193   raster.point_smooth = ctx->Point.SmoothFlag;
194   raster.point_sprite = ctx->Point.PointSprite;
195   for (i = 0; i < MAX_TEXTURE_COORD_UNITS; i++) {
196      if (ctx->Point.CoordReplace[i]) {
197         if (ctx->Point.SpriteOrigin == GL_UPPER_LEFT)
198            raster.sprite_coord_mode[i] = PIPE_SPRITE_COORD_UPPER_LEFT;
199         else
200            raster.sprite_coord_mode[i] = PIPE_SPRITE_COORD_LOWER_LEFT;
201      }
202      else {
203         raster.sprite_coord_mode[i] = PIPE_SPRITE_COORD_NONE;
204      }
205   }
206   raster.point_size_per_vertex = ctx->VertexProgram.PointSizeEnabled;
207
208   /* _NEW_LINE
209    */
210   raster.line_width = ctx->Line.Width;
211   raster.line_smooth = ctx->Line.SmoothFlag;
212   raster.line_stipple_enable = ctx->Line.StippleFlag;
213   raster.line_stipple_pattern = ctx->Line.StipplePattern;
214   /* GL stipple factor is in [1,256], remap to [0, 255] here */
215   raster.line_stipple_factor = ctx->Line.StippleFactor - 1;
216
217   /* _NEW_MULTISAMPLE */
218   if (ctx->Multisample.Enabled)
219      raster.multisample = 1;
220
221   /* _NEW_SCISSOR */
222   if (ctx->Scissor.Enabled)
223      raster.scissor = 1;
224
225   cso = st_cached_rasterizer_state(st, &raster);
226   if (st->state.rasterizer != cso) {
227      st->state.rasterizer = cso;
228      st->pipe->bind_rasterizer_state(st->pipe, cso->data);
229   }
230}
231
232const struct st_tracked_state st_update_rasterizer = {
233   .name = "st_update_rasterizer",
234   .dirty = {
235      .mesa = (_NEW_LIGHT | _NEW_POLYGON | _NEW_LINE | _NEW_SCISSOR |
236               _NEW_POINT | _NEW_BUFFERS | _NEW_MULTISAMPLE),
237      .st  = 0,
238   },
239   .update = update_raster_state
240};
241