st_atom_rasterizer.c revision beefc6011bce9e99cb46430186de1c13f027cb05 
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   /* _NEW_POLYGON, _NEW_BUFFERS
82    */
83   {
84      if (ctx->Polygon.FrontFace == GL_CCW)
85         raster.front_winding = PIPE_WINDING_CCW;
86      else
87         raster.front_winding = PIPE_WINDING_CW;
88
89      /* XXX
90       * I think the intention here is that user-created framebuffer objects
91       * use Y=0=TOP layout instead of OpenGL's normal Y=0=bottom layout.
92       * Flipping Y changes CW to CCW and vice-versa.
93       * But this is an implementation/driver-specific artifact - remove...
94       */
95      if (ctx->DrawBuffer && ctx->DrawBuffer->Name != 0)
96         raster.front_winding ^= PIPE_WINDING_BOTH;
97   }
98
99   /* _NEW_LIGHT
100    */
101   if (ctx->Light.ShadeModel == GL_FLAT)
102      raster.flatshade = 1;
103
104   /* _NEW_LIGHT | _NEW_PROGRAM
105    *
106    * Back-face colors can come from traditional lighting (when
107    * GL_LIGHT_MODEL_TWO_SIDE is set) or from vertex programs (when
108    * GL_VERTEX_PROGRAM_TWO_SIDE is set).  Note the logic here.
109    */
110   if (ctx->VertexProgram._Enabled) {
111      raster.light_twoside = ctx->VertexProgram.TwoSideEnabled;
112   }
113   else if (ctx->Light.Enabled && ctx->Light.Model.TwoSide) {
114      raster.light_twoside = 1;
115   }
116
117   /* _NEW_POLYGON
118    */
119   if (ctx->Polygon.CullFlag) {
120      if (ctx->Polygon.CullFaceMode == GL_FRONT_AND_BACK) {
121	 raster.cull_mode = PIPE_WINDING_BOTH;
122      }
123      else if (ctx->Polygon.CullFaceMode == GL_FRONT) {
124	 raster.cull_mode = raster.front_winding;
125      }
126      else {
127	 raster.cull_mode = raster.front_winding ^ PIPE_WINDING_BOTH;
128      }
129   }
130
131   /* _NEW_POLYGON
132    */
133   {
134      GLuint fill_front = translate_fill( ctx->Polygon.FrontMode );
135      GLuint fill_back = translate_fill( ctx->Polygon.BackMode );
136
137      if (raster.front_winding == PIPE_WINDING_CW) {
138	 raster.fill_cw = fill_front;
139	 raster.fill_ccw = fill_back;
140      }
141      else {
142	 raster.fill_cw = fill_back;
143	 raster.fill_ccw = fill_front;
144      }
145
146      /* Simplify when culling is active:
147       */
148      if (raster.cull_mode & PIPE_WINDING_CW) {
149	 raster.fill_cw = raster.fill_ccw;
150      }
151
152      if (raster.cull_mode & PIPE_WINDING_CCW) {
153	 raster.fill_ccw = raster.fill_cw;
154      }
155   }
156
157   /* _NEW_POLYGON
158    */
159   if (ctx->Polygon.OffsetUnits != 0.0 ||
160       ctx->Polygon.OffsetFactor != 0.0) {
161      raster.offset_cw = get_offset_flag( raster.fill_cw, &ctx->Polygon );
162      raster.offset_ccw = get_offset_flag( raster.fill_ccw, &ctx->Polygon );
163      raster.offset_units = ctx->Polygon.OffsetUnits;
164      raster.offset_scale = ctx->Polygon.OffsetFactor;
165   }
166
167   if (ctx->Polygon.SmoothFlag)
168      raster.poly_smooth = 1;
169
170   if (ctx->Polygon.StippleFlag)
171      raster.poly_stipple_enable = 1;
172
173
174   /* _NEW_BUFFERS, _NEW_POLYGON
175    */
176   if (raster.fill_cw != PIPE_POLYGON_MODE_FILL ||
177       raster.fill_ccw != PIPE_POLYGON_MODE_FILL)
178   {
179      GLfloat mrd = (ctx->DrawBuffer ?
180		     ctx->DrawBuffer->_MRD :
181		     1.0);
182
183      raster.offset_units = ctx->Polygon.OffsetFactor * mrd;
184      raster.offset_scale = (ctx->Polygon.OffsetUnits * mrd *
185			    st->polygon_offset_scale);
186   }
187
188   /* _NEW_POINT
189    */
190   raster.point_size = ctx->Point.Size;
191   raster.point_smooth = ctx->Point.SmoothFlag;
192   raster.point_sprite = ctx->Point.PointSprite;
193   for (i = 0; i < MAX_TEXTURE_COORD_UNITS; i++) {
194      if (ctx->Point.CoordReplace[i]) {
195         if (ctx->Point.SpriteOrigin == GL_UPPER_LEFT)
196            raster.sprite_coord_mode[i] = PIPE_SPRITE_COORD_UPPER_LEFT;
197         else
198            raster.sprite_coord_mode[i] = PIPE_SPRITE_COORD_LOWER_LEFT;
199      }
200      else {
201         raster.sprite_coord_mode[i] = PIPE_SPRITE_COORD_NONE;
202      }
203   }
204   raster.point_size_per_vertex = ctx->VertexProgram.PointSizeEnabled;
205
206   /* _NEW_LINE
207    */
208   raster.line_width = ctx->Line.Width;
209   raster.line_smooth = ctx->Line.SmoothFlag;
210   raster.line_stipple_enable = ctx->Line.StippleFlag;
211   raster.line_stipple_pattern = ctx->Line.StipplePattern;
212   /* GL stipple factor is in [1,256], remap to [0, 255] here */
213   raster.line_stipple_factor = ctx->Line.StippleFactor - 1;
214
215   /* _NEW_MULTISAMPLE */
216   if (ctx->Multisample.Enabled)
217      raster.multisample = 1;
218
219   /* _NEW_SCISSOR */
220   if (ctx->Scissor.Enabled)
221      raster.scissor = 1;
222
223   cso = st_cached_rasterizer_state(st, &raster);
224   if (st->state.rasterizer != cso) {
225      st->state.rasterizer = cso;
226      st->pipe->bind_rasterizer_state(st->pipe, cso->data);
227   }
228}
229
230const struct st_tracked_state st_update_rasterizer = {
231   .name = "st_update_rasterizer",
232   .dirty = {
233      .mesa = (_NEW_LIGHT | _NEW_POLYGON | _NEW_LINE | _NEW_SCISSOR |
234               _NEW_POINT | _NEW_BUFFERS | _NEW_MULTISAMPLE),
235      .st  = 0,
236   },
237   .update = update_raster_state
238};
239