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 "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
45
46 static GLuint
translate_fill(GLenum mode)47 translate_fill(GLenum mode)
48 {
49 switch (mode) {
50 case GL_POINT:
51 return PIPE_POLYGON_MODE_POINT;
52 case GL_LINE:
53 return PIPE_POLYGON_MODE_LINE;
54 case GL_FILL:
55 return PIPE_POLYGON_MODE_FILL;
56 case GL_FILL_RECTANGLE_NV:
57 return PIPE_POLYGON_MODE_FILL_RECTANGLE;
58 default:
59 assert(0);
60 return 0;
61 }
62 }
63
64 void
st_update_rasterizer(struct st_context * st)65 st_update_rasterizer(struct st_context *st)
66 {
67 struct gl_context *ctx = st->ctx;
68 struct pipe_rasterizer_state *raster = &st->state.rasterizer;
69 const struct gl_program *fragProg = ctx->FragmentProgram._Current;
70
71 memset(raster, 0, sizeof(*raster));
72
73 /* _NEW_POLYGON, _NEW_BUFFERS
74 */
75 {
76 raster->front_ccw = (ctx->Polygon.FrontFace == GL_CCW);
77
78 /* _NEW_TRANSFORM */
79 if (ctx->Transform.ClipOrigin == GL_UPPER_LEFT) {
80 raster->front_ccw ^= 1;
81 }
82
83 /*
84 * Gallium's surfaces are Y=0=TOP orientation. OpenGL is the
85 * opposite. Window system surfaces are Y=0=TOP. Mesa's FBOs
86 * must match OpenGL conventions so FBOs use Y=0=BOTTOM. In that
87 * case, we must invert Y and flip the notion of front vs. back.
88 */
89 if (st->state.fb_orientation == Y_0_BOTTOM) {
90 /* Drawing to an FBO. The viewport will be inverted. */
91 raster->front_ccw ^= 1;
92 }
93 }
94
95 /* _NEW_LIGHT_STATE */
96 raster->flatshade = !st->lower_flatshade &&
97 ctx->Light.ShadeModel == GL_FLAT;
98
99 raster->flatshade_first = ctx->Light.ProvokingVertex ==
100 GL_FIRST_VERTEX_CONVENTION_EXT;
101
102 /* _NEW_LIGHT_STATE | _NEW_PROGRAM */
103 if (!st->lower_two_sided_color)
104 raster->light_twoside = _mesa_vertex_program_two_side_enabled(ctx);
105
106 /*_NEW_LIGHT_STATE | _NEW_BUFFERS */
107 raster->clamp_vertex_color = !st->clamp_vert_color_in_shader &&
108 ctx->Light._ClampVertexColor;
109
110 /* _NEW_POLYGON
111 */
112 if (ctx->Polygon.CullFlag) {
113 switch (ctx->Polygon.CullFaceMode) {
114 case GL_FRONT:
115 raster->cull_face = PIPE_FACE_FRONT;
116 break;
117 case GL_BACK:
118 raster->cull_face = PIPE_FACE_BACK;
119 break;
120 case GL_FRONT_AND_BACK:
121 raster->cull_face = PIPE_FACE_FRONT_AND_BACK;
122 break;
123 }
124 }
125 else {
126 raster->cull_face = PIPE_FACE_NONE;
127 }
128
129 /* _NEW_POLYGON
130 */
131 {
132 if (ST_DEBUG & DEBUG_WIREFRAME) {
133 raster->fill_front = PIPE_POLYGON_MODE_LINE;
134 raster->fill_back = PIPE_POLYGON_MODE_LINE;
135 }
136 else {
137 raster->fill_front = translate_fill(ctx->Polygon.FrontMode);
138 raster->fill_back = translate_fill(ctx->Polygon.BackMode);
139 }
140
141 /* Simplify when culling is active:
142 */
143 if (raster->cull_face & PIPE_FACE_FRONT) {
144 raster->fill_front = raster->fill_back;
145 }
146
147 if (raster->cull_face & PIPE_FACE_BACK) {
148 raster->fill_back = raster->fill_front;
149 }
150 }
151
152 /* _NEW_POLYGON
153 */
154 if (ctx->Polygon.OffsetPoint ||
155 ctx->Polygon.OffsetLine ||
156 ctx->Polygon.OffsetFill) {
157 raster->offset_point = ctx->Polygon.OffsetPoint;
158 raster->offset_line = ctx->Polygon.OffsetLine;
159 raster->offset_tri = ctx->Polygon.OffsetFill;
160 raster->offset_units = ctx->Polygon.OffsetUnits;
161 raster->offset_scale = ctx->Polygon.OffsetFactor;
162 raster->offset_clamp = ctx->Polygon.OffsetClamp;
163 }
164
165 raster->poly_stipple_enable = ctx->Polygon.StippleFlag;
166
167 /* Multisampling disables point, line, and polygon smoothing.
168 *
169 * GL_ARB_multisample says:
170 *
171 * "If MULTISAMPLE_ARB is enabled, and SAMPLE_BUFFERS_ARB is a value of
172 * one, then points are rasterized using the following algorithm,
173 * regardless of whether point antialiasing (POINT_SMOOTH) is enabled"
174 *
175 * "If MULTISAMPLE_ARB is enabled, and SAMPLE_BUFFERS_ARB is a value of
176 * one, then lines are rasterized using the following algorithm,
177 * regardless of whether line antialiasing (LINE_SMOOTH) is enabled"
178 *
179 * "If MULTISAMPLE_ARB is enabled, and SAMPLE_BUFFERS_ARB is a value of
180 * one, then polygons are rasterized using the following algorithm,
181 * regardless of whether polygon antialiasing (POLYGON_SMOOTH) is
182 * enabled"
183 */
184
185 /* _NEW_MULTISAMPLE */
186 bool multisample = _mesa_is_multisample_enabled(ctx);
187 raster->multisample = multisample;
188
189 /* _NEW_POLYGON | _NEW_MULTISAMPLE */
190 raster->poly_smooth = !multisample && ctx->Polygon.SmoothFlag;
191
192 /* _NEW_POINT
193 */
194 raster->point_size = ctx->Point.Size;
195
196 /* _NEW_POINT | _NEW_MULTISAMPLE */
197 raster->point_smooth = !multisample && !ctx->Point.PointSprite &&
198 ctx->Point.SmoothFlag;
199
200 /* _NEW_POINT | _NEW_PROGRAM
201 */
202 if (ctx->Point.PointSprite) {
203 /* origin */
204 if ((ctx->Point.SpriteOrigin == GL_UPPER_LEFT) ^
205 (st->state.fb_orientation == Y_0_BOTTOM))
206 raster->sprite_coord_mode = PIPE_SPRITE_COORD_UPPER_LEFT;
207 else
208 raster->sprite_coord_mode = PIPE_SPRITE_COORD_LOWER_LEFT;
209
210 /* Coord replacement flags. If bit 'k' is set that means
211 * that we need to replace GENERIC[k] attrib with an automatically
212 * computed texture coord.
213 */
214 raster->sprite_coord_enable = ctx->Point.CoordReplace &
215 ((1u << MAX_TEXTURE_COORD_UNITS) - 1);
216 if (!st->needs_texcoord_semantic &&
217 fragProg->info.inputs_read & VARYING_BIT_PNTC) {
218 raster->sprite_coord_enable |=
219 1 << st_get_generic_varying_index(st, VARYING_SLOT_PNTC);
220 }
221
222 raster->point_quad_rasterization = 1;
223
224 raster->point_tri_clip = st->ctx->API == API_OPENGLES2;
225 }
226
227 /* ST_NEW_VERTEX_PROGRAM
228 */
229 raster->point_size_per_vertex = st_point_size_per_vertex(ctx);
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 | _NEW_MULTISAMPLE
238 */
239 if (!multisample && ctx->Line.SmoothFlag) {
240 raster->line_smooth = 1;
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_rectangular = multisample || ctx->Line.SmoothFlag;
252
253 /* When the pattern is all 1's, it means line stippling is disabled */
254 raster->line_stipple_enable = ctx->Line.StippleFlag && ctx->Line.StipplePattern != 0xffff;
255 raster->line_stipple_pattern = ctx->Line.StipplePattern;
256 /* GL stipple factor is in [1,256], remap to [0, 255] here */
257 raster->line_stipple_factor = ctx->Line.StippleFactor - 1;
258
259 /* _NEW_MULTISAMPLE | _NEW_BUFFERS */
260 raster->force_persample_interp =
261 !st->force_persample_in_shader &&
262 raster->multisample &&
263 ctx->Multisample.SampleShading &&
264 ctx->Multisample.MinSampleShadingValue *
265 _mesa_geometric_samples(ctx->DrawBuffer) > 1;
266
267 /* _NEW_SCISSOR */
268 raster->scissor = !!ctx->Scissor.EnableFlags;
269
270 /* gl_driver_flags::NewFragClamp */
271 raster->clamp_fragment_color = !st->clamp_frag_color_in_shader &&
272 ctx->Color._ClampFragmentColor;
273
274 raster->half_pixel_center = 1;
275 if (st->state.fb_orientation == Y_0_TOP)
276 raster->bottom_edge_rule = 1;
277
278 /* _NEW_TRANSFORM */
279 if (ctx->Transform.ClipOrigin == GL_UPPER_LEFT)
280 raster->bottom_edge_rule ^= 1;
281
282 /* ST_NEW_RASTERIZER */
283 raster->rasterizer_discard = ctx->RasterDiscard;
284 if (ctx->TileRasterOrderFixed) {
285 raster->tile_raster_order_fixed = true;
286 raster->tile_raster_order_increasing_x = ctx->TileRasterOrderIncreasingX;
287 raster->tile_raster_order_increasing_y = ctx->TileRasterOrderIncreasingY;
288 }
289
290 if (st->edgeflag_culls_prims) {
291 /* All edge flags are FALSE. Cull the affected faces. */
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 /* _NEW_TRANSFORM */
299 raster->depth_clip_near = st->clamp_frag_depth_in_shader ||
300 !ctx->Transform.DepthClampNear;
301 raster->depth_clip_far = st->clamp_frag_depth_in_shader ||
302 !ctx->Transform.DepthClampFar;
303 raster->depth_clamp = !raster->depth_clip_far;
304 raster->clip_plane_enable = ctx->Transform.ClipPlanesEnabled;
305 raster->clip_halfz = (ctx->Transform.ClipDepthMode == GL_ZERO_TO_ONE);
306
307 /* ST_NEW_RASTERIZER */
308 if (ctx->ConservativeRasterization) {
309 if (ctx->ConservativeRasterMode == GL_CONSERVATIVE_RASTER_MODE_POST_SNAP_NV)
310 raster->conservative_raster_mode = PIPE_CONSERVATIVE_RASTER_POST_SNAP;
311 else
312 raster->conservative_raster_mode = PIPE_CONSERVATIVE_RASTER_PRE_SNAP;
313 } else if (ctx->IntelConservativeRasterization) {
314 raster->conservative_raster_mode = PIPE_CONSERVATIVE_RASTER_POST_SNAP;
315 } else {
316 raster->conservative_raster_mode = PIPE_CONSERVATIVE_RASTER_OFF;
317 }
318
319 raster->conservative_raster_dilate = ctx->ConservativeRasterDilate;
320
321 raster->subpixel_precision_x = ctx->SubpixelPrecisionBias[0];
322 raster->subpixel_precision_y = ctx->SubpixelPrecisionBias[1];
323
324 cso_set_rasterizer(st->cso_context, raster);
325 }
326