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 "pipe/p_context.h"
35 #include "util/u_memory.h"
36 #include "util/u_math.h"
37 #include "draw_context.h"
42 struct draw_context
*draw_create( struct pipe_context
*pipe
)
44 struct draw_context
*draw
= CALLOC_STRUCT( draw_context
);
48 ASSIGN_4V( draw
->plane
[0], -1, 0, 0, 1 );
49 ASSIGN_4V( draw
->plane
[1], 1, 0, 0, 1 );
50 ASSIGN_4V( draw
->plane
[2], 0, -1, 0, 1 );
51 ASSIGN_4V( draw
->plane
[3], 0, 1, 0, 1 );
52 ASSIGN_4V( draw
->plane
[4], 0, 0, 1, 1 ); /* yes these are correct */
53 ASSIGN_4V( draw
->plane
[5], 0, 0, -1, 1 ); /* mesa's a bit wonky */
57 draw
->reduced_prim
= ~0; /* != any of PIPE_PRIM_x */
60 if (!draw_pipeline_init( draw
))
63 if (!draw_pt_init( draw
))
66 if (!draw_vs_init( draw
))
69 if (!draw_gs_init( draw
))
82 void draw_destroy( struct draw_context
*draw
)
84 struct pipe_context
*pipe
= draw
->pipe
;
90 /* free any rasterizer CSOs that we may have created.
92 for (i
= 0; i
< 2; i
++) {
93 for (j
= 0; j
< 2; j
++) {
94 if (draw
->rasterizer_no_cull
[i
][j
]) {
95 pipe
->delete_rasterizer_state(pipe
, draw
->rasterizer_no_cull
[i
][j
]);
100 /* Not so fast -- we're just borrowing this at the moment.
103 draw->render->destroy( draw->render );
106 draw_pipeline_destroy( draw
);
107 draw_pt_destroy( draw
);
108 draw_vs_destroy( draw
);
109 draw_gs_destroy( draw
);
116 void draw_flush( struct draw_context
*draw
)
118 draw_do_flush( draw
, DRAW_FLUSH_BACKEND
);
123 * Specify the Minimum Resolvable Depth factor for polygon offset.
124 * This factor potentially depends on the number of Z buffer bits,
125 * the rasterization algorithm and the arithmetic performed on Z
126 * values between vertex shading and rasterization. It will vary
127 * from one driver to another.
129 void draw_set_mrd(struct draw_context
*draw
, double mrd
)
136 * Register new primitive rasterization/rendering state.
137 * This causes the drawing pipeline to be rebuilt.
139 void draw_set_rasterizer_state( struct draw_context
*draw
,
140 const struct pipe_rasterizer_state
*raster
,
143 if (!draw
->suspend_flushing
) {
144 draw_do_flush( draw
, DRAW_FLUSH_STATE_CHANGE
);
146 draw
->rasterizer
= raster
;
147 draw
->rast_handle
= rast_handle
;
149 draw
->bypass_clipping
= draw
->driver
.bypass_clipping
;
154 void draw_set_driver_clipping( struct draw_context
*draw
,
155 boolean bypass_clipping
)
157 draw_do_flush( draw
, DRAW_FLUSH_STATE_CHANGE
);
159 draw
->driver
.bypass_clipping
= bypass_clipping
;
160 draw
->bypass_clipping
= draw
->driver
.bypass_clipping
;
165 * Plug in the primitive rendering/rasterization stage (which is the last
166 * stage in the drawing pipeline).
167 * This is provided by the device driver.
169 void draw_set_rasterize_stage( struct draw_context
*draw
,
170 struct draw_stage
*stage
)
172 draw_do_flush( draw
, DRAW_FLUSH_STATE_CHANGE
);
174 draw
->pipeline
.rasterize
= stage
;
179 * Set the draw module's clipping state.
181 void draw_set_clip_state( struct draw_context
*draw
,
182 const struct pipe_clip_state
*clip
)
184 draw_do_flush( draw
, DRAW_FLUSH_STATE_CHANGE
);
186 assert(clip
->nr
<= PIPE_MAX_CLIP_PLANES
);
187 memcpy(&draw
->plane
[6], clip
->ucp
, clip
->nr
* sizeof(clip
->ucp
[0]));
188 draw
->nr_planes
= 6 + clip
->nr
;
193 * Set the draw module's viewport state.
195 void draw_set_viewport_state( struct draw_context
*draw
,
196 const struct pipe_viewport_state
*viewport
)
198 draw_do_flush( draw
, DRAW_FLUSH_STATE_CHANGE
);
199 draw
->viewport
= *viewport
; /* struct copy */
200 draw
->identity_viewport
= (viewport
->scale
[0] == 1.0f
&&
201 viewport
->scale
[1] == 1.0f
&&
202 viewport
->scale
[2] == 1.0f
&&
203 viewport
->scale
[3] == 1.0f
&&
204 viewport
->translate
[0] == 0.0f
&&
205 viewport
->translate
[1] == 0.0f
&&
206 viewport
->translate
[2] == 0.0f
&&
207 viewport
->translate
[3] == 0.0f
);
209 draw_vs_set_viewport( draw
, viewport
);
215 draw_set_vertex_buffers(struct draw_context
*draw
,
217 const struct pipe_vertex_buffer
*buffers
)
219 assert(count
<= PIPE_MAX_ATTRIBS
);
221 memcpy(draw
->pt
.vertex_buffer
, buffers
, count
* sizeof(buffers
[0]));
222 draw
->pt
.nr_vertex_buffers
= count
;
227 draw_set_vertex_elements(struct draw_context
*draw
,
229 const struct pipe_vertex_element
*elements
)
231 assert(count
<= PIPE_MAX_ATTRIBS
);
233 memcpy(draw
->pt
.vertex_element
, elements
, count
* sizeof(elements
[0]));
234 draw
->pt
.nr_vertex_elements
= count
;
239 * Tell drawing context where to find mapped vertex buffers.
242 draw_set_mapped_vertex_buffer(struct draw_context
*draw
,
243 unsigned attr
, const void *buffer
)
245 draw
->pt
.user
.vbuffer
[attr
] = buffer
;
250 draw_set_mapped_constant_buffer(struct draw_context
*draw
,
251 unsigned shader_type
,
256 debug_assert(shader_type
== PIPE_SHADER_VERTEX
||
257 shader_type
== PIPE_SHADER_GEOMETRY
);
258 debug_assert(slot
< PIPE_MAX_CONSTANT_BUFFERS
);
260 if (shader_type
== PIPE_SHADER_VERTEX
) {
261 draw
->pt
.user
.vs_constants
[slot
] = buffer
;
262 draw_vs_set_constants(draw
, slot
, buffer
, size
);
263 } else if (shader_type
== PIPE_SHADER_GEOMETRY
) {
264 draw
->pt
.user
.gs_constants
[slot
] = buffer
;
265 draw_gs_set_constants(draw
, slot
, buffer
, size
);
271 * Tells the draw module to draw points with triangles if their size
272 * is greater than this threshold.
275 draw_wide_point_threshold(struct draw_context
*draw
, float threshold
)
277 draw_do_flush( draw
, DRAW_FLUSH_STATE_CHANGE
);
278 draw
->pipeline
.wide_point_threshold
= threshold
;
283 * Tells the draw module to draw lines with triangles if their width
284 * is greater than this threshold.
287 draw_wide_line_threshold(struct draw_context
*draw
, float threshold
)
289 draw_do_flush( draw
, DRAW_FLUSH_STATE_CHANGE
);
290 draw
->pipeline
.wide_line_threshold
= threshold
;
295 * Tells the draw module whether or not to implement line stipple.
298 draw_enable_line_stipple(struct draw_context
*draw
, boolean enable
)
300 draw_do_flush( draw
, DRAW_FLUSH_STATE_CHANGE
);
301 draw
->pipeline
.line_stipple
= enable
;
306 * Tells draw module whether to convert points to quads for sprite mode.
309 draw_enable_point_sprites(struct draw_context
*draw
, boolean enable
)
311 draw_do_flush( draw
, DRAW_FLUSH_STATE_CHANGE
);
312 draw
->pipeline
.point_sprite
= enable
;
317 draw_set_force_passthrough( struct draw_context
*draw
, boolean enable
)
319 draw_do_flush( draw
, DRAW_FLUSH_STATE_CHANGE
);
320 draw
->force_passthrough
= enable
;
325 * Ask the draw module for the location/slot of the given vertex attribute in
326 * a post-transformed vertex.
328 * With this function, drivers that use the draw module should have no reason
329 * to track the current vertex/geometry shader.
331 * Note that the draw module may sometimes generate vertices with extra
332 * attributes (such as texcoords for AA lines). The driver can call this
333 * function to find those attributes.
335 * Zero is returned if the attribute is not found since this is
336 * a don't care / undefined situtation. Returning -1 would be a bit more
337 * work for the drivers.
340 draw_find_shader_output(const struct draw_context
*draw
,
341 uint semantic_name
, uint semantic_index
)
343 const struct draw_vertex_shader
*vs
= draw
->vs
.vertex_shader
;
344 const struct draw_geometry_shader
*gs
= draw
->gs
.geometry_shader
;
346 const struct tgsi_shader_info
*info
= &vs
->info
;
351 for (i
= 0; i
< info
->num_outputs
; i
++) {
352 if (info
->output_semantic_name
[i
] == semantic_name
&&
353 info
->output_semantic_index
[i
] == semantic_index
)
357 /* XXX there may be more than one extra vertex attrib.
358 * For example, simulated gl_FragCoord and gl_PointCoord.
360 if (draw
->extra_shader_outputs
.semantic_name
== semantic_name
&&
361 draw
->extra_shader_outputs
.semantic_index
== semantic_index
) {
362 return draw
->extra_shader_outputs
.slot
;
370 * Return total number of the shader outputs. This function is similar to
371 * draw_current_shader_outputs() but this function also counts any extra
372 * vertex/geometry output attributes that may be filled in by some draw
373 * stages (such as AA point, AA line).
375 * If geometry shader is present, its output will be returned,
376 * if not vertex shader is used.
379 draw_num_shader_outputs(const struct draw_context
*draw
)
381 uint count
= draw
->vs
.vertex_shader
->info
.num_outputs
;
383 /* If a geometry shader is present, its outputs go to the
384 * driver, else the vertex shader's outputs.
386 if (draw
->gs
.geometry_shader
)
387 count
= draw
->gs
.geometry_shader
->info
.num_outputs
;
389 if (draw
->extra_shader_outputs
.slot
> 0)
396 * Provide TGSI sampler objects for vertex/geometry shaders that use
398 * This might only be used by software drivers for the time being.
401 draw_texture_samplers(struct draw_context
*draw
,
403 struct tgsi_sampler
**samplers
)
405 draw
->vs
.num_samplers
= num_samplers
;
406 draw
->vs
.samplers
= samplers
;
407 draw
->gs
.num_samplers
= num_samplers
;
408 draw
->gs
.samplers
= samplers
;
414 void draw_set_render( struct draw_context
*draw
,
415 struct vbuf_render
*render
)
417 draw
->render
= render
;
423 * Tell the drawing context about the index/element buffer to use
424 * (ala glDrawElements)
425 * If no element buffer is to be used (i.e. glDrawArrays) then this
426 * should be called with eltSize=0 and elements=NULL.
428 * \param draw the drawing context
429 * \param eltSize size of each element (1, 2 or 4 bytes)
430 * \param elements the element buffer ptr
433 draw_set_mapped_element_buffer_range( struct draw_context
*draw
,
437 const void *elements
)
439 draw
->pt
.user
.elts
= elements
;
440 draw
->pt
.user
.eltSize
= eltSize
;
441 draw
->pt
.user
.min_index
= min_index
;
442 draw
->pt
.user
.max_index
= max_index
;
447 draw_set_mapped_element_buffer( struct draw_context
*draw
,
449 const void *elements
)
451 draw
->pt
.user
.elts
= elements
;
452 draw
->pt
.user
.eltSize
= eltSize
;
453 draw
->pt
.user
.min_index
= 0;
454 draw
->pt
.user
.max_index
= 0xffffffff;
460 void draw_do_flush( struct draw_context
*draw
, unsigned flags
)
462 if (!draw
->suspend_flushing
)
464 assert(!draw
->flushing
); /* catch inadvertant recursion */
466 draw
->flushing
= TRUE
;
468 draw_pipeline_flush( draw
, flags
);
470 draw
->reduced_prim
= ~0; /* is reduced_prim needed any more? */
472 draw
->flushing
= FALSE
;
478 * Return the number of output attributes produced by the geometry
479 * shader, if present. If no geometry shader, return the number of
480 * outputs from the vertex shader.
481 * \sa draw_num_shader_outputs
484 draw_current_shader_outputs(const struct draw_context
*draw
)
486 if (draw
->gs
.geometry_shader
)
487 return draw
->gs
.num_gs_outputs
;
488 return draw
->vs
.num_vs_outputs
;
493 * Return the index of the shader output which will contain the
497 draw_current_shader_position_output(const struct draw_context
*draw
)
499 if (draw
->gs
.geometry_shader
)
500 return draw
->gs
.position_output
;
501 return draw
->vs
.position_output
;
506 * Return a pointer/handle for a driver/CSO rasterizer object which
507 * disabled culling, stippling, unfilled tris, etc.
508 * This is used by some pipeline stages (such as wide_point, aa_line
509 * and aa_point) which convert points/lines into triangles. In those
510 * cases we don't want to accidentally cull the triangles.
512 * \param scissor should the rasterizer state enable scissoring?
513 * \param flatshade should the rasterizer state use flat shading?
514 * \return rasterizer CSO handle
517 draw_get_rasterizer_no_cull( struct draw_context
*draw
,
521 if (!draw
->rasterizer_no_cull
[scissor
][flatshade
]) {
523 struct pipe_context
*pipe
= draw
->pipe
;
524 struct pipe_rasterizer_state rast
;
526 memset(&rast
, 0, sizeof(rast
));
527 rast
.scissor
= scissor
;
528 rast
.flatshade
= flatshade
;
529 rast
.front_winding
= PIPE_WINDING_CCW
;
530 rast
.gl_rasterization_rules
= draw
->rasterizer
->gl_rasterization_rules
;
532 draw
->rasterizer_no_cull
[scissor
][flatshade
] =
533 pipe
->create_rasterizer_state(pipe
, &rast
);
535 return draw
->rasterizer_no_cull
[scissor
][flatshade
];