1 /**************************************************************************
3 * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
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:
14 * The above copyright notice and this permission notice (including the
15 * next paragraph) shall be included in all copies or substantial portions
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.
26 **************************************************************************/
30 * Keith Whitwell <keith@tungstengraphics.com>
34 #include "util/u_memory.h"
35 #include "util/u_math.h"
36 #include "draw_context.h"
37 #include "draw_vbuf.h"
40 #include "draw_pipe.h"
43 struct draw_context
*draw_create( void )
45 struct draw_context
*draw
= CALLOC_STRUCT( draw_context
);
49 ASSIGN_4V( draw
->plane
[0], -1, 0, 0, 1 );
50 ASSIGN_4V( draw
->plane
[1], 1, 0, 0, 1 );
51 ASSIGN_4V( draw
->plane
[2], 0, -1, 0, 1 );
52 ASSIGN_4V( draw
->plane
[3], 0, 1, 0, 1 );
53 ASSIGN_4V( draw
->plane
[4], 0, 0, 1, 1 ); /* yes these are correct */
54 ASSIGN_4V( draw
->plane
[5], 0, 0, -1, 1 ); /* mesa's a bit wonky */
58 draw
->reduced_prim
= ~0; /* != any of PIPE_PRIM_x */
61 if (!draw_pipeline_init( draw
))
64 if (!draw_pt_init( draw
))
67 if (!draw_vs_init( draw
))
78 void draw_destroy( struct draw_context
*draw
)
85 /* Not so fast -- we're just borrowing this at the moment.
88 draw->render->destroy( draw->render );
91 draw_pipeline_destroy( draw
);
92 draw_pt_destroy( draw
);
93 draw_vs_destroy( draw
);
100 void draw_flush( struct draw_context
*draw
)
102 draw_do_flush( draw
, DRAW_FLUSH_BACKEND
);
107 * Specify the Minimum Resolvable Depth factor for polygon offset.
108 * This factor potentially depends on the number of Z buffer bits,
109 * the rasterization algorithm and the arithmetic performed on Z
110 * values between vertex shading and rasterization. It will vary
111 * from one driver to another.
113 void draw_set_mrd(struct draw_context
*draw
, double mrd
)
120 * Register new primitive rasterization/rendering state.
121 * This causes the drawing pipeline to be rebuilt.
123 void draw_set_rasterizer_state( struct draw_context
*draw
,
124 const struct pipe_rasterizer_state
*raster
)
126 draw_do_flush( draw
, DRAW_FLUSH_STATE_CHANGE
);
128 draw
->rasterizer
= raster
;
129 draw
->bypass_clipping
=
130 ((draw
->rasterizer
&& draw
->rasterizer
->bypass_clipping
) ||
131 draw
->driver
.bypass_clipping
);
135 void draw_set_driver_clipping( struct draw_context
*draw
,
136 boolean bypass_clipping
)
138 draw_do_flush( draw
, DRAW_FLUSH_STATE_CHANGE
);
140 draw
->driver
.bypass_clipping
= bypass_clipping
;
141 draw
->bypass_clipping
= (draw
->rasterizer
->bypass_clipping
||
142 draw
->driver
.bypass_clipping
);
147 * Plug in the primitive rendering/rasterization stage (which is the last
148 * stage in the drawing pipeline).
149 * This is provided by the device driver.
151 void draw_set_rasterize_stage( struct draw_context
*draw
,
152 struct draw_stage
*stage
)
154 draw_do_flush( draw
, DRAW_FLUSH_STATE_CHANGE
);
156 draw
->pipeline
.rasterize
= stage
;
161 * Set the draw module's clipping state.
163 void draw_set_clip_state( struct draw_context
*draw
,
164 const struct pipe_clip_state
*clip
)
166 draw_do_flush( draw
, DRAW_FLUSH_STATE_CHANGE
);
168 assert(clip
->nr
<= PIPE_MAX_CLIP_PLANES
);
169 memcpy(&draw
->plane
[6], clip
->ucp
, clip
->nr
* sizeof(clip
->ucp
[0]));
170 draw
->nr_planes
= 6 + clip
->nr
;
175 * Set the draw module's viewport state.
177 void draw_set_viewport_state( struct draw_context
*draw
,
178 const struct pipe_viewport_state
*viewport
)
180 draw_do_flush( draw
, DRAW_FLUSH_STATE_CHANGE
);
181 draw
->viewport
= *viewport
; /* struct copy */
182 draw
->identity_viewport
= (viewport
->scale
[0] == 1.0f
&&
183 viewport
->scale
[1] == 1.0f
&&
184 viewport
->scale
[2] == 1.0f
&&
185 viewport
->scale
[3] == 1.0f
&&
186 viewport
->translate
[0] == 0.0f
&&
187 viewport
->translate
[1] == 0.0f
&&
188 viewport
->translate
[2] == 0.0f
&&
189 viewport
->translate
[3] == 0.0f
);
191 draw_vs_set_viewport( draw
, viewport
);
197 draw_set_vertex_buffers(struct draw_context
*draw
,
199 const struct pipe_vertex_buffer
*buffers
)
201 assert(count
<= PIPE_MAX_ATTRIBS
);
203 memcpy(draw
->pt
.vertex_buffer
, buffers
, count
* sizeof(buffers
[0]));
204 draw
->pt
.nr_vertex_buffers
= count
;
209 draw_set_vertex_elements(struct draw_context
*draw
,
211 const struct pipe_vertex_element
*elements
)
213 assert(count
<= PIPE_MAX_ATTRIBS
);
215 memcpy(draw
->pt
.vertex_element
, elements
, count
* sizeof(elements
[0]));
216 draw
->pt
.nr_vertex_elements
= count
;
221 * Tell drawing context where to find mapped vertex buffers.
224 draw_set_mapped_vertex_buffer(struct draw_context
*draw
,
225 unsigned attr
, const void *buffer
)
227 draw
->pt
.user
.vbuffer
[attr
] = buffer
;
232 draw_set_mapped_constant_buffer(struct draw_context
*draw
,
236 draw
->pt
.user
.constants
= buffer
;
237 draw_vs_set_constants( draw
, (const float (*)[4])buffer
, size
);
242 * Tells the draw module to draw points with triangles if their size
243 * is greater than this threshold.
246 draw_wide_point_threshold(struct draw_context
*draw
, float threshold
)
248 draw_do_flush( draw
, DRAW_FLUSH_STATE_CHANGE
);
249 draw
->pipeline
.wide_point_threshold
= threshold
;
254 * Tells the draw module to draw lines with triangles if their width
255 * is greater than this threshold.
258 draw_wide_line_threshold(struct draw_context
*draw
, float threshold
)
260 draw_do_flush( draw
, DRAW_FLUSH_STATE_CHANGE
);
261 draw
->pipeline
.wide_line_threshold
= threshold
;
266 * Tells the draw module whether or not to implement line stipple.
269 draw_enable_line_stipple(struct draw_context
*draw
, boolean enable
)
271 draw_do_flush( draw
, DRAW_FLUSH_STATE_CHANGE
);
272 draw
->pipeline
.line_stipple
= enable
;
277 * Tells draw module whether to convert points to quads for sprite mode.
280 draw_enable_point_sprites(struct draw_context
*draw
, boolean enable
)
282 draw_do_flush( draw
, DRAW_FLUSH_STATE_CHANGE
);
283 draw
->pipeline
.point_sprite
= enable
;
288 draw_set_force_passthrough( struct draw_context
*draw
, boolean enable
)
290 draw_do_flush( draw
, DRAW_FLUSH_STATE_CHANGE
);
291 draw
->force_passthrough
= enable
;
296 * Ask the draw module for the location/slot of the given vertex attribute in
297 * a post-transformed vertex.
299 * With this function, drivers that use the draw module should have no reason
300 * to track the current vertex shader.
302 * Note that the draw module may sometimes generate vertices with extra
303 * attributes (such as texcoords for AA lines). The driver can call this
304 * function to find those attributes.
306 * Zero is returned if the attribute is not found since this is
307 * a don't care / undefined situtation. Returning -1 would be a bit more
308 * work for the drivers.
311 draw_find_vs_output(const struct draw_context
*draw
,
312 uint semantic_name
, uint semantic_index
)
314 const struct draw_vertex_shader
*vs
= draw
->vs
.vertex_shader
;
316 for (i
= 0; i
< vs
->info
.num_outputs
; i
++) {
317 if (vs
->info
.output_semantic_name
[i
] == semantic_name
&&
318 vs
->info
.output_semantic_index
[i
] == semantic_index
)
322 /* XXX there may be more than one extra vertex attrib.
323 * For example, simulated gl_FragCoord and gl_PointCoord.
325 if (draw
->extra_vp_outputs
.semantic_name
== semantic_name
&&
326 draw
->extra_vp_outputs
.semantic_index
== semantic_index
) {
327 return draw
->extra_vp_outputs
.slot
;
334 * Return number of vertex shader outputs.
337 draw_num_vs_outputs(const struct draw_context
*draw
)
339 uint count
= draw
->vs
.vertex_shader
->info
.num_outputs
;
340 if (draw
->extra_vp_outputs
.slot
> 0)
347 * Provide TGSI sampler objects for vertex shaders that use texture fetches.
348 * This might only be used by software drivers for the time being.
351 draw_texture_samplers(struct draw_context
*draw
,
353 struct tgsi_sampler
**samplers
)
355 draw
->vs
.num_samplers
= num_samplers
;
356 draw
->vs
.samplers
= samplers
;
362 void draw_set_render( struct draw_context
*draw
,
363 struct vbuf_render
*render
)
365 draw
->render
= render
;
368 void draw_set_edgeflags( struct draw_context
*draw
,
369 const unsigned *edgeflag
)
371 draw
->pt
.user
.edgeflag
= edgeflag
;
378 * Tell the drawing context about the index/element buffer to use
379 * (ala glDrawElements)
380 * If no element buffer is to be used (i.e. glDrawArrays) then this
381 * should be called with eltSize=0 and elements=NULL.
383 * \param draw the drawing context
384 * \param eltSize size of each element (1, 2 or 4 bytes)
385 * \param elements the element buffer ptr
388 draw_set_mapped_element_buffer_range( struct draw_context
*draw
,
392 const void *elements
)
394 draw
->pt
.user
.elts
= elements
;
395 draw
->pt
.user
.eltSize
= eltSize
;
396 draw
->pt
.user
.min_index
= min_index
;
397 draw
->pt
.user
.max_index
= max_index
;
402 draw_set_mapped_element_buffer( struct draw_context
*draw
,
404 const void *elements
)
406 draw
->pt
.user
.elts
= elements
;
407 draw
->pt
.user
.eltSize
= eltSize
;
408 draw
->pt
.user
.min_index
= 0;
409 draw
->pt
.user
.max_index
= 0xffffffff;
415 void draw_do_flush( struct draw_context
*draw
, unsigned flags
)
417 if (!draw
->suspend_flushing
)
419 assert(!draw
->flushing
); /* catch inadvertant recursion */
421 draw
->flushing
= TRUE
;
423 draw_pipeline_flush( draw
, flags
);
425 draw
->reduced_prim
= ~0; /* is reduced_prim needed any more? */
427 draw
->flushing
= FALSE
;