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"
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
))
70 if (!draw_gs_init( draw
))
81 void draw_destroy( struct draw_context
*draw
)
88 /* Not so fast -- we're just borrowing this at the moment.
91 draw->render->destroy( draw->render );
94 draw_pipeline_destroy( draw
);
95 draw_pt_destroy( draw
);
96 draw_vs_destroy( draw
);
97 draw_gs_destroy( draw
);
104 void draw_flush( struct draw_context
*draw
)
106 draw_do_flush( draw
, DRAW_FLUSH_BACKEND
);
111 * Specify the Minimum Resolvable Depth factor for polygon offset.
112 * This factor potentially depends on the number of Z buffer bits,
113 * the rasterization algorithm and the arithmetic performed on Z
114 * values between vertex shading and rasterization. It will vary
115 * from one driver to another.
117 void draw_set_mrd(struct draw_context
*draw
, double mrd
)
124 * Register new primitive rasterization/rendering state.
125 * This causes the drawing pipeline to be rebuilt.
127 void draw_set_rasterizer_state( struct draw_context
*draw
,
128 const struct pipe_rasterizer_state
*raster
)
130 draw_do_flush( draw
, DRAW_FLUSH_STATE_CHANGE
);
132 draw
->rasterizer
= raster
;
133 draw
->bypass_clipping
=
134 ((draw
->rasterizer
&& draw
->rasterizer
->bypass_vs_clip_and_viewport
) ||
135 draw
->driver
.bypass_clipping
);
139 void draw_set_driver_clipping( struct draw_context
*draw
,
140 boolean bypass_clipping
)
142 draw_do_flush( draw
, DRAW_FLUSH_STATE_CHANGE
);
144 draw
->driver
.bypass_clipping
= bypass_clipping
;
145 draw
->bypass_clipping
=
146 ((draw
->rasterizer
&& draw
->rasterizer
->bypass_vs_clip_and_viewport
) ||
147 draw
->driver
.bypass_clipping
);
152 * Plug in the primitive rendering/rasterization stage (which is the last
153 * stage in the drawing pipeline).
154 * This is provided by the device driver.
156 void draw_set_rasterize_stage( struct draw_context
*draw
,
157 struct draw_stage
*stage
)
159 draw_do_flush( draw
, DRAW_FLUSH_STATE_CHANGE
);
161 draw
->pipeline
.rasterize
= stage
;
166 * Set the draw module's clipping state.
168 void draw_set_clip_state( struct draw_context
*draw
,
169 const struct pipe_clip_state
*clip
)
171 draw_do_flush( draw
, DRAW_FLUSH_STATE_CHANGE
);
173 assert(clip
->nr
<= PIPE_MAX_CLIP_PLANES
);
174 memcpy(&draw
->plane
[6], clip
->ucp
, clip
->nr
* sizeof(clip
->ucp
[0]));
175 draw
->nr_planes
= 6 + clip
->nr
;
180 * Set the draw module's viewport state.
182 void draw_set_viewport_state( struct draw_context
*draw
,
183 const struct pipe_viewport_state
*viewport
)
185 draw_do_flush( draw
, DRAW_FLUSH_STATE_CHANGE
);
186 draw
->viewport
= *viewport
; /* struct copy */
187 draw
->identity_viewport
= (viewport
->scale
[0] == 1.0f
&&
188 viewport
->scale
[1] == 1.0f
&&
189 viewport
->scale
[2] == 1.0f
&&
190 viewport
->scale
[3] == 1.0f
&&
191 viewport
->translate
[0] == 0.0f
&&
192 viewport
->translate
[1] == 0.0f
&&
193 viewport
->translate
[2] == 0.0f
&&
194 viewport
->translate
[3] == 0.0f
);
196 draw_vs_set_viewport( draw
, viewport
);
202 draw_set_vertex_buffers(struct draw_context
*draw
,
204 const struct pipe_vertex_buffer
*buffers
)
206 assert(count
<= PIPE_MAX_ATTRIBS
);
208 memcpy(draw
->pt
.vertex_buffer
, buffers
, count
* sizeof(buffers
[0]));
209 draw
->pt
.nr_vertex_buffers
= count
;
214 draw_set_vertex_elements(struct draw_context
*draw
,
216 const struct pipe_vertex_element
*elements
)
218 assert(count
<= PIPE_MAX_ATTRIBS
);
220 memcpy(draw
->pt
.vertex_element
, elements
, count
* sizeof(elements
[0]));
221 draw
->pt
.nr_vertex_elements
= count
;
226 * Tell drawing context where to find mapped vertex buffers.
229 draw_set_mapped_vertex_buffer(struct draw_context
*draw
,
230 unsigned attr
, const void *buffer
)
232 draw
->pt
.user
.vbuffer
[attr
] = buffer
;
237 draw_set_mapped_constant_buffer(struct draw_context
*draw
,
238 unsigned shader_type
,
242 debug_assert(shader_type
== PIPE_SHADER_VERTEX
||
243 shader_type
== PIPE_SHADER_GEOMETRY
);
244 if (shader_type
== PIPE_SHADER_VERTEX
) {
245 draw
->pt
.user
.vs_constants
= buffer
;
246 draw_vs_set_constants( draw
, (const float (*)[4])buffer
, size
);
247 } else if (shader_type
== PIPE_SHADER_GEOMETRY
) {
248 draw
->pt
.user
.gs_constants
= buffer
;
249 draw_gs_set_constants( draw
, (const float (*)[4])buffer
, size
);
255 * Tells the draw module to draw points with triangles if their size
256 * is greater than this threshold.
259 draw_wide_point_threshold(struct draw_context
*draw
, float threshold
)
261 draw_do_flush( draw
, DRAW_FLUSH_STATE_CHANGE
);
262 draw
->pipeline
.wide_point_threshold
= threshold
;
267 * Tells the draw module to draw lines with triangles if their width
268 * is greater than this threshold.
271 draw_wide_line_threshold(struct draw_context
*draw
, float threshold
)
273 draw_do_flush( draw
, DRAW_FLUSH_STATE_CHANGE
);
274 draw
->pipeline
.wide_line_threshold
= threshold
;
279 * Tells the draw module whether or not to implement line stipple.
282 draw_enable_line_stipple(struct draw_context
*draw
, boolean enable
)
284 draw_do_flush( draw
, DRAW_FLUSH_STATE_CHANGE
);
285 draw
->pipeline
.line_stipple
= enable
;
290 * Tells draw module whether to convert points to quads for sprite mode.
293 draw_enable_point_sprites(struct draw_context
*draw
, boolean enable
)
295 draw_do_flush( draw
, DRAW_FLUSH_STATE_CHANGE
);
296 draw
->pipeline
.point_sprite
= enable
;
301 draw_set_force_passthrough( struct draw_context
*draw
, boolean enable
)
303 draw_do_flush( draw
, DRAW_FLUSH_STATE_CHANGE
);
304 draw
->force_passthrough
= enable
;
309 * Ask the draw module for the location/slot of the given vertex attribute in
310 * a post-transformed vertex.
312 * With this function, drivers that use the draw module should have no reason
313 * to track the current vertex/geometry shader.
315 * Note that the draw module may sometimes generate vertices with extra
316 * attributes (such as texcoords for AA lines). The driver can call this
317 * function to find those attributes.
319 * Zero is returned if the attribute is not found since this is
320 * a don't care / undefined situtation. Returning -1 would be a bit more
321 * work for the drivers.
324 draw_find_shader_output(const struct draw_context
*draw
,
325 uint semantic_name
, uint semantic_index
)
327 const struct draw_vertex_shader
*vs
= draw
->vs
.vertex_shader
;
328 const struct draw_geometry_shader
*gs
= draw
->gs
.geometry_shader
;
330 const struct tgsi_shader_info
*info
= &vs
->info
;
335 for (i
= 0; i
< info
->num_outputs
; i
++) {
336 if (info
->output_semantic_name
[i
] == semantic_name
&&
337 info
->output_semantic_index
[i
] == semantic_index
)
341 /* XXX there may be more than one extra vertex attrib.
342 * For example, simulated gl_FragCoord and gl_PointCoord.
344 if (draw
->extra_shader_outputs
.semantic_name
== semantic_name
&&
345 draw
->extra_shader_outputs
.semantic_index
== semantic_index
) {
346 return draw
->extra_shader_outputs
.slot
;
354 * Return number of the shader outputs.
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 geometry shader is present, its outputs go to te
365 * driver, not the vertex shaders */
366 if (draw
->gs
.geometry_shader
)
367 count
= draw
->gs
.geometry_shader
->info
.num_outputs
;
369 if (draw
->extra_shader_outputs
.slot
> 0)
376 * Provide TGSI sampler objects for vertex/geometry shaders that use texture fetches.
377 * This might only be used by software drivers for the time being.
380 draw_texture_samplers(struct draw_context
*draw
,
382 struct tgsi_sampler
**samplers
)
384 draw
->vs
.num_samplers
= num_samplers
;
385 draw
->vs
.samplers
= samplers
;
386 draw
->gs
.num_samplers
= num_samplers
;
387 draw
->gs
.samplers
= samplers
;
393 void draw_set_render( struct draw_context
*draw
,
394 struct vbuf_render
*render
)
396 draw
->render
= render
;
402 * Tell the drawing context about the index/element buffer to use
403 * (ala glDrawElements)
404 * If no element buffer is to be used (i.e. glDrawArrays) then this
405 * should be called with eltSize=0 and elements=NULL.
407 * \param draw the drawing context
408 * \param eltSize size of each element (1, 2 or 4 bytes)
409 * \param elements the element buffer ptr
412 draw_set_mapped_element_buffer_range( struct draw_context
*draw
,
416 const void *elements
)
418 draw
->pt
.user
.elts
= elements
;
419 draw
->pt
.user
.eltSize
= eltSize
;
420 draw
->pt
.user
.min_index
= min_index
;
421 draw
->pt
.user
.max_index
= max_index
;
426 draw_set_mapped_element_buffer( struct draw_context
*draw
,
428 const void *elements
)
430 draw
->pt
.user
.elts
= elements
;
431 draw
->pt
.user
.eltSize
= eltSize
;
432 draw
->pt
.user
.min_index
= 0;
433 draw
->pt
.user
.max_index
= 0xffffffff;
439 void draw_do_flush( struct draw_context
*draw
, unsigned flags
)
441 if (!draw
->suspend_flushing
)
443 assert(!draw
->flushing
); /* catch inadvertant recursion */
445 draw
->flushing
= TRUE
;
447 draw_pipeline_flush( draw
, flags
);
449 draw
->reduced_prim
= ~0; /* is reduced_prim needed any more? */
451 draw
->flushing
= FALSE
;
456 int draw_current_shader_outputs(struct draw_context
*draw
)
458 if (draw
->gs
.geometry_shader
)
459 return draw
->gs
.num_gs_outputs
;
460 return draw
->vs
.num_vs_outputs
;
463 int draw_current_shader_position_output(struct draw_context
*draw
)
465 if (draw
->gs
.geometry_shader
)
466 return draw
->gs
.position_output
;
467 return draw
->vs
.position_output
;