st_atom_rasterizer.c revision 03b78ceb50b97611bcaa2d2354ff5b505306b0a1 
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
56
57
58static void update_raster_state( struct st_context *st )
59{
60   struct gl_context *ctx = st->ctx;
61   struct pipe_rasterizer_state *raster = &st->state.rasterizer;
62   const struct gl_vertex_program *vertProg = ctx->VertexProgram._Current;
63   const struct gl_fragment_program *fragProg = ctx->FragmentProgram._Current;
64   uint i;
65
66   memset(raster, 0, sizeof(*raster));
67
68   /* _NEW_POLYGON, _NEW_BUFFERS
69    */
70   {
71      raster->front_ccw = (ctx->Polygon.FrontFace == GL_CCW);
72
73      /*
74       * Gallium's surfaces are Y=0=TOP orientation.  OpenGL is the
75       * opposite.  Window system surfaces are Y=0=TOP.  Mesa's FBOs
76       * must match OpenGL conventions so FBOs use Y=0=BOTTOM.  In that
77       * case, we must invert Y and flip the notion of front vs. back.
78       */
79      if (st_fb_orientation(ctx->DrawBuffer) == Y_0_BOTTOM) {
80         /* Drawing to an FBO.  The viewport will be inverted. */
81         raster->front_ccw ^= 1;
82      }
83   }
84
85   /* _NEW_LIGHT
86    */
87   if (ctx->Light.ShadeModel == GL_FLAT)
88      raster->flatshade = 1;
89
90   if (ctx->Light.ProvokingVertex == GL_FIRST_VERTEX_CONVENTION_EXT)
91      raster->flatshade_first = 1;
92
93   /* _NEW_LIGHT | _NEW_PROGRAM */
94   raster->light_twoside = ctx->VertexProgram._TwoSideEnabled;
95
96   /*_NEW_LIGHT | _NEW_BUFFERS */
97   raster->clamp_vertex_color = !st->clamp_vert_color_in_shader &&
98                                ctx->Light._ClampVertexColor;
99
100   /* _NEW_POLYGON
101    */
102   if (ctx->Polygon.CullFlag) {
103      switch (ctx->Polygon.CullFaceMode) {
104      case GL_FRONT:
105	 raster->cull_face = PIPE_FACE_FRONT;
106         break;
107      case GL_BACK:
108	 raster->cull_face = PIPE_FACE_BACK;
109         break;
110      case GL_FRONT_AND_BACK:
111	 raster->cull_face = PIPE_FACE_FRONT_AND_BACK;
112         break;
113      }
114   }
115   else {
116      raster->cull_face = PIPE_FACE_NONE;
117   }
118
119   /* _NEW_POLYGON
120    */
121   {
122      raster->fill_front = translate_fill( ctx->Polygon.FrontMode );
123      raster->fill_back = translate_fill( ctx->Polygon.BackMode );
124
125      /* Simplify when culling is active:
126       */
127      if (raster->cull_face & PIPE_FACE_FRONT) {
128	 raster->fill_front = raster->fill_back;
129      }
130
131      if (raster->cull_face & PIPE_FACE_BACK) {
132	 raster->fill_back = raster->fill_front;
133      }
134   }
135
136   /* _NEW_POLYGON
137    */
138   if (ctx->Polygon.OffsetUnits != 0.0 ||
139       ctx->Polygon.OffsetFactor != 0.0) {
140      raster->offset_point = ctx->Polygon.OffsetPoint;
141      raster->offset_line = ctx->Polygon.OffsetLine;
142      raster->offset_tri = ctx->Polygon.OffsetFill;
143   }
144
145   if (ctx->Polygon.OffsetPoint ||
146       ctx->Polygon.OffsetLine ||
147       ctx->Polygon.OffsetFill) {
148      raster->offset_units = ctx->Polygon.OffsetUnits;
149      raster->offset_scale = ctx->Polygon.OffsetFactor;
150   }
151
152   if (ctx->Polygon.SmoothFlag)
153      raster->poly_smooth = 1;
154
155   if (ctx->Polygon.StippleFlag)
156      raster->poly_stipple_enable = 1;
157
158   /* _NEW_POINT
159    */
160   raster->point_size = ctx->Point.Size;
161
162   if (!ctx->Point.PointSprite && ctx->Point.SmoothFlag)
163      raster->point_smooth = 1;
164
165   /* _NEW_POINT | _NEW_PROGRAM
166    */
167   if (ctx->Point.PointSprite) {
168      /* origin */
169      if ((ctx->Point.SpriteOrigin == GL_UPPER_LEFT) ^
170          (st_fb_orientation(ctx->DrawBuffer) == Y_0_BOTTOM))
171         raster->sprite_coord_mode = PIPE_SPRITE_COORD_UPPER_LEFT;
172      else
173         raster->sprite_coord_mode = PIPE_SPRITE_COORD_LOWER_LEFT;
174
175      /* Coord replacement flags.  If bit 'k' is set that means
176       * that we need to replace GENERIC[k] attrib with an automatically
177       * computed texture coord.
178       */
179      for (i = 0; i < MAX_TEXTURE_COORD_UNITS; i++) {
180         if (ctx->Point.CoordReplace[i]) {
181            raster->sprite_coord_enable |= 1 << i;
182         }
183      }
184      if (fragProg->Base.InputsRead & FRAG_BIT_PNTC) {
185         raster->sprite_coord_enable |=
186            1 << (FRAG_ATTRIB_PNTC - FRAG_ATTRIB_TEX0);
187      }
188
189      raster->point_quad_rasterization = 1;
190   }
191
192   /* ST_NEW_VERTEX_PROGRAM
193    */
194   if (vertProg) {
195      if (vertProg->Base.Id == 0) {
196         if (vertProg->Base.OutputsWritten & BITFIELD64_BIT(VERT_RESULT_PSIZ)) {
197            /* generated program which emits point size */
198            raster->point_size_per_vertex = TRUE;
199         }
200      }
201      else if (ctx->VertexProgram.PointSizeEnabled) {
202         /* user-defined program and GL_VERTEX_PROGRAM_POINT_SIZE set */
203         raster->point_size_per_vertex = ctx->VertexProgram.PointSizeEnabled;
204      }
205   }
206   if (!raster->point_size_per_vertex) {
207      /* clamp size now */
208      raster->point_size = CLAMP(ctx->Point.Size,
209                                 ctx->Point.MinSize,
210                                 ctx->Point.MaxSize);
211   }
212
213   /* _NEW_LINE
214    */
215   raster->line_smooth = ctx->Line.SmoothFlag;
216   if (ctx->Line.SmoothFlag) {
217      raster->line_width = CLAMP(ctx->Line.Width,
218                                ctx->Const.MinLineWidthAA,
219                                ctx->Const.MaxLineWidthAA);
220   }
221   else {
222      raster->line_width = CLAMP(ctx->Line.Width,
223                                ctx->Const.MinLineWidth,
224                                ctx->Const.MaxLineWidth);
225   }
226
227   raster->line_stipple_enable = ctx->Line.StippleFlag;
228   raster->line_stipple_pattern = ctx->Line.StipplePattern;
229   /* GL stipple factor is in [1,256], remap to [0, 255] here */
230   raster->line_stipple_factor = ctx->Line.StippleFactor - 1;
231
232   /* _NEW_MULTISAMPLE */
233   if (ctx->Multisample._Enabled || st->force_msaa)
234      raster->multisample = 1;
235
236   /* _NEW_SCISSOR */
237   if (ctx->Scissor.Enabled)
238      raster->scissor = 1;
239
240   /* _NEW_FRAG_CLAMP */
241   raster->clamp_fragment_color = !st->clamp_frag_color_in_shader &&
242                                  ctx->Color._ClampFragmentColor &&
243                                  !ctx->DrawBuffer->_IntegerColor;
244   raster->gl_rasterization_rules = 1;
245
246   /* _NEW_RASTERIZER_DISCARD */
247   raster->rasterizer_discard = ctx->RasterDiscard;
248
249   /* _NEW_TRANSFORM */
250   raster->depth_clip = ctx->Transform.DepthClamp == GL_FALSE;
251   raster->clip_plane_enable = ctx->Transform.ClipPlanesEnabled;
252
253   cso_set_rasterizer(st->cso_context, raster);
254}
255
256const struct st_tracked_state st_update_rasterizer = {
257   "st_update_rasterizer",    /* name */
258   {
259      (_NEW_BUFFERS |
260       _NEW_LIGHT |
261       _NEW_LINE |
262       _NEW_MULTISAMPLE |
263       _NEW_POINT |
264       _NEW_POLYGON |
265       _NEW_PROGRAM |
266       _NEW_SCISSOR |
267       _NEW_FRAG_CLAMP |
268       _NEW_RASTERIZER_DISCARD |
269       _NEW_TRANSFORM),      /* mesa state dependencies*/
270      ST_NEW_VERTEX_PROGRAM,  /* state tracker dependencies */
271   },
272   update_raster_state     /* update function */
273};
274