1 /**************************************************************************
3 * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
6 * Permission is hereby granted, free of charge, to any person obtaining a
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11 * permit persons to whom the Software is furnished to do so, subject to
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14 * The above copyright notice and this permission notice (including the
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18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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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 **************************************************************************/
32 * Abstract graphics pipe state objects.
35 * 1. Want compact representations, so we use bitfields.
36 * 2. Put bitfields before other (GLfloat) fields.
43 #include "p_compiler.h"
44 #include "p_defines.h"
54 * Implementation limits
56 #define PIPE_MAX_ATTRIBS 32
57 #define PIPE_MAX_CLIP_PLANES 8
58 #define PIPE_MAX_COLOR_BUFS 8
59 #define PIPE_MAX_CONSTANT_BUFFERS 32
60 #define PIPE_MAX_SAMPLERS 16
61 #define PIPE_MAX_SHADER_INPUTS 32
62 #define PIPE_MAX_SHADER_OUTPUTS 48 /* 32 GENERICs + POS, PSIZE, FOG, etc. */
63 #define PIPE_MAX_SHADER_SAMPLER_VIEWS 32
64 #define PIPE_MAX_SHADER_RESOURCES 32
65 #define PIPE_MAX_TEXTURE_LEVELS 16
66 #define PIPE_MAX_SO_BUFFERS 4
71 int32_t count; /* atomic */
77 * Primitive (point/line/tri) rasterization info
79 struct pipe_rasterizer_state
82 unsigned light_twoside:1;
83 unsigned clamp_vertex_color:1;
84 unsigned clamp_fragment_color:1;
86 unsigned cull_face:2; /**< PIPE_FACE_x */
87 unsigned fill_front:2; /**< PIPE_POLYGON_MODE_x */
88 unsigned fill_back:2; /**< PIPE_POLYGON_MODE_x */
89 unsigned offset_point:1;
90 unsigned offset_line:1;
91 unsigned offset_tri:1;
93 unsigned poly_smooth:1;
94 unsigned poly_stipple_enable:1;
95 unsigned point_smooth:1;
96 unsigned sprite_coord_mode:1; /**< PIPE_SPRITE_COORD_ */
97 unsigned point_quad_rasterization:1; /** points rasterized as quads or points */
98 unsigned point_size_per_vertex:1; /**< size computed in vertex shader */
99 unsigned multisample:1; /* XXX maybe more ms state in future */
100 unsigned line_smooth:1;
101 unsigned line_stipple_enable:1;
102 unsigned line_last_pixel:1;
105 * Use the first vertex of a primitive as the provoking vertex for
108 unsigned flatshade_first:1;
111 * When true, triangle rasterization uses (0.5, 0.5) pixel centers
112 * for determining pixel ownership.
114 * When false, triangle rasterization uses (0,0) pixel centers for
115 * determining pixel ownership.
117 * Triangle rasterization always uses a 'top,left' rule for pixel
118 * ownership, this just alters which point we consider the pixel
119 * center for that test.
121 unsigned gl_rasterization_rules:1;
124 * When true, rasterization is disabled and no pixels are written.
125 * This only makes sense with the Stream Out functionality.
127 unsigned rasterizer_discard:1;
130 * When false, depth clipping is disabled and the depth value will be
131 * clamped later at the per-pixel level before depth testing.
132 * This depends on PIPE_CAP_DEPTH_CLIP_DISABLE.
134 unsigned depth_clip:1;
137 * Enable bits for clipping half-spaces.
138 * This applies to both user clip planes and shader clip distances.
139 * Note that if the bound shader exports any clip distances, these
140 * replace all user clip planes, and clip half-spaces enabled here
141 * but not written by the shader count as disabled.
143 unsigned clip_plane_enable:PIPE_MAX_CLIP_PLANES;
145 unsigned line_stipple_factor:8; /**< [1..256] actually */
146 unsigned line_stipple_pattern:16;
148 uint32_t sprite_coord_enable; /* referring to 32 TEXCOORD/GENERIC inputs */
151 float point_size; /**< used when no per-vertex size */
158 struct pipe_poly_stipple
160 unsigned stipple[32];
164 struct pipe_viewport_state
171 struct pipe_scissor_state
180 struct pipe_clip_state
182 float ucp[PIPE_MAX_CLIP_PLANES][4];
187 * Stream output for vertex transform feedback.
189 struct pipe_stream_output_info
191 unsigned num_outputs;
192 /** stride for an entire vertex for each buffer in dwords */
193 unsigned stride[PIPE_MAX_SO_BUFFERS];
196 * Array of stream outputs, in the order they are to be written in.
197 * Selected components are tightly packed into the output buffer.
200 unsigned register_index:8; /**< 0 to PIPE_MAX_SHADER_OUTPUTS */
201 unsigned start_component:2; /** 0 to 3 */
202 unsigned num_components:3; /** 1 to 4 */
203 unsigned output_buffer:3; /**< 0 to PIPE_MAX_SO_BUFFERS */
204 unsigned dst_offset:16; /**< offset into the buffer in dwords */
205 } output[PIPE_MAX_SHADER_OUTPUTS];
209 struct pipe_shader_state
211 const struct tgsi_token *tokens;
212 struct pipe_stream_output_info stream_output;
216 struct pipe_depth_state
218 unsigned enabled:1; /**< depth test enabled? */
219 unsigned writemask:1; /**< allow depth buffer writes? */
220 unsigned func:3; /**< depth test func (PIPE_FUNC_x) */
224 struct pipe_stencil_state
226 unsigned enabled:1; /**< stencil[0]: stencil enabled, stencil[1]: two-side enabled */
227 unsigned func:3; /**< PIPE_FUNC_x */
228 unsigned fail_op:3; /**< PIPE_STENCIL_OP_x */
229 unsigned zpass_op:3; /**< PIPE_STENCIL_OP_x */
230 unsigned zfail_op:3; /**< PIPE_STENCIL_OP_x */
231 unsigned valuemask:8;
232 unsigned writemask:8;
236 struct pipe_alpha_state
239 unsigned func:3; /**< PIPE_FUNC_x */
240 float ref_value; /**< reference value */
244 struct pipe_depth_stencil_alpha_state
246 struct pipe_depth_state depth;
247 struct pipe_stencil_state stencil[2]; /**< [0] = front, [1] = back */
248 struct pipe_alpha_state alpha;
252 struct pipe_rt_blend_state
254 unsigned blend_enable:1;
256 unsigned rgb_func:3; /**< PIPE_BLEND_x */
257 unsigned rgb_src_factor:5; /**< PIPE_BLENDFACTOR_x */
258 unsigned rgb_dst_factor:5; /**< PIPE_BLENDFACTOR_x */
260 unsigned alpha_func:3; /**< PIPE_BLEND_x */
261 unsigned alpha_src_factor:5; /**< PIPE_BLENDFACTOR_x */
262 unsigned alpha_dst_factor:5; /**< PIPE_BLENDFACTOR_x */
264 unsigned colormask:4; /**< bitmask of PIPE_MASK_R/G/B/A */
267 struct pipe_blend_state
269 unsigned independent_blend_enable:1;
270 unsigned logicop_enable:1;
271 unsigned logicop_func:4; /**< PIPE_LOGICOP_x */
273 unsigned alpha_to_coverage:1;
274 unsigned alpha_to_one:1;
275 struct pipe_rt_blend_state rt[PIPE_MAX_COLOR_BUFS];
279 struct pipe_blend_color
284 struct pipe_stencil_ref
289 struct pipe_framebuffer_state
291 unsigned width, height;
293 /** multiple color buffers for multiple render targets */
295 struct pipe_surface *cbufs[PIPE_MAX_COLOR_BUFS];
297 struct pipe_surface *zsbuf; /**< Z/stencil buffer */
302 * Texture sampler state.
304 struct pipe_sampler_state
306 unsigned wrap_s:3; /**< PIPE_TEX_WRAP_x */
307 unsigned wrap_t:3; /**< PIPE_TEX_WRAP_x */
308 unsigned wrap_r:3; /**< PIPE_TEX_WRAP_x */
309 unsigned min_img_filter:2; /**< PIPE_TEX_FILTER_x */
310 unsigned min_mip_filter:2; /**< PIPE_TEX_MIPFILTER_x */
311 unsigned mag_img_filter:2; /**< PIPE_TEX_FILTER_x */
312 unsigned compare_mode:1; /**< PIPE_TEX_COMPARE_x */
313 unsigned compare_func:3; /**< PIPE_FUNC_x */
314 unsigned normalized_coords:1; /**< Are coords normalized to [0,1]? */
315 unsigned max_anisotropy:6;
316 unsigned seamless_cube_map:1;
317 float lod_bias; /**< LOD/lambda bias */
318 float min_lod, max_lod; /**< LOD clamp range, after bias */
319 union pipe_color_union border_color;
324 * A view into a texture that can be bound to a color render target /
325 * depth stencil attachment point.
329 struct pipe_reference reference;
330 struct pipe_resource *texture; /**< resource into which this is a view */
331 struct pipe_context *context; /**< context this surface belongs to */
332 enum pipe_format format;
334 /* XXX width/height should be removed */
335 unsigned width; /**< logical width in pixels */
336 unsigned height; /**< logical height in pixels */
338 unsigned writable:1; /**< writable shader resource */
343 unsigned first_layer:16;
344 unsigned last_layer:16;
347 unsigned first_element;
348 unsigned last_element;
355 * A view into a texture that can be bound to a shader stage.
357 struct pipe_sampler_view
359 struct pipe_reference reference;
360 enum pipe_format format; /**< typed PIPE_FORMAT_x */
361 struct pipe_resource *texture; /**< texture into which this is a view */
362 struct pipe_context *context; /**< context this view belongs to */
365 unsigned first_layer:16; /**< first layer to use for array textures */
366 unsigned last_layer:16; /**< last layer to use for array textures */
367 unsigned first_level:8; /**< first mipmap level to use */
368 unsigned last_level:8; /**< last mipmap level to use */
371 unsigned first_element;
372 unsigned last_element;
375 unsigned swizzle_r:3; /**< PIPE_SWIZZLE_x for red component */
376 unsigned swizzle_g:3; /**< PIPE_SWIZZLE_x for green component */
377 unsigned swizzle_b:3; /**< PIPE_SWIZZLE_x for blue component */
378 unsigned swizzle_a:3; /**< PIPE_SWIZZLE_x for alpha component */
383 * Subregion of 1D/2D/3D image resource.
397 * A memory object/resource such as a vertex buffer or texture.
401 struct pipe_reference reference;
402 struct pipe_screen *screen; /**< screen that this texture belongs to */
403 enum pipe_texture_target target; /**< PIPE_TEXTURE_x */
404 enum pipe_format format; /**< PIPE_FORMAT_x */
411 unsigned last_level:8; /**< Index of last mipmap level present/defined */
412 unsigned nr_samples:8; /**< for multisampled surfaces, nr of samples */
413 unsigned usage:8; /**< PIPE_USAGE_x (not a bitmask) */
415 unsigned bind; /**< bitmask of PIPE_BIND_x */
416 unsigned flags; /**< bitmask of PIPE_RESOURCE_FLAG_x */
421 * Transfer object. For data transfer to/from a resource.
425 struct pipe_resource *resource; /**< resource to transfer to/from */
426 unsigned level; /**< texture mipmap level */
427 enum pipe_transfer_usage usage;
428 struct pipe_box box; /**< region of the resource to access */
429 unsigned stride; /**< row stride in bytes */
430 unsigned layer_stride; /**< image/layer stride in bytes */
436 * A vertex buffer. Typically, all the vertex data/attributes for
437 * drawing something will be in one buffer. But it's also possible, for
438 * example, to put colors in one buffer and texcoords in another.
440 struct pipe_vertex_buffer
442 unsigned stride; /**< stride to same attrib in next vertex, in bytes */
443 unsigned buffer_offset; /**< offset to start of data in buffer, in bytes */
444 struct pipe_resource *buffer; /**< the actual buffer */
445 const void *user_buffer; /**< pointer to a user buffer if buffer == NULL */
450 * A constant buffer. A subrange of an existing buffer can be set
451 * as a constant buffer.
453 struct pipe_constant_buffer {
454 struct pipe_resource *buffer; /**< the actual buffer */
455 unsigned buffer_offset; /**< offset to start of data in buffer, in bytes */
456 unsigned buffer_size; /**< how much data can be read in shader */
457 const void *user_buffer; /**< pointer to a user buffer if buffer == NULL */
462 * A stream output target. The structure specifies the range vertices can
465 * In addition to that, the structure should internally maintain the offset
466 * into the buffer, which should be incremented everytime something is written
467 * (appended) to it. The internal offset is buffer_offset + how many bytes
468 * have been written. The internal offset can be stored on the device
469 * and the CPU actually doesn't have to query it.
471 * Use PIPE_QUERY_SO_STATISTICS to know how many primitives have
472 * actually been written.
474 struct pipe_stream_output_target
476 struct pipe_reference reference;
477 struct pipe_resource *buffer; /**< the output buffer */
478 struct pipe_context *context; /**< context this SO target belongs to */
480 unsigned buffer_offset; /**< offset where data should be written, in bytes */
481 unsigned buffer_size; /**< how much data is allowed to be written */
486 * Information to describe a vertex attribute (position, color, etc)
488 struct pipe_vertex_element
490 /** Offset of this attribute, in bytes, from the start of the vertex */
493 /** Instance data rate divisor. 0 means this is per-vertex data,
494 * n means per-instance data used for n consecutive instances (n > 0).
496 unsigned instance_divisor;
498 /** Which vertex_buffer (as given to pipe->set_vertex_buffer()) does
499 * this attribute live in?
501 unsigned vertex_buffer_index;
503 enum pipe_format src_format;
508 * An index buffer. When an index buffer is bound, all indices to vertices
509 * will be looked up in the buffer.
511 struct pipe_index_buffer
513 unsigned index_size; /**< size of an index, in bytes */
514 unsigned offset; /**< offset to start of data in buffer, in bytes */
515 struct pipe_resource *buffer; /**< the actual buffer */
516 const void *user_buffer; /**< pointer to a user buffer if buffer == NULL */
521 * Information to describe a draw_vbo call.
523 struct pipe_draw_info
525 boolean indexed; /**< use index buffer */
527 unsigned mode; /**< the mode of the primitive */
528 unsigned start; /**< the index of the first vertex */
529 unsigned count; /**< number of vertices */
531 unsigned start_instance; /**< first instance id */
532 unsigned instance_count; /**< number of instances */
535 * For indexed drawing, these fields apply after index lookup.
537 int index_bias; /**< a bias to be added to each index */
538 unsigned min_index; /**< the min index */
539 unsigned max_index; /**< the max index */
542 * Primitive restart enable/index (only applies to indexed drawing)
544 boolean primitive_restart;
545 unsigned restart_index;
548 * Stream output target. If not NULL, it's used to provide the 'count'
549 * parameter based on the number vertices captured by the stream output
550 * stage. (or generally, based on the number of bytes captured)
552 * Only 'mode', 'start_instance', and 'instance_count' are taken into
553 * account, all the other variables from pipe_draw_info are ignored.
555 * 'start' is implicitly 0 and 'count' is set as discussed above.
556 * The draw command is non-indexed.
558 * Note that this only provides the count. The vertex buffers must
559 * be set via set_vertex_buffers manually.
561 struct pipe_stream_output_target *count_from_stream_output;
566 * Information to describe a blit call.
568 struct pipe_blit_info
571 struct pipe_resource *resource;
573 struct pipe_box box; /**< negative width, height only legal for src */
574 /* For pipe_surface-like format casting: */
575 enum pipe_format format; /**< must be supported for sampling (src)
576 or rendering (dst), ZS is always supported */
579 unsigned mask; /**< bitmask of PIPE_MASK_R/G/B/A/Z/S */
580 unsigned filter; /**< PIPE_TEX_FILTER_* */
582 boolean scissor_enable;
583 struct pipe_scissor_state scissor;
588 * Structure used as a header for serialized LLVM programs.
590 struct pipe_llvm_program_header
592 uint32_t num_bytes; /**< Number of bytes in the LLVM bytecode program. */
595 struct pipe_compute_state
597 const void *prog; /**< Compute program to be executed. */
598 unsigned req_local_mem; /**< Required size of the LOCAL resource. */
599 unsigned req_private_mem; /**< Required size of the PRIVATE resource. */
600 unsigned req_input_mem; /**< Required size of the INPUT resource. */