st_atom_rasterizer.c revision 6c534b830c6f5427c391c5225c34561141c201ba 
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#include "main/macros.h"
34#include "st_context.h"
35#include "st_atom.h"
36#include "pipe/p_context.h"
37#include "pipe/p_defines.h"
38#include "cso_cache/cso_context.h"
39
40
41static GLuint translate_fill( GLenum mode )
42{
43   switch (mode) {
44   case GL_POINT:
45      return PIPE_POLYGON_MODE_POINT;
46   case GL_LINE:
47      return PIPE_POLYGON_MODE_LINE;
48   case GL_FILL:
49      return PIPE_POLYGON_MODE_FILL;
50   default:
51      assert(0);
52      return 0;
53   }
54}
55
56static GLboolean get_offset_flag( GLuint fill_mode,
57				  const struct gl_polygon_attrib *p )
58{
59   switch (fill_mode) {
60   case PIPE_POLYGON_MODE_POINT:
61      return p->OffsetPoint;
62   case PIPE_POLYGON_MODE_LINE:
63      return p->OffsetLine;
64   case PIPE_POLYGON_MODE_FILL:
65      return p->OffsetFill;
66   default:
67      assert(0);
68      return 0;
69   }
70}
71
72
73static void update_raster_state( struct st_context *st )
74{
75   GLcontext *ctx = st->ctx;
76   struct pipe_rasterizer_state *raster = &st->state.rasterizer;
77   const struct gl_vertex_program *vertProg = ctx->VertexProgram._Current;
78   uint i;
79
80   memset(raster, 0, sizeof(*raster));
81
82   raster->origin_lower_left = 1; /* Always true for OpenGL */
83
84   /* _NEW_POLYGON, _NEW_BUFFERS
85    */
86   {
87      if (ctx->Polygon.FrontFace == GL_CCW)
88         raster->front_winding = PIPE_WINDING_CCW;
89      else
90         raster->front_winding = PIPE_WINDING_CW;
91
92      /* XXX
93       * I think the intention here is that user-created framebuffer objects
94       * use Y=0=TOP layout instead of OpenGL's normal Y=0=bottom layout.
95       * Flipping Y changes CW to CCW and vice-versa.
96       * But this is an implementation/driver-specific artifact - remove...
97       */
98      if (ctx->DrawBuffer && ctx->DrawBuffer->Name != 0)
99         raster->front_winding ^= PIPE_WINDING_BOTH;
100   }
101
102   /* _NEW_LIGHT
103    */
104   if (ctx->Light.ShadeModel == GL_FLAT)
105      raster->flatshade = 1;
106
107   /* _NEW_LIGHT | _NEW_PROGRAM
108    *
109    * Back-face colors can come from traditional lighting (when
110    * GL_LIGHT_MODEL_TWO_SIDE is set) or from vertex programs (when
111    * GL_VERTEX_PROGRAM_TWO_SIDE is set).  Note the logic here.
112    */
113   if (ctx->VertexProgram._Current) {
114      if (ctx->VertexProgram._Enabled) {
115         /* user-defined program */
116         raster->light_twoside = ctx->VertexProgram.TwoSideEnabled;
117      }
118      else {
119         /* TNL-generated program */
120         raster->light_twoside = ctx->Light.Enabled && ctx->Light.Model.TwoSide;
121      }
122   }
123   else if (ctx->Light.Enabled && ctx->Light.Model.TwoSide) {
124      raster->light_twoside = 1;
125   }
126
127   /* _NEW_POLYGON
128    */
129   if (ctx->Polygon.CullFlag) {
130      if (ctx->Polygon.CullFaceMode == GL_FRONT_AND_BACK) {
131	 raster->cull_mode = PIPE_WINDING_BOTH;
132      }
133      else if (ctx->Polygon.CullFaceMode == GL_FRONT) {
134	 raster->cull_mode = raster->front_winding;
135      }
136      else {
137	 raster->cull_mode = raster->front_winding ^ PIPE_WINDING_BOTH;
138      }
139   }
140
141   /* _NEW_POLYGON
142    */
143   {
144      GLuint fill_front = translate_fill( ctx->Polygon.FrontMode );
145      GLuint fill_back = translate_fill( ctx->Polygon.BackMode );
146
147      if (raster->front_winding == PIPE_WINDING_CW) {
148	 raster->fill_cw = fill_front;
149	 raster->fill_ccw = fill_back;
150      }
151      else {
152	 raster->fill_cw = fill_back;
153	 raster->fill_ccw = fill_front;
154      }
155
156      /* Simplify when culling is active:
157       */
158      if (raster->cull_mode & PIPE_WINDING_CW) {
159	 raster->fill_cw = raster->fill_ccw;
160      }
161
162      if (raster->cull_mode & PIPE_WINDING_CCW) {
163	 raster->fill_ccw = raster->fill_cw;
164      }
165   }
166
167   /* _NEW_POLYGON
168    */
169   if (ctx->Polygon.OffsetUnits != 0.0 ||
170       ctx->Polygon.OffsetFactor != 0.0) {
171      raster->offset_cw = get_offset_flag( raster->fill_cw, &ctx->Polygon );
172      raster->offset_ccw = get_offset_flag( raster->fill_ccw, &ctx->Polygon );
173      raster->offset_units = ctx->Polygon.OffsetUnits;
174      raster->offset_scale = ctx->Polygon.OffsetFactor;
175   }
176
177   if (ctx->Polygon.SmoothFlag)
178      raster->poly_smooth = 1;
179
180   if (ctx->Polygon.StippleFlag)
181      raster->poly_stipple_enable = 1;
182
183
184   /* _NEW_BUFFERS, _NEW_POLYGON
185    */
186   if (raster->fill_cw != PIPE_POLYGON_MODE_FILL ||
187       raster->fill_ccw != PIPE_POLYGON_MODE_FILL)
188   {
189      GLfloat mrd = (ctx->DrawBuffer ?
190		     ctx->DrawBuffer->_MRD :
191		     1.0f);
192
193      raster->offset_units = ctx->Polygon.OffsetFactor * mrd;
194      raster->offset_scale = (ctx->Polygon.OffsetUnits * mrd *
195			    st->polygon_offset_scale);
196   }
197
198   /* _NEW_POINT
199    */
200   raster->point_size = ctx->Point.Size;
201
202   raster->point_size_min = 0;    /* temporary, will go away */
203   raster->point_size_max = 1000; /* temporary, will go away */
204
205   raster->point_smooth = ctx->Point.SmoothFlag;
206   raster->point_sprite = ctx->Point.PointSprite;
207   for (i = 0; i < MAX_TEXTURE_COORD_UNITS; i++) {
208      if (ctx->Point.CoordReplace[i]) {
209         if (ctx->Point.SpriteOrigin == GL_UPPER_LEFT)
210            raster->sprite_coord_mode[i] = PIPE_SPRITE_COORD_UPPER_LEFT;
211         else
212            raster->sprite_coord_mode[i] = PIPE_SPRITE_COORD_LOWER_LEFT;
213      }
214      else {
215         raster->sprite_coord_mode[i] = PIPE_SPRITE_COORD_NONE;
216      }
217   }
218   if (vertProg) {
219      if (vertProg->Base.Id == 0) {
220         if (vertProg->Base.OutputsWritten & (1 << VERT_RESULT_PSIZ)) {
221            /* generated program which emits point size */
222            raster->point_size_per_vertex = TRUE;
223         }
224      }
225      else if (ctx->VertexProgram.PointSizeEnabled) {
226         /* user-defined program and GL_VERTEX_PROGRAM_POINT_SIZE set */
227         raster->point_size_per_vertex = ctx->VertexProgram.PointSizeEnabled;
228      }
229   }
230   if (!raster->point_size_per_vertex) {
231      /* clamp size now */
232      raster->point_size = CLAMP(ctx->Point.Size,
233                                 ctx->Point.MinSize,
234                                 ctx->Point.MaxSize);
235   }
236
237   /* _NEW_LINE
238    */
239   raster->line_smooth = ctx->Line.SmoothFlag;
240   if (ctx->Line.SmoothFlag) {
241      raster->line_width = CLAMP(ctx->Line.Width,
242                                ctx->Const.MinLineWidthAA,
243                                ctx->Const.MaxLineWidthAA);
244   }
245   else {
246      raster->line_width = CLAMP(ctx->Line.Width,
247                                ctx->Const.MinLineWidth,
248                                ctx->Const.MaxLineWidth);
249   }
250
251   raster->line_stipple_enable = ctx->Line.StippleFlag;
252   raster->line_stipple_pattern = ctx->Line.StipplePattern;
253   /* GL stipple factor is in [1,256], remap to [0, 255] here */
254   raster->line_stipple_factor = ctx->Line.StippleFactor - 1;
255
256   /* _NEW_MULTISAMPLE */
257   if (ctx->Multisample._Enabled)
258      raster->multisample = 1;
259
260   /* _NEW_SCISSOR */
261   if (ctx->Scissor.Enabled)
262      raster->scissor = 1;
263
264   raster->gl_rasterization_rules = 1;
265
266   cso_set_rasterizer(st->cso_context, raster);
267}
268
269const struct st_tracked_state st_update_rasterizer = {
270   "st_update_rasterizer",					/* name */
271   {								/* dirty */
272      (_NEW_LIGHT | _NEW_POLYGON | _NEW_LINE | _NEW_SCISSOR |	/* mesa */
273               _NEW_POINT | _NEW_BUFFERS | _NEW_MULTISAMPLE),
274      0,							/* st */
275   },
276   update_raster_state						/* update */
277};
278