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 <[email protected]>
31 */
32
33 #include "main/macros.h"
34 #include "main/framebuffer.h"
35 #include "main/state.h"
36 #include "st_context.h"
37 #include "st_atom.h"
38 #include "st_debug.h"
39 #include "st_program.h"
40 #include "st_util.h"
41 #include "pipe/p_context.h"
42 #include "pipe/p_defines.h"
43 #include "cso_cache/cso_context.h"
44 #include "main/context.h"
45
46
47 static GLuint
translate_fill(GLenum mode)48 translate_fill(GLenum mode)
49 {
50 switch (mode) {
51 case GL_POINT:
52 return PIPE_POLYGON_MODE_POINT;
53 case GL_LINE:
54 return PIPE_POLYGON_MODE_LINE;
55 case GL_FILL:
56 return PIPE_POLYGON_MODE_FILL;
57 case GL_FILL_RECTANGLE_NV:
58 return PIPE_POLYGON_MODE_FILL_RECTANGLE;
59 default:
60 assert(0);
61 return 0;
62 }
63 }
64
65 void
st_update_rasterizer(struct st_context * st)66 st_update_rasterizer(struct st_context *st)
67 {
68 struct gl_context *ctx = st->ctx;
69 struct pipe_rasterizer_state *raster = &st->state.rasterizer;
70 const struct gl_program *fragProg = ctx->FragmentProgram._Current;
71
72 memset(raster, 0, sizeof(*raster));
73
74 /* _NEW_POLYGON, _NEW_BUFFERS
75 */
76 {
77 raster->front_ccw = (ctx->Polygon.FrontFace == GL_CCW);
78
79 /* _NEW_TRANSFORM */
80 if (ctx->Transform.ClipOrigin == GL_UPPER_LEFT) {
81 raster->front_ccw ^= 1;
82 }
83
84 /*
85 * Gallium's surfaces are Y=0=TOP orientation. OpenGL is the
86 * opposite. Window system surfaces are Y=0=TOP. Mesa's FBOs
87 * must match OpenGL conventions so FBOs use Y=0=BOTTOM. In that
88 * case, we must invert Y and flip the notion of front vs. back.
89 */
90 if (st->state.fb_orientation == Y_0_BOTTOM) {
91 /* Drawing to an FBO. The viewport will be inverted. */
92 raster->front_ccw ^= 1;
93 }
94 }
95
96 /* _NEW_LIGHT_STATE */
97 raster->flatshade = !st->lower_flatshade &&
98 ctx->Light.ShadeModel == GL_FLAT;
99
100 raster->flatshade_first = ctx->Light.ProvokingVertex ==
101 GL_FIRST_VERTEX_CONVENTION_EXT;
102
103 /* _NEW_LIGHT_STATE | _NEW_PROGRAM */
104 if (!st->lower_two_sided_color)
105 raster->light_twoside = _mesa_vertex_program_two_side_enabled(ctx);
106
107 /*_NEW_LIGHT_STATE | _NEW_BUFFERS */
108 raster->clamp_vertex_color = !st->clamp_vert_color_in_shader &&
109 ctx->Light._ClampVertexColor;
110
111 /* _NEW_POLYGON
112 */
113 if (ctx->Polygon.CullFlag) {
114 switch (ctx->Polygon.CullFaceMode) {
115 case GL_FRONT:
116 raster->cull_face = PIPE_FACE_FRONT;
117 break;
118 case GL_BACK:
119 raster->cull_face = PIPE_FACE_BACK;
120 break;
121 case GL_FRONT_AND_BACK:
122 raster->cull_face = PIPE_FACE_FRONT_AND_BACK;
123 break;
124 }
125 }
126 else {
127 raster->cull_face = PIPE_FACE_NONE;
128 }
129
130 /* _NEW_POLYGON
131 */
132 {
133 if (ST_DEBUG & DEBUG_WIREFRAME) {
134 raster->fill_front = PIPE_POLYGON_MODE_LINE;
135 raster->fill_back = PIPE_POLYGON_MODE_LINE;
136 }
137 else {
138 raster->fill_front = translate_fill(ctx->Polygon.FrontMode);
139 raster->fill_back = translate_fill(ctx->Polygon.BackMode);
140 }
141
142 /* Simplify when culling is active:
143 */
144 if (raster->cull_face & PIPE_FACE_FRONT) {
145 raster->fill_front = raster->fill_back;
146 }
147
148 if (raster->cull_face & PIPE_FACE_BACK) {
149 raster->fill_back = raster->fill_front;
150 }
151 }
152
153 /* _NEW_POLYGON
154 */
155 if (ctx->Polygon.OffsetPoint ||
156 ctx->Polygon.OffsetLine ||
157 ctx->Polygon.OffsetFill) {
158 raster->offset_point = ctx->Polygon.OffsetPoint;
159 raster->offset_line = ctx->Polygon.OffsetLine;
160 raster->offset_tri = ctx->Polygon.OffsetFill;
161 raster->offset_units = ctx->Polygon.OffsetUnits;
162 raster->offset_scale = ctx->Polygon.OffsetFactor;
163 raster->offset_clamp = ctx->Polygon.OffsetClamp;
164 }
165
166 raster->poly_stipple_enable = ctx->Polygon.StippleFlag;
167
168 /* Multisampling disables point, line, and polygon smoothing.
169 *
170 * GL_ARB_multisample says:
171 *
172 * "If MULTISAMPLE_ARB is enabled, and SAMPLE_BUFFERS_ARB is a value of
173 * one, then points are rasterized using the following algorithm,
174 * regardless of whether point antialiasing (POINT_SMOOTH) is enabled"
175 *
176 * "If MULTISAMPLE_ARB is enabled, and SAMPLE_BUFFERS_ARB is a value of
177 * one, then lines are rasterized using the following algorithm,
178 * regardless of whether line antialiasing (LINE_SMOOTH) is enabled"
179 *
180 * "If MULTISAMPLE_ARB is enabled, and SAMPLE_BUFFERS_ARB is a value of
181 * one, then polygons are rasterized using the following algorithm,
182 * regardless of whether polygon antialiasing (POLYGON_SMOOTH) is
183 * enabled"
184 */
185
186 /* _NEW_MULTISAMPLE */
187 bool multisample = _mesa_is_multisample_enabled(ctx);
188 raster->multisample = multisample;
189
190 /* _NEW_POLYGON | _NEW_MULTISAMPLE */
191 raster->poly_smooth = !multisample && ctx->Polygon.SmoothFlag;
192
193 /* _NEW_POINT
194 */
195 raster->point_size = ctx->Point.Size;
196
197 /* _NEW_POINT | _NEW_MULTISAMPLE */
198 raster->point_smooth = !multisample && !ctx->Point.PointSprite &&
199 ctx->Point.SmoothFlag;
200
201 /* _NEW_POINT | _NEW_PROGRAM
202 */
203 if (ctx->Point.PointSprite) {
204 /* origin */
205 if ((ctx->Point.SpriteOrigin == GL_UPPER_LEFT) ^
206 (st->state.fb_orientation == Y_0_BOTTOM))
207 raster->sprite_coord_mode = PIPE_SPRITE_COORD_UPPER_LEFT;
208 else
209 raster->sprite_coord_mode = PIPE_SPRITE_COORD_LOWER_LEFT;
210
211 /* Coord replacement flags. If bit 'k' is set that means
212 * that we need to replace GENERIC[k] attrib with an automatically
213 * computed texture coord.
214 */
215 raster->sprite_coord_enable = ctx->Point.CoordReplace &
216 ((1u << MAX_TEXTURE_COORD_UNITS) - 1);
217 if (!st->needs_texcoord_semantic &&
218 fragProg->info.inputs_read & VARYING_BIT_PNTC) {
219 raster->sprite_coord_enable |=
220 1 << st_get_generic_varying_index(st, VARYING_SLOT_PNTC);
221 }
222
223 raster->point_quad_rasterization = 1;
224
225 raster->point_line_tri_clip = _mesa_is_gles2(st->ctx);
226 }
227
228 /* ST_NEW_VERTEX_PROGRAM
229 */
230 raster->point_size_per_vertex = st_point_size_per_vertex(ctx);
231 if (!raster->point_size_per_vertex) {
232 /* clamp size now */
233 raster->point_size = CLAMP(ctx->Point.Size,
234 ctx->Point.MinSize,
235 ctx->Point.MaxSize);
236 }
237
238 /* _NEW_LINE | _NEW_MULTISAMPLE
239 */
240 if (!multisample && ctx->Line.SmoothFlag) {
241 raster->line_smooth = 1;
242 raster->line_width = CLAMP(ctx->Line.Width,
243 ctx->Const.MinLineWidthAA,
244 ctx->Const.MaxLineWidthAA);
245 }
246 else {
247 raster->line_width = CLAMP(ctx->Line.Width,
248 ctx->Const.MinLineWidth,
249 ctx->Const.MaxLineWidth);
250 }
251
252 raster->line_rectangular = multisample || ctx->Line.SmoothFlag;
253
254 /* When the pattern is all 1's, it means line stippling is disabled */
255 raster->line_stipple_enable = ctx->Line.StippleFlag && ctx->Line.StipplePattern != 0xffff;
256 raster->line_stipple_pattern = ctx->Line.StipplePattern;
257 /* GL stipple factor is in [1,256], remap to [0, 255] here */
258 raster->line_stipple_factor = ctx->Line.StippleFactor - 1;
259
260 /* _NEW_MULTISAMPLE | _NEW_BUFFERS */
261 raster->force_persample_interp =
262 !st->force_persample_in_shader &&
263 raster->multisample &&
264 ctx->Multisample.SampleShading &&
265 ctx->Multisample.MinSampleShadingValue *
266 _mesa_geometric_samples(ctx->DrawBuffer) > 1;
267
268 /* _NEW_SCISSOR */
269 raster->scissor = !!ctx->Scissor.EnableFlags;
270
271 /* gl_driver_flags::NewFragClamp */
272 raster->clamp_fragment_color = !st->clamp_frag_color_in_shader &&
273 ctx->Color._ClampFragmentColor;
274
275 raster->half_pixel_center = 1;
276 if (st->state.fb_orientation == Y_0_TOP)
277 raster->bottom_edge_rule = 1;
278
279 /* _NEW_TRANSFORM */
280 if (ctx->Transform.ClipOrigin == GL_UPPER_LEFT)
281 raster->bottom_edge_rule ^= 1;
282
283 /* ST_NEW_RASTERIZER */
284 raster->rasterizer_discard = ctx->RasterDiscard;
285 if (ctx->TileRasterOrderFixed) {
286 raster->tile_raster_order_fixed = true;
287 raster->tile_raster_order_increasing_x = ctx->TileRasterOrderIncreasingX;
288 raster->tile_raster_order_increasing_y = ctx->TileRasterOrderIncreasingY;
289 }
290
291 if (ctx->Array._PolygonModeAlwaysCulls) {
292 if (raster->fill_front != PIPE_POLYGON_MODE_FILL)
293 raster->cull_face |= PIPE_FACE_FRONT;
294 if (raster->fill_back != PIPE_POLYGON_MODE_FILL)
295 raster->cull_face |= PIPE_FACE_BACK;
296 }
297
298 /* Disable two-sided colors if back faces are culled. */
299 if (raster->cull_face & PIPE_FACE_BACK)
300 raster->light_twoside = 0;
301
302 /* _NEW_TRANSFORM */
303 raster->depth_clip_near = !ctx->Transform.DepthClampNear;
304 raster->depth_clip_far = !ctx->Transform.DepthClampFar;
305 raster->depth_clamp = !raster->depth_clip_far;
306 /* this should be different for GL vs GLES but without NV_depth_buffer_float
307 it doesn't matter, and likely virgl would need fixes to deal with it. */
308 raster->unclamped_fragment_depth_values = false;
309 raster->clip_plane_enable = ctx->Transform.ClipPlanesEnabled;
310 raster->clip_halfz = (ctx->Transform.ClipDepthMode == GL_ZERO_TO_ONE);
311
312 /* ST_NEW_RASTERIZER */
313 if (ctx->ConservativeRasterization) {
314 if (ctx->ConservativeRasterMode == GL_CONSERVATIVE_RASTER_MODE_POST_SNAP_NV)
315 raster->conservative_raster_mode = PIPE_CONSERVATIVE_RASTER_POST_SNAP;
316 else
317 raster->conservative_raster_mode = PIPE_CONSERVATIVE_RASTER_PRE_SNAP;
318 } else if (ctx->IntelConservativeRasterization) {
319 raster->conservative_raster_mode = PIPE_CONSERVATIVE_RASTER_POST_SNAP;
320 } else {
321 raster->conservative_raster_mode = PIPE_CONSERVATIVE_RASTER_OFF;
322 }
323
324 raster->conservative_raster_dilate = ctx->ConservativeRasterDilate;
325
326 raster->subpixel_precision_x = ctx->SubpixelPrecisionBias[0];
327 raster->subpixel_precision_y = ctx->SubpixelPrecisionBias[1];
328
329 cso_set_rasterizer(st->cso_context, raster);
330 }
331