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"
41 struct draw_context
*draw_create( void )
43 struct draw_context
*draw
= CALLOC_STRUCT( draw_context
);
47 ASSIGN_4V( draw
->plane
[0], -1, 0, 0, 1 );
48 ASSIGN_4V( draw
->plane
[1], 1, 0, 0, 1 );
49 ASSIGN_4V( draw
->plane
[2], 0, -1, 0, 1 );
50 ASSIGN_4V( draw
->plane
[3], 0, 1, 0, 1 );
51 ASSIGN_4V( draw
->plane
[4], 0, 0, 1, 1 ); /* yes these are correct */
52 ASSIGN_4V( draw
->plane
[5], 0, 0, -1, 1 ); /* mesa's a bit wonky */
56 draw
->reduced_prim
= ~0; /* != any of PIPE_PRIM_x */
59 if (!draw_pipeline_init( draw
))
62 if (!draw_pt_init( draw
))
65 if (!draw_vs_init( draw
))
68 if (!draw_gs_init( draw
))
79 void draw_destroy( struct draw_context
*draw
)
86 /* Not so fast -- we're just borrowing this at the moment.
89 draw->render->destroy( draw->render );
92 draw_pipeline_destroy( draw
);
93 draw_pt_destroy( draw
);
94 draw_vs_destroy( draw
);
95 draw_gs_destroy( draw
);
102 void draw_flush( struct draw_context
*draw
)
104 draw_do_flush( draw
, DRAW_FLUSH_BACKEND
);
109 * Specify the Minimum Resolvable Depth factor for polygon offset.
110 * This factor potentially depends on the number of Z buffer bits,
111 * the rasterization algorithm and the arithmetic performed on Z
112 * values between vertex shading and rasterization. It will vary
113 * from one driver to another.
115 void draw_set_mrd(struct draw_context
*draw
, double mrd
)
122 * Register new primitive rasterization/rendering state.
123 * This causes the drawing pipeline to be rebuilt.
125 void draw_set_rasterizer_state( struct draw_context
*draw
,
126 const struct pipe_rasterizer_state
*raster
)
128 draw_do_flush( draw
, DRAW_FLUSH_STATE_CHANGE
);
130 draw
->rasterizer
= raster
;
131 draw
->bypass_clipping
= 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
->driver
.bypass_clipping
;
146 * Plug in the primitive rendering/rasterization stage (which is the last
147 * stage in the drawing pipeline).
148 * This is provided by the device driver.
150 void draw_set_rasterize_stage( struct draw_context
*draw
,
151 struct draw_stage
*stage
)
153 draw_do_flush( draw
, DRAW_FLUSH_STATE_CHANGE
);
155 draw
->pipeline
.rasterize
= stage
;
160 * Set the draw module's clipping state.
162 void draw_set_clip_state( struct draw_context
*draw
,
163 const struct pipe_clip_state
*clip
)
165 draw_do_flush( draw
, DRAW_FLUSH_STATE_CHANGE
);
167 assert(clip
->nr
<= PIPE_MAX_CLIP_PLANES
);
168 memcpy(&draw
->plane
[6], clip
->ucp
, clip
->nr
* sizeof(clip
->ucp
[0]));
169 draw
->nr_planes
= 6 + clip
->nr
;
174 * Set the draw module's viewport state.
176 void draw_set_viewport_state( struct draw_context
*draw
,
177 const struct pipe_viewport_state
*viewport
)
179 draw_do_flush( draw
, DRAW_FLUSH_STATE_CHANGE
);
180 draw
->viewport
= *viewport
; /* struct copy */
181 draw
->identity_viewport
= (viewport
->scale
[0] == 1.0f
&&
182 viewport
->scale
[1] == 1.0f
&&
183 viewport
->scale
[2] == 1.0f
&&
184 viewport
->scale
[3] == 1.0f
&&
185 viewport
->translate
[0] == 0.0f
&&
186 viewport
->translate
[1] == 0.0f
&&
187 viewport
->translate
[2] == 0.0f
&&
188 viewport
->translate
[3] == 0.0f
);
190 draw_vs_set_viewport( draw
, viewport
);
196 draw_set_vertex_buffers(struct draw_context
*draw
,
198 const struct pipe_vertex_buffer
*buffers
)
200 assert(count
<= PIPE_MAX_ATTRIBS
);
202 memcpy(draw
->pt
.vertex_buffer
, buffers
, count
* sizeof(buffers
[0]));
203 draw
->pt
.nr_vertex_buffers
= count
;
208 draw_set_vertex_elements(struct draw_context
*draw
,
210 const struct pipe_vertex_element
*elements
)
212 assert(count
<= PIPE_MAX_ATTRIBS
);
214 memcpy(draw
->pt
.vertex_element
, elements
, count
* sizeof(elements
[0]));
215 draw
->pt
.nr_vertex_elements
= count
;
220 * Tell drawing context where to find mapped vertex buffers.
223 draw_set_mapped_vertex_buffer(struct draw_context
*draw
,
224 unsigned attr
, const void *buffer
)
226 draw
->pt
.user
.vbuffer
[attr
] = buffer
;
231 draw_set_mapped_constant_buffer(struct draw_context
*draw
,
232 unsigned shader_type
,
237 debug_assert(shader_type
== PIPE_SHADER_VERTEX
||
238 shader_type
== PIPE_SHADER_GEOMETRY
);
239 debug_assert(slot
< PIPE_MAX_CONSTANT_BUFFERS
);
241 if (shader_type
== PIPE_SHADER_VERTEX
) {
242 draw
->pt
.user
.vs_constants
[slot
] = buffer
;
243 draw_vs_set_constants(draw
, slot
, buffer
, size
);
244 } else if (shader_type
== PIPE_SHADER_GEOMETRY
) {
245 draw
->pt
.user
.gs_constants
[slot
] = buffer
;
246 draw_gs_set_constants(draw
, slot
, buffer
, size
);
252 * Tells the draw module to draw points with triangles if their size
253 * is greater than this threshold.
256 draw_wide_point_threshold(struct draw_context
*draw
, float threshold
)
258 draw_do_flush( draw
, DRAW_FLUSH_STATE_CHANGE
);
259 draw
->pipeline
.wide_point_threshold
= threshold
;
264 * Tells the draw module to draw lines with triangles if their width
265 * is greater than this threshold.
268 draw_wide_line_threshold(struct draw_context
*draw
, float threshold
)
270 draw_do_flush( draw
, DRAW_FLUSH_STATE_CHANGE
);
271 draw
->pipeline
.wide_line_threshold
= threshold
;
276 * Tells the draw module whether or not to implement line stipple.
279 draw_enable_line_stipple(struct draw_context
*draw
, boolean enable
)
281 draw_do_flush( draw
, DRAW_FLUSH_STATE_CHANGE
);
282 draw
->pipeline
.line_stipple
= enable
;
287 * Tells draw module whether to convert points to quads for sprite mode.
290 draw_enable_point_sprites(struct draw_context
*draw
, boolean enable
)
292 draw_do_flush( draw
, DRAW_FLUSH_STATE_CHANGE
);
293 draw
->pipeline
.point_sprite
= enable
;
298 draw_set_force_passthrough( struct draw_context
*draw
, boolean enable
)
300 draw_do_flush( draw
, DRAW_FLUSH_STATE_CHANGE
);
301 draw
->force_passthrough
= enable
;
306 * Ask the draw module for the location/slot of the given vertex attribute in
307 * a post-transformed vertex.
309 * With this function, drivers that use the draw module should have no reason
310 * to track the current vertex/geometry shader.
312 * Note that the draw module may sometimes generate vertices with extra
313 * attributes (such as texcoords for AA lines). The driver can call this
314 * function to find those attributes.
316 * Zero is returned if the attribute is not found since this is
317 * a don't care / undefined situtation. Returning -1 would be a bit more
318 * work for the drivers.
321 draw_find_shader_output(const struct draw_context
*draw
,
322 uint semantic_name
, uint semantic_index
)
324 const struct draw_vertex_shader
*vs
= draw
->vs
.vertex_shader
;
325 const struct draw_geometry_shader
*gs
= draw
->gs
.geometry_shader
;
327 const struct tgsi_shader_info
*info
= &vs
->info
;
332 for (i
= 0; i
< info
->num_outputs
; i
++) {
333 if (info
->output_semantic_name
[i
] == semantic_name
&&
334 info
->output_semantic_index
[i
] == semantic_index
)
338 /* XXX there may be more than one extra vertex attrib.
339 * For example, simulated gl_FragCoord and gl_PointCoord.
341 if (draw
->extra_shader_outputs
.semantic_name
== semantic_name
&&
342 draw
->extra_shader_outputs
.semantic_index
== semantic_index
) {
343 return draw
->extra_shader_outputs
.slot
;
351 * Return total number of the shader outputs. This function is similar to
352 * draw_current_shader_outputs() but this function also counts any extra
353 * vertex/geometry output attributes that may be filled in by some draw
354 * stages (such as AA point, AA line).
356 * If geometry shader is present, its output will be returned,
357 * if not vertex shader is used.
360 draw_num_shader_outputs(const struct draw_context
*draw
)
362 uint count
= draw
->vs
.vertex_shader
->info
.num_outputs
;
364 /* If a geometry shader is present, its outputs go to the
365 * driver, else the vertex shader's outputs.
367 if (draw
->gs
.geometry_shader
)
368 count
= draw
->gs
.geometry_shader
->info
.num_outputs
;
370 if (draw
->extra_shader_outputs
.slot
> 0)
377 * Provide TGSI sampler objects for vertex/geometry shaders that use
379 * This might only be used by software drivers for the time being.
382 draw_texture_samplers(struct draw_context
*draw
,
384 struct tgsi_sampler
**samplers
)
386 draw
->vs
.num_samplers
= num_samplers
;
387 draw
->vs
.samplers
= samplers
;
388 draw
->gs
.num_samplers
= num_samplers
;
389 draw
->gs
.samplers
= samplers
;
395 void draw_set_render( struct draw_context
*draw
,
396 struct vbuf_render
*render
)
398 draw
->render
= render
;
404 * Tell the drawing context about the index/element buffer to use
405 * (ala glDrawElements)
406 * If no element buffer is to be used (i.e. glDrawArrays) then this
407 * should be called with eltSize=0 and elements=NULL.
409 * \param draw the drawing context
410 * \param eltSize size of each element (1, 2 or 4 bytes)
411 * \param elements the element buffer ptr
414 draw_set_mapped_element_buffer_range( struct draw_context
*draw
,
418 const void *elements
)
420 draw
->pt
.user
.elts
= elements
;
421 draw
->pt
.user
.eltSize
= eltSize
;
422 draw
->pt
.user
.min_index
= min_index
;
423 draw
->pt
.user
.max_index
= max_index
;
428 draw_set_mapped_element_buffer( struct draw_context
*draw
,
430 const void *elements
)
432 draw
->pt
.user
.elts
= elements
;
433 draw
->pt
.user
.eltSize
= eltSize
;
434 draw
->pt
.user
.min_index
= 0;
435 draw
->pt
.user
.max_index
= 0xffffffff;
441 void draw_do_flush( struct draw_context
*draw
, unsigned flags
)
443 if (!draw
->suspend_flushing
)
445 assert(!draw
->flushing
); /* catch inadvertant recursion */
447 draw
->flushing
= TRUE
;
449 draw_pipeline_flush( draw
, flags
);
451 draw
->reduced_prim
= ~0; /* is reduced_prim needed any more? */
453 draw
->flushing
= FALSE
;
459 * Return the number of output attributes produced by the geometry
460 * shader, if present. If no geometry shader, return the number of
461 * outputs from the vertex shader.
462 * \sa draw_num_shader_outputs
465 draw_current_shader_outputs(const struct draw_context
*draw
)
467 if (draw
->gs
.geometry_shader
)
468 return draw
->gs
.num_gs_outputs
;
469 return draw
->vs
.num_vs_outputs
;
474 * Return the index of the shader output which will contain the
478 draw_current_shader_position_output(const struct draw_context
*draw
)
480 if (draw
->gs
.geometry_shader
)
481 return draw
->gs
.position_output
;
482 return draw
->vs
.position_output
;