/**************************************************************************
*
* Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sub license, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial portions
* of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
* IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
* ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
**************************************************************************/
/**
* @file
*
* Abstract graphics pipe state objects.
*
* Basic notes:
* 1. Want compact representations, so we use bitfields.
* 2. Put bitfields before other (GLfloat) fields.
*/
#ifndef PIPE_STATE_H
#define PIPE_STATE_H
#include "p_compiler.h"
#include "p_defines.h"
#include "p_format.h"
#ifdef __cplusplus
extern "C" {
#endif
/**
* Implementation limits
*/
#define PIPE_MAX_ATTRIBS 32
#define PIPE_MAX_CLIP_PLANES 8
#define PIPE_MAX_COLOR_BUFS 8
#define PIPE_MAX_CONSTANT_BUFFERS 32
#define PIPE_MAX_SAMPLERS 16
#define PIPE_MAX_SHADER_INPUTS 32
#define PIPE_MAX_SHADER_OUTPUTS 48 /* 32 GENERICs + POS, PSIZE, FOG, etc. */
#define PIPE_MAX_SHADER_SAMPLER_VIEWS 32
#define PIPE_MAX_SHADER_RESOURCES 32
#define PIPE_MAX_TEXTURE_LEVELS 16
#define PIPE_MAX_SO_BUFFERS 4
#define PIPE_MAX_SO_OUTPUTS 64
#define PIPE_MAX_VIEWPORTS 16
#define PIPE_MAX_CLIP_OR_CULL_DISTANCE_COUNT 8
#define PIPE_MAX_CLIP_OR_CULL_DISTANCE_ELEMENT_COUNT 2
struct pipe_reference
{
int32_t count; /* atomic */
};
/**
* Primitive (point/line/tri) rasterization info
*/
struct pipe_rasterizer_state
{
unsigned flatshade:1;
unsigned light_twoside:1;
unsigned clamp_vertex_color:1;
unsigned clamp_fragment_color:1;
unsigned front_ccw:1;
unsigned cull_face:2; /**< PIPE_FACE_x */
unsigned fill_front:2; /**< PIPE_POLYGON_MODE_x */
unsigned fill_back:2; /**< PIPE_POLYGON_MODE_x */
unsigned offset_point:1;
unsigned offset_line:1;
unsigned offset_tri:1;
unsigned scissor:1;
unsigned poly_smooth:1;
unsigned poly_stipple_enable:1;
unsigned point_smooth:1;
unsigned sprite_coord_mode:1; /**< PIPE_SPRITE_COORD_ */
unsigned point_quad_rasterization:1; /** points rasterized as quads or points */
unsigned point_size_per_vertex:1; /**< size computed in vertex shader */
unsigned multisample:1; /* XXX maybe more ms state in future */
unsigned line_smooth:1;
unsigned line_stipple_enable:1;
unsigned line_last_pixel:1;
/**
* Use the first vertex of a primitive as the provoking vertex for
* flat shading.
*/
unsigned flatshade_first:1;
unsigned half_pixel_center:1;
unsigned bottom_edge_rule:1;
/**
* When true, rasterization is disabled and no pixels are written.
* This only makes sense with the Stream Out functionality.
*/
unsigned rasterizer_discard:1;
/**
* When false, depth clipping is disabled and the depth value will be
* clamped later at the per-pixel level before depth testing.
* This depends on PIPE_CAP_DEPTH_CLIP_DISABLE.
*/
unsigned depth_clip:1;
/**
* When true clip space in the z axis goes from [0..1] (D3D). When false
* [-1, 1] (GL).
*/
unsigned clip_halfz:1;
/**
* Enable bits for clipping half-spaces.
* This applies to both user clip planes and shader clip distances.
* Note that if the bound shader exports any clip distances, these
* replace all user clip planes, and clip half-spaces enabled here
* but not written by the shader count as disabled.
*/
unsigned clip_plane_enable:PIPE_MAX_CLIP_PLANES;
unsigned line_stipple_factor:8; /**< [1..256] actually */
unsigned line_stipple_pattern:16;
uint32_t sprite_coord_enable; /* referring to 32 TEXCOORD/GENERIC inputs */
float line_width;
float point_size; /**< used when no per-vertex size */
float offset_units;
float offset_scale;
float offset_clamp;
};
struct pipe_poly_stipple
{
unsigned stipple[32];
};
struct pipe_viewport_state
{
float scale[4];
float translate[4];
};
struct pipe_scissor_state
{
unsigned minx:16;
unsigned miny:16;
unsigned maxx:16;
unsigned maxy:16;
};
struct pipe_clip_state
{
float ucp[PIPE_MAX_CLIP_PLANES][4];
};
/**
* Stream output for vertex transform feedback.
*/
struct pipe_stream_output_info
{
unsigned num_outputs;
/** stride for an entire vertex for each buffer in dwords */
unsigned stride[PIPE_MAX_SO_BUFFERS];
/**
* Array of stream outputs, in the order they are to be written in.
* Selected components are tightly packed into the output buffer.
*/
struct {
unsigned register_index:8; /**< 0 to PIPE_MAX_SHADER_OUTPUTS */
unsigned start_component:2; /** 0 to 3 */
unsigned num_components:3; /** 1 to 4 */
unsigned output_buffer:3; /**< 0 to PIPE_MAX_SO_BUFFERS */
unsigned dst_offset:16; /**< offset into the buffer in dwords */
} output[PIPE_MAX_SO_OUTPUTS];
};
struct pipe_shader_state
{
const struct tgsi_token *tokens;
struct pipe_stream_output_info stream_output;
};
struct pipe_depth_state
{
unsigned enabled:1; /**< depth test enabled? */
unsigned writemask:1; /**< allow depth buffer writes? */
unsigned func:3; /**< depth test func (PIPE_FUNC_x) */
};
struct pipe_stencil_state
{
unsigned enabled:1; /**< stencil[0]: stencil enabled, stencil[1]: two-side enabled */
unsigned func:3; /**< PIPE_FUNC_x */
unsigned fail_op:3; /**< PIPE_STENCIL_OP_x */
unsigned zpass_op:3; /**< PIPE_STENCIL_OP_x */
unsigned zfail_op:3; /**< PIPE_STENCIL_OP_x */
unsigned valuemask:8;
unsigned writemask:8;
};
struct pipe_alpha_state
{
unsigned enabled:1;
unsigned func:3; /**< PIPE_FUNC_x */
float ref_value; /**< reference value */
};
struct pipe_depth_stencil_alpha_state
{
struct pipe_depth_state depth;
struct pipe_stencil_state stencil[2]; /**< [0] = front, [1] = back */
struct pipe_alpha_state alpha;
};
struct pipe_rt_blend_state
{
unsigned blend_enable:1;
unsigned rgb_func:3; /**< PIPE_BLEND_x */
unsigned rgb_src_factor:5; /**< PIPE_BLENDFACTOR_x */
unsigned rgb_dst_factor:5; /**< PIPE_BLENDFACTOR_x */
unsigned alpha_func:3; /**< PIPE_BLEND_x */
unsigned alpha_src_factor:5; /**< PIPE_BLENDFACTOR_x */
unsigned alpha_dst_factor:5; /**< PIPE_BLENDFACTOR_x */
unsigned colormask:4; /**< bitmask of PIPE_MASK_R/G/B/A */
};
struct pipe_blend_state
{
unsigned independent_blend_enable:1;
unsigned logicop_enable:1;
unsigned logicop_func:4; /**< PIPE_LOGICOP_x */
unsigned dither:1;
unsigned alpha_to_coverage:1;
unsigned alpha_to_one:1;
struct pipe_rt_blend_state rt[PIPE_MAX_COLOR_BUFS];
};
struct pipe_blend_color
{
float color[4];
};
struct pipe_stencil_ref
{
ubyte ref_value[2];
};
struct pipe_framebuffer_state
{
unsigned width, height;
/** multiple color buffers for multiple render targets */
unsigned nr_cbufs;
struct pipe_surface *cbufs[PIPE_MAX_COLOR_BUFS];
struct pipe_surface *zsbuf; /**< Z/stencil buffer */
};
/**
* Texture sampler state.
*/
struct pipe_sampler_state
{
unsigned wrap_s:3; /**< PIPE_TEX_WRAP_x */
unsigned wrap_t:3; /**< PIPE_TEX_WRAP_x */
unsigned wrap_r:3; /**< PIPE_TEX_WRAP_x */
unsigned min_img_filter:2; /**< PIPE_TEX_FILTER_x */
unsigned min_mip_filter:2; /**< PIPE_TEX_MIPFILTER_x */
unsigned mag_img_filter:2; /**< PIPE_TEX_FILTER_x */
unsigned compare_mode:1; /**< PIPE_TEX_COMPARE_x */
unsigned compare_func:3; /**< PIPE_FUNC_x */
unsigned normalized_coords:1; /**< Are coords normalized to [0,1]? */
unsigned max_anisotropy:6;
unsigned seamless_cube_map:1;
float lod_bias; /**< LOD/lambda bias */
float min_lod, max_lod; /**< LOD clamp range, after bias */
union pipe_color_union border_color;
};
/**
* A view into a texture that can be bound to a color render target /
* depth stencil attachment point.
*/
struct pipe_surface
{
struct pipe_reference reference;
struct pipe_resource *texture; /**< resource into which this is a view */
struct pipe_context *context; /**< context this surface belongs to */
enum pipe_format format;
/* XXX width/height should be removed */
unsigned width; /**< logical width in pixels */
unsigned height; /**< logical height in pixels */
unsigned writable:1; /**< writable shader resource */
union {
struct {
unsigned level;
unsigned first_layer:16;
unsigned last_layer:16;
} tex;
struct {
unsigned first_element;
unsigned last_element;
} buf;
} u;
};
/**
* A view into a texture that can be bound to a shader stage.
*/
struct pipe_sampler_view
{
struct pipe_reference reference;
enum pipe_format format; /**< typed PIPE_FORMAT_x */
struct pipe_resource *texture; /**< texture into which this is a view */
struct pipe_context *context; /**< context this view belongs to */
union {
struct {
unsigned first_layer:16; /**< first layer to use for array textures */
unsigned last_layer:16; /**< last layer to use for array textures */
unsigned first_level:8; /**< first mipmap level to use */
unsigned last_level:8; /**< last mipmap level to use */
} tex;
struct {
unsigned first_element;
unsigned last_element;
} buf;
} u;
unsigned swizzle_r:3; /**< PIPE_SWIZZLE_x for red component */
unsigned swizzle_g:3; /**< PIPE_SWIZZLE_x for green component */
unsigned swizzle_b:3; /**< PIPE_SWIZZLE_x for blue component */
unsigned swizzle_a:3; /**< PIPE_SWIZZLE_x for alpha component */
};
/**
* Subregion of 1D/2D/3D image resource.
*/
struct pipe_box
{
int x;
int y;
int z;
int width;
int height;
int depth;
};
/**
* A memory object/resource such as a vertex buffer or texture.
*/
struct pipe_resource
{
struct pipe_reference reference;
struct pipe_screen *screen; /**< screen that this texture belongs to */
enum pipe_texture_target target; /**< PIPE_TEXTURE_x */
enum pipe_format format; /**< PIPE_FORMAT_x */
unsigned width0;
unsigned height0;
unsigned depth0;
unsigned array_size;
unsigned last_level:8; /**< Index of last mipmap level present/defined */
unsigned nr_samples:8; /**< for multisampled surfaces, nr of samples */
unsigned usage:8; /**< PIPE_USAGE_x (not a bitmask) */
unsigned bind; /**< bitmask of PIPE_BIND_x */
unsigned flags; /**< bitmask of PIPE_RESOURCE_FLAG_x */
};
/**
* Transfer object. For data transfer to/from a resource.
*/
struct pipe_transfer
{
struct pipe_resource *resource; /**< resource to transfer to/from */
unsigned level; /**< texture mipmap level */
enum pipe_transfer_usage usage;
struct pipe_box box; /**< region of the resource to access */
unsigned stride; /**< row stride in bytes */
unsigned layer_stride; /**< image/layer stride in bytes */
};
/**
* A vertex buffer. Typically, all the vertex data/attributes for
* drawing something will be in one buffer. But it's also possible, for
* example, to put colors in one buffer and texcoords in another.
*/
struct pipe_vertex_buffer
{
unsigned stride; /**< stride to same attrib in next vertex, in bytes */
unsigned buffer_offset; /**< offset to start of data in buffer, in bytes */
struct pipe_resource *buffer; /**< the actual buffer */
const void *user_buffer; /**< pointer to a user buffer if buffer == NULL */
};
/**
* A constant buffer. A subrange of an existing buffer can be set
* as a constant buffer.
*/
struct pipe_constant_buffer {
struct pipe_resource *buffer; /**< the actual buffer */
unsigned buffer_offset; /**< offset to start of data in buffer, in bytes */
unsigned buffer_size; /**< how much data can be read in shader */
const void *user_buffer; /**< pointer to a user buffer if buffer == NULL */
};
/**
* A stream output target. The structure specifies the range vertices can
* be written to.
*
* In addition to that, the structure should internally maintain the offset
* into the buffer, which should be incremented everytime something is written
* (appended) to it. The internal offset is buffer_offset + how many bytes
* have been written. The internal offset can be stored on the device
* and the CPU actually doesn't have to query it.
*
* Note that the buffer_size variable is actually specifying the available
* space in the buffer, not the size of the attached buffer.
* In other words in majority of cases buffer_size would simply be
* 'buffer->width0 - buffer_offset', so buffer_size refers to the size
* of the buffer left, after accounting for buffer offset, for stream output
* to write to.
*
* Use PIPE_QUERY_SO_STATISTICS to know how many primitives have
* actually been written.
*/
struct pipe_stream_output_target
{
struct pipe_reference reference;
struct pipe_resource *buffer; /**< the output buffer */
struct pipe_context *context; /**< context this SO target belongs to */
unsigned buffer_offset; /**< offset where data should be written, in bytes */
unsigned buffer_size; /**< how much data is allowed to be written */
};
/**
* Information to describe a vertex attribute (position, color, etc)
*/
struct pipe_vertex_element
{
/** Offset of this attribute, in bytes, from the start of the vertex */
unsigned src_offset;
/** Instance data rate divisor. 0 means this is per-vertex data,
* n means per-instance data used for n consecutive instances (n > 0).
*/
unsigned instance_divisor;
/** Which vertex_buffer (as given to pipe->set_vertex_buffer()) does
* this attribute live in?
*/
unsigned vertex_buffer_index;
enum pipe_format src_format;
};
/**
* An index buffer. When an index buffer is bound, all indices to vertices
* will be looked up in the buffer.
*/
struct pipe_index_buffer
{
unsigned index_size; /**< size of an index, in bytes */
unsigned offset; /**< offset to start of data in buffer, in bytes */
struct pipe_resource *buffer; /**< the actual buffer */
const void *user_buffer; /**< pointer to a user buffer if buffer == NULL */
};
/**
* Information to describe a draw_vbo call.
*/
struct pipe_draw_info
{
boolean indexed; /**< use index buffer */
unsigned mode; /**< the mode of the primitive */
unsigned start; /**< the index of the first vertex */
unsigned count; /**< number of vertices */
unsigned start_instance; /**< first instance id */
unsigned instance_count; /**< number of instances */
/**
* For indexed drawing, these fields apply after index lookup.
*/
int index_bias; /**< a bias to be added to each index */
unsigned min_index; /**< the min index */
unsigned max_index; /**< the max index */
/**
* Primitive restart enable/index (only applies to indexed drawing)
*/
boolean primitive_restart;
unsigned restart_index;
/**
* Stream output target. If not NULL, it's used to provide the 'count'
* parameter based on the number vertices captured by the stream output
* stage. (or generally, based on the number of bytes captured)
*
* Only 'mode', 'start_instance', and 'instance_count' are taken into
* account, all the other variables from pipe_draw_info are ignored.
*
* 'start' is implicitly 0 and 'count' is set as discussed above.
* The draw command is non-indexed.
*
* Note that this only provides the count. The vertex buffers must
* be set via set_vertex_buffers manually.
*/
struct pipe_stream_output_target *count_from_stream_output;
};
/**
* Information to describe a blit call.
*/
struct pipe_blit_info
{
struct {
struct pipe_resource *resource;
unsigned level;
struct pipe_box box; /**< negative width, height only legal for src */
/* For pipe_surface-like format casting: */
enum pipe_format format; /**< must be supported for sampling (src)
or rendering (dst), ZS is always supported */
} dst, src;
unsigned mask; /**< bitmask of PIPE_MASK_R/G/B/A/Z/S */
unsigned filter; /**< PIPE_TEX_FILTER_* */
boolean scissor_enable;
struct pipe_scissor_state scissor;
};
/**
* Structure used as a header for serialized LLVM programs.
*/
struct pipe_llvm_program_header
{
uint32_t num_bytes; /**< Number of bytes in the LLVM bytecode program. */
};
struct pipe_compute_state
{
const void *prog; /**< Compute program to be executed. */
unsigned req_local_mem; /**< Required size of the LOCAL resource. */
unsigned req_private_mem; /**< Required size of the PRIVATE resource. */
unsigned req_input_mem; /**< Required size of the INPUT resource. */
};
#ifdef __cplusplus
}
#endif
#endif