st_atom_rasterizer.c revision de69fc1703f79e5c97e66b654de7a93b7abce8f0 
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 pipe_rasterizer_state *cached;
77
78   memset(&raster, 0, sizeof(raster));
79
80   /* _NEW_POLYGON, _NEW_BUFFERS
81    */
82   {
83      if (ctx->Polygon.FrontFace == GL_CCW)
84         raster.front_winding = PIPE_WINDING_CCW;
85      else
86         raster.front_winding = PIPE_WINDING_CW;
87
88      /* XXX
89       * I think the intention here is that user-created framebuffer objects
90       * use Y=0=TOP layout instead of OpenGL's normal Y=0=bottom layout.
91       * Flipping Y changes CW to CCW and vice-versa.
92       * But this is an implementation/driver-specific artifact - remove...
93       */
94      if (ctx->DrawBuffer && ctx->DrawBuffer->Name != 0)
95         raster.front_winding ^= PIPE_WINDING_BOTH;
96   }
97
98   /* _NEW_LIGHT
99    */
100   if (ctx->Light.ShadeModel == GL_FLAT)
101      raster.flatshade = 1;
102
103   /* _NEW_LIGHT | _NEW_PROGRAM
104    *
105    * Back-face colors can come from traditional lighting (when
106    * GL_LIGHT_MODEL_TWO_SIDE is set) or from vertex programs (when
107    * GL_VERTEX_PROGRAM_TWO_SIDE is set).  Note the logic here.
108    */
109   if (ctx->VertexProgram._Enabled) {
110      raster.light_twoside = ctx->VertexProgram.TwoSideEnabled;
111   }
112   else if (ctx->Light.Enabled && ctx->Light.Model.TwoSide) {
113      raster.light_twoside = 1;
114   }
115
116   /* _NEW_POLYGON
117    */
118   if (ctx->Polygon.CullFlag) {
119      if (ctx->Polygon.CullFaceMode == GL_FRONT_AND_BACK) {
120	 raster.cull_mode = PIPE_WINDING_BOTH;
121      }
122      else if (ctx->Polygon.CullFaceMode == GL_FRONT) {
123	 raster.cull_mode = raster.front_winding;
124      }
125      else {
126	 raster.cull_mode = raster.front_winding ^ PIPE_WINDING_BOTH;
127      }
128   }
129
130   /* _NEW_POLYGON
131    */
132   {
133      GLuint fill_front = translate_fill( ctx->Polygon.FrontMode );
134      GLuint fill_back = translate_fill( ctx->Polygon.BackMode );
135
136      if (raster.front_winding == PIPE_WINDING_CW) {
137	 raster.fill_cw = fill_front;
138	 raster.fill_ccw = fill_back;
139      }
140      else {
141	 raster.fill_cw = fill_back;
142	 raster.fill_ccw = fill_front;
143      }
144
145      /* Simplify when culling is active:
146       */
147      if (raster.cull_mode & PIPE_WINDING_CW) {
148	 raster.fill_cw = raster.fill_ccw;
149      }
150
151      if (raster.cull_mode & PIPE_WINDING_CCW) {
152	 raster.fill_ccw = raster.fill_cw;
153      }
154   }
155
156   /* _NEW_POLYGON
157    */
158   if (ctx->Polygon.OffsetUnits != 0.0 ||
159       ctx->Polygon.OffsetFactor != 0.0) {
160      raster.offset_cw = get_offset_flag( raster.fill_cw, &ctx->Polygon );
161      raster.offset_ccw = get_offset_flag( raster.fill_ccw, &ctx->Polygon );
162      raster.offset_units = ctx->Polygon.OffsetUnits;
163      raster.offset_scale = ctx->Polygon.OffsetFactor;
164   }
165
166   if (ctx->Polygon.SmoothFlag)
167      raster.poly_smooth = 1;
168
169   if (ctx->Polygon.StippleFlag)
170      raster.poly_stipple_enable = 1;
171
172
173   /* _NEW_BUFFERS, _NEW_POLYGON
174    */
175   if (raster.fill_cw != PIPE_POLYGON_MODE_FILL ||
176       raster.fill_ccw != PIPE_POLYGON_MODE_FILL)
177   {
178      GLfloat mrd = (ctx->DrawBuffer ?
179		     ctx->DrawBuffer->_MRD :
180		     1.0);
181
182      raster.offset_units = ctx->Polygon.OffsetFactor * mrd;
183      raster.offset_scale = (ctx->Polygon.OffsetUnits * mrd *
184			    st->polygon_offset_scale);
185   }
186
187   /* _NEW_POINT
188    */
189   raster.point_size = ctx->Point.Size;
190   raster.point_smooth = ctx->Point.SmoothFlag;
191
192   /* _NEW_LINE
193    */
194   raster.line_width = ctx->Line.Width;
195   raster.line_smooth = ctx->Line.SmoothFlag;
196   raster.line_stipple_enable = ctx->Line.StippleFlag;
197   raster.line_stipple_pattern = ctx->Line.StipplePattern;
198   /* GL stipple factor is in [1,256], remap to [0, 255] here */
199   raster.line_stipple_factor = ctx->Line.StippleFactor - 1;
200
201   /* _NEW_MULTISAMPLE */
202   if (ctx->Multisample.Enabled)
203      raster.multisample = 1;
204
205   /* _NEW_SCISSOR */
206   if (ctx->Scissor.Enabled)
207      raster.scissor = 1;
208
209   cached = st_cached_rasterizer_state(st, &raster);
210   if (st->state.rasterizer != cached) {
211      st->state.rasterizer = cached;
212      st->pipe->bind_rasterizer_state( st->pipe, cached );
213   }
214}
215
216const struct st_tracked_state st_update_rasterizer = {
217   .name = "st_update_rasterizer",
218   .dirty = {
219      .mesa = (_NEW_LIGHT | _NEW_POLYGON | _NEW_LINE | _NEW_SCISSOR |
220               _NEW_POINT | _NEW_BUFFERS | _NEW_MULTISAMPLE),
221      .st  = 0,
222   },
223   .update = update_raster_state
224};
225