src/gallium/auxiliary/draw/draw_gs.h

   1 /**************************************************************************
   2  *
   3  * Copyright 2009 VMware, Inc.
   4  * All Rights Reserved.
   5  *
   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:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  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.
  25  *
  26  **************************************************************************/
  27
  28 #ifndef DRAW_GS_H
  29 #define DRAW_GS_H
  30
  31 #include "draw_context.h"
  32 #include "draw_private.h"
  33
  34 #define MAX_TGSI_PRIMITIVES 4
  35
  36 struct draw_context;
  37
  38 #ifdef HAVE_LLVM
  39 struct draw_gs_jit_context;
  40 struct draw_gs_llvm_variant;
  41
  42 /**
  43  * Structure holding the inputs to the geometry shader. It uses SOA layout.
  44  * The dimensions are as follows:
  45  * - maximum number of vertices for a geometry shader input primitive
  46  *   (6 for triangle_adjacency)
  47  * - maximum number of attributes for each vertex
  48  * - four channels per each attribute (x,y,z,w)
  49  * - number of input primitives equal to the SOA vector length
  50  */
  51 struct draw_gs_inputs {
  52    float data[6][PIPE_MAX_SHADER_INPUTS][TGSI_NUM_CHANNELS][TGSI_NUM_CHANNELS];
  53 };
  54 #endif
  55
  56 /**
  57  * Private version of the compiled geometry shader
  58  */
  59 struct draw_geometry_shader {
  60    struct draw_context *draw;
  61
  62    struct tgsi_exec_machine *machine;
  63
  64    /* This member will disappear shortly:*/
  65    struct pipe_shader_state state;
  66
  67    struct tgsi_shader_info info;
  68    unsigned position_output;
  69    unsigned viewport_index_output;
  70    unsigned clipdistance_output[2];
  71    unsigned culldistance_output[2];
  72
  73    unsigned max_output_vertices;
  74    unsigned primitive_boundary;
  75    unsigned input_primitive;
  76    unsigned output_primitive;
  77
  78    unsigned *primitive_lengths;
  79    unsigned emitted_vertices;
  80    unsigned emitted_primitives;
  81
  82    float (*tmp_output)[4];
  83    unsigned vertex_size;
  84
  85    unsigned in_prim_idx;
  86    unsigned input_vertex_stride;
  87    unsigned fetched_prim_count;
  88    const float (*input)[4];
  89    const struct tgsi_shader_info *input_info;
  90    unsigned vector_length;
  91    unsigned max_out_prims;
  92
  93 #ifdef HAVE_LLVM
  94    struct draw_gs_inputs *gs_input;
  95    struct draw_gs_jit_context *jit_context;
  96    struct draw_gs_llvm_variant *current_variant;
  97    struct vertex_header *gs_output;
  98
  99    int **llvm_prim_lengths;
 100    int *llvm_emitted_primitives;
 101    int *llvm_emitted_vertices;
 102    int *llvm_prim_ids;
 103 #endif
 104
 105    void (*fetch_inputs)(struct draw_geometry_shader *shader,
 106                         unsigned *indices,
 107                         unsigned num_vertices,
 108                         unsigned prim_idx);
 109    void (*fetch_outputs)(struct draw_geometry_shader *shader,
 110                          unsigned num_primitives,
 111                          float (**p_output)[4]);
 112
 113    void     (*prepare)(struct draw_geometry_shader *shader,
 114                        const void *constants[PIPE_MAX_CONSTANT_BUFFERS],
 115                        const unsigned constants_size[PIPE_MAX_CONSTANT_BUFFERS]);
 116    unsigned (*run)(struct draw_geometry_shader *shader,
 117                    unsigned input_primitives);
 118 };
 119
 120 void draw_geometry_shader_new_instance(struct draw_geometry_shader *gs);
 121
 122 /*
 123  * Returns the number of vertices emitted.
 124  * The vertex shader can emit any number of vertices as long as it's
 125  * smaller than the GS_MAX_OUTPUT_VERTICES shader property.
 126  */
 127 int draw_geometry_shader_run(struct draw_geometry_shader *shader,
 128                              const void *constants[PIPE_MAX_CONSTANT_BUFFERS],
 129                              const unsigned constants_size[PIPE_MAX_CONSTANT_BUFFERS],
 130                              const struct draw_vertex_info *input_verts,
 131                              const struct draw_prim_info *input_prim,
 132                              const struct tgsi_shader_info *input_info,
 133                              struct draw_vertex_info *output_verts,
 134                              struct draw_prim_info *output_prims );
 135
 136 void draw_geometry_shader_prepare(struct draw_geometry_shader *shader,
 137                                   struct draw_context *draw);
 138
 139 int draw_gs_max_output_vertices(struct draw_geometry_shader *shader,
 140                                 unsigned pipe_prim);
 141
 142 #ifdef HAVE_LLVM
 143 void draw_gs_set_current_variant(struct draw_geometry_shader *shader,
 144                                  struct draw_gs_llvm_variant *variant);
 145 #endif
 146
 147 #endif