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  1. /*
  2.  * Copyright © 2013 Intel Corporation
  3.  *
  4.  * Permission is hereby granted, free of charge, to any person obtaining a
  5.  * copy of this software and associated documentation files (the "Software"),
  6.  * to deal in the Software without restriction, including without limitation
  7.  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  8.  * and/or sell copies of the Software, and to permit persons to whom the
  9.  * Software is furnished to do so, subject to the following conditions:
  10.  *
  11.  * The above copyright notice and this permission notice (including the next
  12.  * paragraph) shall be included in all copies or substantial portions of the
  13.  * Software.
  14.  *
  15.  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16.  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17.  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18.  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19.  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20.  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  21.  * DEALINGS IN THE SOFTWARE.
  22.  */
  23.  
  24. /**
  25.  * \file brw_vec4_gs_visitor.h
  26.  *
  27.  * Geometry-shader-specific code derived from the vec4_visitor class.
  28.  */
  29.  
  30. #ifndef BRW_VEC4_GS_VISITOR_H
  31. #define BRW_VEC4_GS_VISITOR_H
  32.  
  33. #include "brw_vec4.h"
  34.  
  35. /**
  36.  * Scratch data used when compiling a GLSL geometry shader.
  37.  */
  38. struct brw_gs_compile
  39. {
  40.    struct brw_vec4_compile base;
  41.    struct brw_gs_prog_key key;
  42.    struct brw_gs_prog_data prog_data;
  43.    struct brw_vue_map input_vue_map;
  44.  
  45.    struct brw_geometry_program *gp;
  46.  
  47.    unsigned control_data_bits_per_vertex;
  48.    unsigned control_data_header_size_bits;
  49. };
  50.  
  51. #ifdef __cplusplus
  52. extern "C" {
  53. #endif
  54.  
  55. const unsigned *brw_gs_emit(struct brw_context *brw,
  56.                             struct gl_shader_program *prog,
  57.                             struct brw_gs_compile *c,
  58.                             void *mem_ctx,
  59.                             unsigned *final_assembly_size);
  60.  
  61. #ifdef __cplusplus
  62. } /* extern "C" */
  63. #endif
  64.  
  65. #ifdef __cplusplus
  66. namespace brw {
  67.  
  68. class vec4_gs_visitor : public vec4_visitor
  69. {
  70. public:
  71.    vec4_gs_visitor(struct brw_context *brw,
  72.                    struct brw_gs_compile *c,
  73.                    struct gl_shader_program *prog,
  74.                    void *mem_ctx,
  75.                    bool no_spills);
  76.  
  77. protected:
  78.    virtual dst_reg *make_reg_for_system_value(ir_variable *ir);
  79.    virtual void setup_payload();
  80.    virtual void emit_prolog();
  81.    virtual void emit_program_code();
  82.    virtual void emit_thread_end();
  83.    virtual void emit_urb_write_header(int mrf);
  84.    virtual vec4_instruction *emit_urb_write_opcode(bool complete);
  85.    virtual int compute_array_stride(ir_dereference_array *ir);
  86.    virtual void visit(ir_emit_vertex *);
  87.    virtual void visit(ir_end_primitive *);
  88.  
  89. protected:
  90.    int setup_varying_inputs(int payload_reg, int *attribute_map,
  91.                             int attributes_per_reg);
  92.    void emit_control_data_bits();
  93.    void set_stream_control_data_bits(unsigned stream_id);
  94.  
  95.    src_reg vertex_count;
  96.    src_reg control_data_bits;
  97.    const struct brw_gs_compile * const c;
  98. };
  99.  
  100. } /* namespace brw */
  101. #endif /* __cplusplus */
  102.  
  103. #endif /* BRW_VEC4_GS_VISITOR_H */
  104.