src/gallium/auxiliary/draw/draw_gs.h

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   3  * Copyright 2009 VMware, Inc.
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  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
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  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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  27
  28 #ifndef DRAW_GS_H
  29 #define DRAW_GS_H
  30
  31 #include "draw_context.h"
  32 #include "tgsi/tgsi_exec.h"
  33 #include "draw_private.h"
  34
  35 #define MAX_TGSI_PRIMITIVES 4
  36
  37 struct draw_context;
  38
  39 #ifdef HAVE_LLVM
  40 struct draw_gs_jit_context;
  41 struct draw_gs_llvm_variant;
  42
  43 /**
  44  * Structure holding the inputs to the geometry shader. It uses SOA layout.
  45  * The dimensions are as follows:
  46  * - maximum number of vertices for a geometry shader input primitive
  47  *   (6 for triangle_adjacency)
  48  * - maximum number of attributes for each vertex
  49  * - four channels per each attribute (x,y,z,w)
  50  * - number of input primitives equal to the SOA vector length
  51  */
  52 struct draw_gs_inputs {
  53    float data[6][PIPE_MAX_SHADER_INPUTS][TGSI_NUM_CHANNELS][TGSI_NUM_CHANNELS];
  54 };
  55 #endif
  56
  57 /**
  58  * Private version of the compiled geometry shader
  59  */
  60 struct draw_geometry_shader {
  61    struct draw_context *draw;
  62
  63    struct tgsi_exec_machine *machine;
  64
  65    /* This member will disappear shortly:*/
  66    struct pipe_shader_state state;
  67
  68    struct tgsi_shader_info info;
  69    unsigned position_output;
  70    unsigned viewport_index_output;
  71    unsigned clipdistance_output[PIPE_MAX_CLIP_OR_CULL_DISTANCE_ELEMENT_COUNT];
  72    unsigned culldistance_output[PIPE_MAX_CLIP_OR_CULL_DISTANCE_ELEMENT_COUNT];
  73
  74    unsigned max_output_vertices;
  75    unsigned primitive_boundary;
  76    unsigned input_primitive;
  77    unsigned output_primitive;
  78
  79    unsigned *primitive_lengths;
  80    unsigned emitted_vertices;
  81    unsigned emitted_primitives;
  82
  83    float (*tmp_output)[4];
  84    unsigned vertex_size;
  85
  86    unsigned in_prim_idx;
  87    unsigned input_vertex_stride;
  88    unsigned fetched_prim_count;
  89    const float (*input)[4];
  90    const struct tgsi_shader_info *input_info;
  91    unsigned vector_length;
  92    unsigned max_out_prims;
  93
  94    unsigned num_invocations;
  95    unsigned invocation_id;
  96 #ifdef HAVE_LLVM
  97    struct draw_gs_inputs *gs_input;
  98    struct draw_gs_jit_context *jit_context;
  99    struct draw_gs_llvm_variant *current_variant;
 100    struct vertex_header *gs_output;
 101
 102    int **llvm_prim_lengths;
 103    int *llvm_emitted_primitives;
 104    int *llvm_emitted_vertices;
 105    int *llvm_prim_ids;
 106 #endif
 107
 108    void (*fetch_inputs)(struct draw_geometry_shader *shader,
 109                         unsigned *indices,
 110                         unsigned num_vertices,
 111                         unsigned prim_idx);
 112    void (*fetch_outputs)(struct draw_geometry_shader *shader,
 113                          unsigned num_primitives,
 114                          float (**p_output)[4]);
 115
 116    void     (*prepare)(struct draw_geometry_shader *shader,
 117                        const void *constants[PIPE_MAX_CONSTANT_BUFFERS],
 118                        const unsigned constants_size[PIPE_MAX_CONSTANT_BUFFERS]);
 119    unsigned (*run)(struct draw_geometry_shader *shader,
 120                    unsigned input_primitives);
 121 };
 122
 123 void draw_geometry_shader_new_instance(struct draw_geometry_shader *gs);
 124
 125 /*
 126  * Returns the number of vertices emitted.
 127  * The vertex shader can emit any number of vertices as long as it's
 128  * smaller than the GS_MAX_OUTPUT_VERTICES shader property.
 129  */
 130 int draw_geometry_shader_run(struct draw_geometry_shader *shader,
 131                              const void *constants[PIPE_MAX_CONSTANT_BUFFERS],
 132                              const unsigned constants_size[PIPE_MAX_CONSTANT_BUFFERS],
 133                              const struct draw_vertex_info *input_verts,
 134                              const struct draw_prim_info *input_prim,
 135                              const struct tgsi_shader_info *input_info,
 136                              struct draw_vertex_info *output_verts,
 137                              struct draw_prim_info *output_prims );
 138
 139 void draw_geometry_shader_prepare(struct draw_geometry_shader *shader,
 140                                   struct draw_context *draw);
 141
 142 int draw_gs_max_output_vertices(struct draw_geometry_shader *shader,
 143                                 unsigned pipe_prim);
 144
 145 #ifdef HAVE_LLVM
 146 void draw_gs_set_current_variant(struct draw_geometry_shader *shader,
 147                                  struct draw_gs_llvm_variant *variant);
 148 #endif
 149
 150 #endif