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 #include "gallivm/lp_bld_init.h"
45 struct draw_context
*draw_create( struct pipe_context
*pipe
)
47 struct draw_context
*draw
= CALLOC_STRUCT( draw_context
);
53 assert(lp_build_engine
);
54 draw
->engine
= lp_build_engine
;
69 boolean
draw_init(struct draw_context
*draw
)
72 * Note that several functions compute the clipmask of the predefined
73 * formats with hardcoded formulas instead of using these. So modifications
74 * here must be reflected there too.
77 ASSIGN_4V( draw
->plane
[0], -1, 0, 0, 1 );
78 ASSIGN_4V( draw
->plane
[1], 1, 0, 0, 1 );
79 ASSIGN_4V( draw
->plane
[2], 0, -1, 0, 1 );
80 ASSIGN_4V( draw
->plane
[3], 0, 1, 0, 1 );
81 ASSIGN_4V( draw
->plane
[4], 0, 0, 1, 1 ); /* yes these are correct */
82 ASSIGN_4V( draw
->plane
[5], 0, 0, -1, 1 ); /* mesa's a bit wonky */
86 draw
->reduced_prim
= ~0; /* != any of PIPE_PRIM_x */
89 if (!draw_pipeline_init( draw
))
92 if (!draw_pt_init( draw
))
95 if (!draw_vs_init( draw
))
98 if (!draw_gs_init( draw
))
105 void draw_destroy( struct draw_context
*draw
)
107 struct pipe_context
*pipe
;
115 /* free any rasterizer CSOs that we may have created.
117 for (i
= 0; i
< 2; i
++) {
118 for (j
= 0; j
< 2; j
++) {
119 if (draw
->rasterizer_no_cull
[i
][j
]) {
120 pipe
->delete_rasterizer_state(pipe
, draw
->rasterizer_no_cull
[i
][j
]);
125 /* Not so fast -- we're just borrowing this at the moment.
128 draw->render->destroy( draw->render );
131 draw_pipeline_destroy( draw
);
132 draw_pt_destroy( draw
);
133 draw_vs_destroy( draw
);
134 draw_gs_destroy( draw
);
141 void draw_flush( struct draw_context
*draw
)
143 draw_do_flush( draw
, DRAW_FLUSH_BACKEND
);
148 * Specify the Minimum Resolvable Depth factor for polygon offset.
149 * This factor potentially depends on the number of Z buffer bits,
150 * the rasterization algorithm and the arithmetic performed on Z
151 * values between vertex shading and rasterization. It will vary
152 * from one driver to another.
154 void draw_set_mrd(struct draw_context
*draw
, double mrd
)
161 * Register new primitive rasterization/rendering state.
162 * This causes the drawing pipeline to be rebuilt.
164 void draw_set_rasterizer_state( struct draw_context
*draw
,
165 const struct pipe_rasterizer_state
*raster
,
168 if (!draw
->suspend_flushing
) {
169 draw_do_flush( draw
, DRAW_FLUSH_STATE_CHANGE
);
171 draw
->rasterizer
= raster
;
172 draw
->rast_handle
= rast_handle
;
174 draw
->bypass_clipping
= draw
->driver
.bypass_clipping
;
179 void draw_set_driver_clipping( struct draw_context
*draw
,
180 boolean bypass_clipping
)
182 draw_do_flush( draw
, DRAW_FLUSH_STATE_CHANGE
);
184 draw
->driver
.bypass_clipping
= bypass_clipping
;
185 draw
->bypass_clipping
= draw
->driver
.bypass_clipping
;
190 * Plug in the primitive rendering/rasterization stage (which is the last
191 * stage in the drawing pipeline).
192 * This is provided by the device driver.
194 void draw_set_rasterize_stage( struct draw_context
*draw
,
195 struct draw_stage
*stage
)
197 draw_do_flush( draw
, DRAW_FLUSH_STATE_CHANGE
);
199 draw
->pipeline
.rasterize
= stage
;
204 * Set the draw module's clipping state.
206 void draw_set_clip_state( struct draw_context
*draw
,
207 const struct pipe_clip_state
*clip
)
209 draw_do_flush( draw
, DRAW_FLUSH_STATE_CHANGE
);
211 assert(clip
->nr
<= PIPE_MAX_CLIP_PLANES
);
212 memcpy(&draw
->plane
[6], clip
->ucp
, clip
->nr
* sizeof(clip
->ucp
[0]));
213 draw
->nr_planes
= 6 + clip
->nr
;
218 * Set the draw module's viewport state.
220 void draw_set_viewport_state( struct draw_context
*draw
,
221 const struct pipe_viewport_state
*viewport
)
223 draw_do_flush( draw
, DRAW_FLUSH_STATE_CHANGE
);
224 draw
->viewport
= *viewport
; /* struct copy */
225 draw
->identity_viewport
= (viewport
->scale
[0] == 1.0f
&&
226 viewport
->scale
[1] == 1.0f
&&
227 viewport
->scale
[2] == 1.0f
&&
228 viewport
->scale
[3] == 1.0f
&&
229 viewport
->translate
[0] == 0.0f
&&
230 viewport
->translate
[1] == 0.0f
&&
231 viewport
->translate
[2] == 0.0f
&&
232 viewport
->translate
[3] == 0.0f
);
234 draw_vs_set_viewport( draw
, viewport
);
240 draw_set_vertex_buffers(struct draw_context
*draw
,
242 const struct pipe_vertex_buffer
*buffers
)
244 assert(count
<= PIPE_MAX_ATTRIBS
);
246 memcpy(draw
->pt
.vertex_buffer
, buffers
, count
* sizeof(buffers
[0]));
247 draw
->pt
.nr_vertex_buffers
= count
;
252 draw_set_vertex_elements(struct draw_context
*draw
,
254 const struct pipe_vertex_element
*elements
)
256 assert(count
<= PIPE_MAX_ATTRIBS
);
258 memcpy(draw
->pt
.vertex_element
, elements
, count
* sizeof(elements
[0]));
259 draw
->pt
.nr_vertex_elements
= count
;
264 * Tell drawing context where to find mapped vertex buffers.
267 draw_set_mapped_vertex_buffer(struct draw_context
*draw
,
268 unsigned attr
, const void *buffer
)
270 draw
->pt
.user
.vbuffer
[attr
] = buffer
;
275 draw_set_mapped_constant_buffer(struct draw_context
*draw
,
276 unsigned shader_type
,
281 debug_assert(shader_type
== PIPE_SHADER_VERTEX
||
282 shader_type
== PIPE_SHADER_GEOMETRY
);
283 debug_assert(slot
< PIPE_MAX_CONSTANT_BUFFERS
);
285 if (shader_type
== PIPE_SHADER_VERTEX
) {
286 draw
->pt
.user
.vs_constants
[slot
] = buffer
;
287 draw_vs_set_constants(draw
, slot
, buffer
, size
);
288 } else if (shader_type
== PIPE_SHADER_GEOMETRY
) {
289 draw
->pt
.user
.gs_constants
[slot
] = buffer
;
290 draw_gs_set_constants(draw
, slot
, buffer
, size
);
296 * Tells the draw module to draw points with triangles if their size
297 * is greater than this threshold.
300 draw_wide_point_threshold(struct draw_context
*draw
, float threshold
)
302 draw_do_flush( draw
, DRAW_FLUSH_STATE_CHANGE
);
303 draw
->pipeline
.wide_point_threshold
= threshold
;
308 * Should the draw module handle point->quad conversion for drawing sprites?
311 draw_wide_point_sprites(struct draw_context
*draw
, boolean draw_sprite
)
313 draw_do_flush( draw
, DRAW_FLUSH_STATE_CHANGE
);
314 draw
->pipeline
.wide_point_sprites
= draw_sprite
;
319 * Tells the draw module to draw lines with triangles if their width
320 * is greater than this threshold.
323 draw_wide_line_threshold(struct draw_context
*draw
, float threshold
)
325 draw_do_flush( draw
, DRAW_FLUSH_STATE_CHANGE
);
326 draw
->pipeline
.wide_line_threshold
= threshold
;
331 * Tells the draw module whether or not to implement line stipple.
334 draw_enable_line_stipple(struct draw_context
*draw
, boolean enable
)
336 draw_do_flush( draw
, DRAW_FLUSH_STATE_CHANGE
);
337 draw
->pipeline
.line_stipple
= enable
;
342 * Tells draw module whether to convert points to quads for sprite mode.
345 draw_enable_point_sprites(struct draw_context
*draw
, boolean enable
)
347 draw_do_flush( draw
, DRAW_FLUSH_STATE_CHANGE
);
348 draw
->pipeline
.point_sprite
= enable
;
353 draw_set_force_passthrough( struct draw_context
*draw
, boolean enable
)
355 draw_do_flush( draw
, DRAW_FLUSH_STATE_CHANGE
);
356 draw
->force_passthrough
= enable
;
361 * Ask the draw module for the location/slot of the given vertex attribute in
362 * a post-transformed vertex.
364 * With this function, drivers that use the draw module should have no reason
365 * to track the current vertex/geometry shader.
367 * Note that the draw module may sometimes generate vertices with extra
368 * attributes (such as texcoords for AA lines). The driver can call this
369 * function to find those attributes.
371 * Zero is returned if the attribute is not found since this is
372 * a don't care / undefined situtation. Returning -1 would be a bit more
373 * work for the drivers.
376 draw_find_shader_output(const struct draw_context
*draw
,
377 uint semantic_name
, uint semantic_index
)
379 const struct draw_vertex_shader
*vs
= draw
->vs
.vertex_shader
;
380 const struct draw_geometry_shader
*gs
= draw
->gs
.geometry_shader
;
382 const struct tgsi_shader_info
*info
= &vs
->info
;
387 for (i
= 0; i
< info
->num_outputs
; i
++) {
388 if (info
->output_semantic_name
[i
] == semantic_name
&&
389 info
->output_semantic_index
[i
] == semantic_index
)
393 /* XXX there may be more than one extra vertex attrib.
394 * For example, simulated gl_FragCoord and gl_PointCoord.
396 if (draw
->extra_shader_outputs
.semantic_name
== semantic_name
&&
397 draw
->extra_shader_outputs
.semantic_index
== semantic_index
) {
398 return draw
->extra_shader_outputs
.slot
;
406 * Return total number of the shader outputs. This function is similar to
407 * draw_current_shader_outputs() but this function also counts any extra
408 * vertex/geometry output attributes that may be filled in by some draw
409 * stages (such as AA point, AA line).
411 * If geometry shader is present, its output will be returned,
412 * if not vertex shader is used.
415 draw_num_shader_outputs(const struct draw_context
*draw
)
417 uint count
= draw
->vs
.vertex_shader
->info
.num_outputs
;
419 /* If a geometry shader is present, its outputs go to the
420 * driver, else the vertex shader's outputs.
422 if (draw
->gs
.geometry_shader
)
423 count
= draw
->gs
.geometry_shader
->info
.num_outputs
;
425 if (draw
->extra_shader_outputs
.slot
> 0)
432 * Provide TGSI sampler objects for vertex/geometry shaders that use
434 * This might only be used by software drivers for the time being.
437 draw_texture_samplers(struct draw_context
*draw
,
439 struct tgsi_sampler
**samplers
)
441 draw
->vs
.num_samplers
= num_samplers
;
442 draw
->vs
.samplers
= samplers
;
443 draw
->gs
.num_samplers
= num_samplers
;
444 draw
->gs
.samplers
= samplers
;
450 void draw_set_render( struct draw_context
*draw
,
451 struct vbuf_render
*render
)
453 draw
->render
= render
;
459 * Tell the drawing context about the index/element buffer to use
460 * (ala glDrawElements)
461 * If no element buffer is to be used (i.e. glDrawArrays) then this
462 * should be called with eltSize=0 and elements=NULL.
464 * \param draw the drawing context
465 * \param eltSize size of each element (1, 2 or 4 bytes)
466 * \param elements the element buffer ptr
469 draw_set_mapped_element_buffer_range( struct draw_context
*draw
,
474 const void *elements
)
476 draw
->pt
.user
.elts
= elements
;
477 draw
->pt
.user
.eltSize
= eltSize
;
478 draw
->pt
.user
.eltBias
= eltBias
;
479 draw
->pt
.user
.min_index
= min_index
;
480 draw
->pt
.user
.max_index
= max_index
;
485 draw_set_mapped_element_buffer( struct draw_context
*draw
,
488 const void *elements
)
490 draw
->pt
.user
.elts
= elements
;
491 draw
->pt
.user
.eltSize
= eltSize
;
492 draw
->pt
.user
.eltBias
= eltBias
;
493 draw
->pt
.user
.min_index
= 0;
494 draw
->pt
.user
.max_index
= 0xffffffff;
500 void draw_do_flush( struct draw_context
*draw
, unsigned flags
)
502 if (!draw
->suspend_flushing
)
504 assert(!draw
->flushing
); /* catch inadvertant recursion */
506 draw
->flushing
= TRUE
;
508 draw_pipeline_flush( draw
, flags
);
510 draw
->reduced_prim
= ~0; /* is reduced_prim needed any more? */
512 draw
->flushing
= FALSE
;
518 * Return the number of output attributes produced by the geometry
519 * shader, if present. If no geometry shader, return the number of
520 * outputs from the vertex shader.
521 * \sa draw_num_shader_outputs
524 draw_current_shader_outputs(const struct draw_context
*draw
)
526 if (draw
->gs
.geometry_shader
)
527 return draw
->gs
.num_gs_outputs
;
528 return draw
->vs
.num_vs_outputs
;
533 * Return the index of the shader output which will contain the
537 draw_current_shader_position_output(const struct draw_context
*draw
)
539 if (draw
->gs
.geometry_shader
)
540 return draw
->gs
.position_output
;
541 return draw
->vs
.position_output
;
546 * Return a pointer/handle for a driver/CSO rasterizer object which
547 * disabled culling, stippling, unfilled tris, etc.
548 * This is used by some pipeline stages (such as wide_point, aa_line
549 * and aa_point) which convert points/lines into triangles. In those
550 * cases we don't want to accidentally cull the triangles.
552 * \param scissor should the rasterizer state enable scissoring?
553 * \param flatshade should the rasterizer state use flat shading?
554 * \return rasterizer CSO handle
557 draw_get_rasterizer_no_cull( struct draw_context
*draw
,
561 if (!draw
->rasterizer_no_cull
[scissor
][flatshade
]) {
563 struct pipe_context
*pipe
= draw
->pipe
;
564 struct pipe_rasterizer_state rast
;
566 memset(&rast
, 0, sizeof(rast
));
567 rast
.scissor
= scissor
;
568 rast
.flatshade
= flatshade
;
569 rast
.front_winding
= PIPE_WINDING_CCW
;
570 rast
.gl_rasterization_rules
= draw
->rasterizer
->gl_rasterization_rules
;
572 draw
->rasterizer_no_cull
[scissor
][flatshade
] =
573 pipe
->create_rasterizer_state(pipe
, &rast
);
575 return draw
->rasterizer_no_cull
[scissor
][flatshade
];