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 "pipe/p_context.h"
41 #include "pipe/p_defines.h"
42 #include "cso_cache/cso_context.h"
43
44
45 static GLuint
translate_fill(GLenum mode)46 translate_fill(GLenum mode)
47 {
48 switch (mode) {
49 case GL_POINT:
50 return PIPE_POLYGON_MODE_POINT;
51 case GL_LINE:
52 return PIPE_POLYGON_MODE_LINE;
53 case GL_FILL:
54 return PIPE_POLYGON_MODE_FILL;
55 case GL_FILL_RECTANGLE_NV:
56 return PIPE_POLYGON_MODE_FILL_RECTANGLE;
57 default:
58 assert(0);
59 return 0;
60 }
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 *vertProg = ctx->VertexProgram._Current;
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
97 */
98 raster->flatshade = ctx->Light.ShadeModel == GL_FLAT;
99
100 raster->flatshade_first = ctx->Light.ProvokingVertex ==
101 GL_FIRST_VERTEX_CONVENTION_EXT;
102
103 /* _NEW_LIGHT | _NEW_PROGRAM */
104 raster->light_twoside = _mesa_vertex_program_two_side_enabled(ctx);
105
106 /*_NEW_LIGHT | _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_smooth = ctx->Polygon.SmoothFlag;
166 raster->poly_stipple_enable = ctx->Polygon.StippleFlag;
167
168 /* _NEW_POINT
169 */
170 raster->point_size = ctx->Point.Size;
171 raster->point_smooth = !ctx->Point.PointSprite && ctx->Point.SmoothFlag;
172
173 /* _NEW_POINT | _NEW_PROGRAM
174 */
175 if (ctx->Point.PointSprite) {
176 /* origin */
177 if ((ctx->Point.SpriteOrigin == GL_UPPER_LEFT) ^
178 (st->state.fb_orientation == Y_0_BOTTOM))
179 raster->sprite_coord_mode = PIPE_SPRITE_COORD_UPPER_LEFT;
180 else
181 raster->sprite_coord_mode = PIPE_SPRITE_COORD_LOWER_LEFT;
182
183 /* Coord replacement flags. If bit 'k' is set that means
184 * that we need to replace GENERIC[k] attrib with an automatically
185 * computed texture coord.
186 */
187 raster->sprite_coord_enable = ctx->Point.CoordReplace &
188 ((1u << MAX_TEXTURE_COORD_UNITS) - 1);
189 if (!st->needs_texcoord_semantic &&
190 fragProg->info.inputs_read & VARYING_BIT_PNTC) {
191 raster->sprite_coord_enable |=
192 1 << st_get_generic_varying_index(st, VARYING_SLOT_PNTC);
193 }
194
195 raster->point_quad_rasterization = 1;
196 }
197
198 /* ST_NEW_VERTEX_PROGRAM
199 */
200 if (vertProg) {
201 if (vertProg->Id == 0) {
202 if (vertProg->info.outputs_written &
203 BITFIELD64_BIT(VARYING_SLOT_PSIZ)) {
204 /* generated program which emits point size */
205 raster->point_size_per_vertex = TRUE;
206 }
207 }
208 else if (ctx->API != API_OPENGLES2) {
209 /* PointSizeEnabled is always set in ES2 contexts */
210 raster->point_size_per_vertex = ctx->VertexProgram.PointSizeEnabled;
211 }
212 else {
213 /* ST_NEW_TESSEVAL_PROGRAM | ST_NEW_GEOMETRY_PROGRAM */
214 /* We have to check the last bound stage and see if it writes psize */
215 struct gl_program *last = NULL;
216 if (ctx->GeometryProgram._Current)
217 last = ctx->GeometryProgram._Current;
218 else if (ctx->TessEvalProgram._Current)
219 last = ctx->TessEvalProgram._Current;
220 else if (ctx->VertexProgram._Current)
221 last = ctx->VertexProgram._Current;
222 if (last)
223 raster->point_size_per_vertex =
224 !!(last->info.outputs_written &
225 BITFIELD64_BIT(VARYING_SLOT_PSIZ));
226 }
227 }
228 if (!raster->point_size_per_vertex) {
229 /* clamp size now */
230 raster->point_size = CLAMP(ctx->Point.Size,
231 ctx->Point.MinSize,
232 ctx->Point.MaxSize);
233 }
234
235 /* _NEW_LINE
236 */
237 raster->line_smooth = ctx->Line.SmoothFlag;
238 if (ctx->Line.SmoothFlag) {
239 raster->line_width = CLAMP(ctx->Line.Width,
240 ctx->Const.MinLineWidthAA,
241 ctx->Const.MaxLineWidthAA);
242 }
243 else {
244 raster->line_width = CLAMP(ctx->Line.Width,
245 ctx->Const.MinLineWidth,
246 ctx->Const.MaxLineWidth);
247 }
248
249 raster->line_stipple_enable = ctx->Line.StippleFlag;
250 raster->line_stipple_pattern = ctx->Line.StipplePattern;
251 /* GL stipple factor is in [1,256], remap to [0, 255] here */
252 raster->line_stipple_factor = ctx->Line.StippleFactor - 1;
253
254 /* _NEW_MULTISAMPLE */
255 raster->multisample = _mesa_is_multisample_enabled(ctx);
256
257 /* _NEW_MULTISAMPLE | _NEW_BUFFERS */
258 raster->force_persample_interp =
259 !st->force_persample_in_shader &&
260 raster->multisample &&
261 ctx->Multisample.SampleShading &&
262 ctx->Multisample.MinSampleShadingValue *
263 _mesa_geometric_samples(ctx->DrawBuffer) > 1;
264
265 /* _NEW_SCISSOR */
266 raster->scissor = !!ctx->Scissor.EnableFlags;
267
268 /* _NEW_FRAG_CLAMP */
269 raster->clamp_fragment_color = !st->clamp_frag_color_in_shader &&
270 ctx->Color._ClampFragmentColor;
271
272 raster->half_pixel_center = 1;
273 if (st->state.fb_orientation == Y_0_TOP)
274 raster->bottom_edge_rule = 1;
275
276 /* _NEW_TRANSFORM */
277 if (ctx->Transform.ClipOrigin == GL_UPPER_LEFT)
278 raster->bottom_edge_rule ^= 1;
279
280 /* ST_NEW_RASTERIZER */
281 raster->rasterizer_discard = ctx->RasterDiscard;
282 if (ctx->TileRasterOrderFixed) {
283 raster->tile_raster_order_fixed = true;
284 raster->tile_raster_order_increasing_x = ctx->TileRasterOrderIncreasingX;
285 raster->tile_raster_order_increasing_y = ctx->TileRasterOrderIncreasingY;
286 }
287
288 if (st->edgeflag_culls_prims) {
289 /* All edge flags are FALSE. Cull the affected faces. */
290 if (raster->fill_front != PIPE_POLYGON_MODE_FILL)
291 raster->cull_face |= PIPE_FACE_FRONT;
292 if (raster->fill_back != PIPE_POLYGON_MODE_FILL)
293 raster->cull_face |= PIPE_FACE_BACK;
294 }
295
296 /* _NEW_TRANSFORM */
297 raster->depth_clip = !ctx->Transform.DepthClamp;
298 raster->clip_plane_enable = ctx->Transform.ClipPlanesEnabled;
299 raster->clip_halfz = (ctx->Transform.ClipDepthMode == GL_ZERO_TO_ONE);
300
301 cso_set_rasterizer(st->cso_context, raster);
302 }
303