1/**************************************************************************
2 *
3 * Copyright 2007 VMware, Inc.
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 VMWARE 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 <keithw@vmware.com>
31  */
32
33#include "main/macros.h"
34#include "main/framebuffer.h"
35#include "st_context.h"
36#include "st_atom.h"
37#include "st_debug.h"
38#include "st_program.h"
39#include "pipe/p_context.h"
40#include "pipe/p_defines.h"
41#include "cso_cache/cso_context.h"
42
43
44static GLuint translate_fill( GLenum mode )
45{
46   switch (mode) {
47   case GL_POINT:
48      return PIPE_POLYGON_MODE_POINT;
49   case GL_LINE:
50      return PIPE_POLYGON_MODE_LINE;
51   case GL_FILL:
52      return PIPE_POLYGON_MODE_FILL;
53   default:
54      assert(0);
55      return 0;
56   }
57}
58
59
60
61static void update_raster_state( struct st_context *st )
62{
63   struct gl_context *ctx = st->ctx;
64   struct pipe_rasterizer_state *raster = &st->state.rasterizer;
65   const struct gl_program *vertProg = ctx->VertexProgram._Current;
66   const struct gl_program *fragProg = ctx->FragmentProgram._Current;
67
68   memset(raster, 0, sizeof(*raster));
69
70   /* _NEW_POLYGON, _NEW_BUFFERS
71    */
72   {
73      raster->front_ccw = (ctx->Polygon.FrontFace == GL_CCW);
74
75      /* _NEW_TRANSFORM */
76      if (ctx->Transform.ClipOrigin == GL_UPPER_LEFT) {
77         raster->front_ccw ^= 1;
78      }
79
80      /*
81       * Gallium's surfaces are Y=0=TOP orientation.  OpenGL is the
82       * opposite.  Window system surfaces are Y=0=TOP.  Mesa's FBOs
83       * must match OpenGL conventions so FBOs use Y=0=BOTTOM.  In that
84       * case, we must invert Y and flip the notion of front vs. back.
85       */
86      if (st_fb_orientation(ctx->DrawBuffer) == Y_0_BOTTOM) {
87         /* Drawing to an FBO.  The viewport will be inverted. */
88         raster->front_ccw ^= 1;
89      }
90   }
91
92   /* _NEW_LIGHT
93    */
94   raster->flatshade = ctx->Light.ShadeModel == GL_FLAT;
95
96   raster->flatshade_first = ctx->Light.ProvokingVertex ==
97                             GL_FIRST_VERTEX_CONVENTION_EXT;
98
99   /* _NEW_LIGHT | _NEW_PROGRAM */
100   raster->light_twoside = ctx->VertexProgram._TwoSideEnabled;
101
102   /*_NEW_LIGHT | _NEW_BUFFERS */
103   raster->clamp_vertex_color = !st->clamp_vert_color_in_shader &&
104                                ctx->Light._ClampVertexColor;
105
106   /* _NEW_POLYGON
107    */
108   if (ctx->Polygon.CullFlag) {
109      switch (ctx->Polygon.CullFaceMode) {
110      case GL_FRONT:
111	 raster->cull_face = PIPE_FACE_FRONT;
112         break;
113      case GL_BACK:
114	 raster->cull_face = PIPE_FACE_BACK;
115         break;
116      case GL_FRONT_AND_BACK:
117	 raster->cull_face = PIPE_FACE_FRONT_AND_BACK;
118         break;
119      }
120   }
121   else {
122      raster->cull_face = PIPE_FACE_NONE;
123   }
124
125   /* _NEW_POLYGON
126    */
127   {
128      if (ST_DEBUG & DEBUG_WIREFRAME) {
129         raster->fill_front = PIPE_POLYGON_MODE_LINE;
130         raster->fill_back = PIPE_POLYGON_MODE_LINE;
131      }
132      else {
133         raster->fill_front = translate_fill( ctx->Polygon.FrontMode );
134         raster->fill_back = translate_fill( ctx->Polygon.BackMode );
135      }
136
137      /* Simplify when culling is active:
138       */
139      if (raster->cull_face & PIPE_FACE_FRONT) {
140	 raster->fill_front = raster->fill_back;
141      }
142
143      if (raster->cull_face & PIPE_FACE_BACK) {
144	 raster->fill_back = raster->fill_front;
145      }
146   }
147
148   /* _NEW_POLYGON
149    */
150   if (ctx->Polygon.OffsetPoint ||
151       ctx->Polygon.OffsetLine ||
152       ctx->Polygon.OffsetFill) {
153      raster->offset_point = ctx->Polygon.OffsetPoint;
154      raster->offset_line = ctx->Polygon.OffsetLine;
155      raster->offset_tri = ctx->Polygon.OffsetFill;
156      raster->offset_units = ctx->Polygon.OffsetUnits;
157      raster->offset_scale = ctx->Polygon.OffsetFactor;
158      raster->offset_clamp = ctx->Polygon.OffsetClamp;
159   }
160
161   raster->poly_smooth = ctx->Polygon.SmoothFlag;
162   raster->poly_stipple_enable = ctx->Polygon.StippleFlag;
163
164   /* _NEW_POINT
165    */
166   raster->point_size = ctx->Point.Size;
167   raster->point_smooth = !ctx->Point.PointSprite && ctx->Point.SmoothFlag;
168
169   /* _NEW_POINT | _NEW_PROGRAM
170    */
171   if (ctx->Point.PointSprite) {
172      /* origin */
173      if ((ctx->Point.SpriteOrigin == GL_UPPER_LEFT) ^
174          (st_fb_orientation(ctx->DrawBuffer) == Y_0_BOTTOM))
175         raster->sprite_coord_mode = PIPE_SPRITE_COORD_UPPER_LEFT;
176      else
177         raster->sprite_coord_mode = PIPE_SPRITE_COORD_LOWER_LEFT;
178
179      /* Coord replacement flags.  If bit 'k' is set that means
180       * that we need to replace GENERIC[k] attrib with an automatically
181       * computed texture coord.
182       */
183      raster->sprite_coord_enable = ctx->Point.CoordReplace &
184         ((1u << MAX_TEXTURE_COORD_UNITS) - 1);
185      if (!st->needs_texcoord_semantic &&
186          fragProg->info.inputs_read & VARYING_BIT_PNTC) {
187         raster->sprite_coord_enable |=
188            1 << st_get_generic_varying_index(st, VARYING_SLOT_PNTC);
189      }
190
191      raster->point_quad_rasterization = 1;
192   }
193
194   /* ST_NEW_VERTEX_PROGRAM
195    */
196   if (vertProg) {
197      if (vertProg->Id == 0) {
198         if (vertProg->info.outputs_written &
199             BITFIELD64_BIT(VARYING_SLOT_PSIZ)) {
200            /* generated program which emits point size */
201            raster->point_size_per_vertex = TRUE;
202         }
203      }
204      else if (ctx->API != API_OPENGLES2) {
205         /* PointSizeEnabled is always set in ES2 contexts */
206         raster->point_size_per_vertex = ctx->VertexProgram.PointSizeEnabled;
207      }
208      else {
209         /* ST_NEW_TESSEVAL_PROGRAM | ST_NEW_GEOMETRY_PROGRAM */
210         /* We have to check the last bound stage and see if it writes psize */
211         struct gl_program *last = NULL;
212         if (ctx->GeometryProgram._Current)
213            last = ctx->GeometryProgram._Current;
214         else if (ctx->TessEvalProgram._Current)
215            last = ctx->TessEvalProgram._Current;
216         else if (ctx->VertexProgram._Current)
217            last = ctx->VertexProgram._Current;
218         if (last)
219            raster->point_size_per_vertex =
220               !!(last->info.outputs_written &
221                  BITFIELD64_BIT(VARYING_SLOT_PSIZ));
222      }
223   }
224   if (!raster->point_size_per_vertex) {
225      /* clamp size now */
226      raster->point_size = CLAMP(ctx->Point.Size,
227                                 ctx->Point.MinSize,
228                                 ctx->Point.MaxSize);
229   }
230
231   /* _NEW_LINE
232    */
233   raster->line_smooth = ctx->Line.SmoothFlag;
234   if (ctx->Line.SmoothFlag) {
235      raster->line_width = CLAMP(ctx->Line.Width,
236                                 ctx->Const.MinLineWidthAA,
237                                 ctx->Const.MaxLineWidthAA);
238   }
239   else {
240      raster->line_width = CLAMP(ctx->Line.Width,
241                                 ctx->Const.MinLineWidth,
242                                 ctx->Const.MaxLineWidth);
243   }
244
245   raster->line_stipple_enable = ctx->Line.StippleFlag;
246   raster->line_stipple_pattern = ctx->Line.StipplePattern;
247   /* GL stipple factor is in [1,256], remap to [0, 255] here */
248   raster->line_stipple_factor = ctx->Line.StippleFactor - 1;
249
250   /* _NEW_MULTISAMPLE */
251   raster->multisample = _mesa_is_multisample_enabled(ctx);
252
253   /* _NEW_MULTISAMPLE | _NEW_BUFFERS */
254   raster->force_persample_interp =
255         !st->force_persample_in_shader &&
256         raster->multisample &&
257         ctx->Multisample.SampleShading &&
258         ctx->Multisample.MinSampleShadingValue *
259         _mesa_geometric_samples(ctx->DrawBuffer) > 1;
260
261   /* _NEW_SCISSOR */
262   raster->scissor = ctx->Scissor.EnableFlags;
263
264   /* _NEW_FRAG_CLAMP */
265   raster->clamp_fragment_color = !st->clamp_frag_color_in_shader &&
266                                  ctx->Color._ClampFragmentColor;
267
268   raster->half_pixel_center = 1;
269   if (st_fb_orientation(ctx->DrawBuffer) == Y_0_TOP)
270      raster->bottom_edge_rule = 1;
271   /* _NEW_TRANSFORM */
272   if (ctx->Transform.ClipOrigin == GL_UPPER_LEFT)
273      raster->bottom_edge_rule ^= 1;
274
275   /* ST_NEW_RASTERIZER */
276   raster->rasterizer_discard = ctx->RasterDiscard;
277
278   if (st->edgeflag_culls_prims) {
279      /* All edge flags are FALSE. Cull the affected faces. */
280      if (raster->fill_front != PIPE_POLYGON_MODE_FILL)
281         raster->cull_face |= PIPE_FACE_FRONT;
282      if (raster->fill_back != PIPE_POLYGON_MODE_FILL)
283         raster->cull_face |= PIPE_FACE_BACK;
284   }
285
286   /* _NEW_TRANSFORM */
287   raster->depth_clip = !ctx->Transform.DepthClamp;
288   raster->clip_plane_enable = ctx->Transform.ClipPlanesEnabled;
289   raster->clip_halfz = (ctx->Transform.ClipDepthMode == GL_ZERO_TO_ONE);
290
291   cso_set_rasterizer(st->cso_context, raster);
292}
293
294const struct st_tracked_state st_update_rasterizer = {
295   update_raster_state     /* update function */
296};
297