src/mesa/drivers/dri/i965/brw_vec4_gs_visitor.h

   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 struct brw_gs_prog_key
  37 {
  38    struct brw_vec4_prog_key base;
  39
  40    GLbitfield64 input_varyings;
  41 };
  42
  43
  44 /**
  45  * Scratch data used when compiling a GLSL geometry shader.
  46  */
  47 struct brw_gs_compile
  48 {
  49    struct brw_vec4_compile base;
  50    struct brw_gs_prog_key key;
  51    struct brw_gs_prog_data prog_data;
  52    struct brw_vue_map input_vue_map;
  53
  54    struct brw_geometry_program *gp;
  55
  56    unsigned control_data_bits_per_vertex;
  57    unsigned control_data_header_size_bits;
  58 };
  59
  60 #ifdef __cplusplus
  61 extern "C" {
  62 #endif
  63
  64 const unsigned *brw_gs_emit(struct brw_context *brw,
  65                             struct gl_shader_program *prog,
  66                             struct brw_gs_compile *c,
  67                             void *mem_ctx,
  68                             unsigned *final_assembly_size);
  69
  70 #ifdef __cplusplus
  71 } /* extern "C" */
  72 #endif
  73
  74 #ifdef __cplusplus
  75 namespace brw {
  76
  77 class vec4_gs_visitor : public vec4_visitor
  78 {
  79 public:
  80    vec4_gs_visitor(struct brw_context *brw,
  81                    struct brw_gs_compile *c,
  82                    struct gl_shader_program *prog,
  83                    struct brw_shader *shader,
  84                    void *mem_ctx,
  85                    bool no_spills);
  86
  87 protected:
  88    virtual dst_reg *make_reg_for_system_value(ir_variable *ir);
  89    virtual void setup_payload();
  90    virtual void emit_prolog();
  91    virtual void emit_program_code();
  92    virtual void emit_thread_end();
  93    virtual void emit_urb_write_header(int mrf);
  94    virtual vec4_instruction *emit_urb_write_opcode(bool complete);
  95    virtual int compute_array_stride(ir_dereference_array *ir);
  96    virtual void visit(ir_emit_vertex *);
  97    virtual void visit(ir_end_primitive *);
  98
  99 private:
 100    int setup_varying_inputs(int payload_reg, int *attribute_map);
 101    void emit_control_data_bits();
 102
 103    src_reg vertex_count;
 104    src_reg control_data_bits;
 105    const struct brw_gs_compile * const c;
 106 };
 107
 108 } /* namespace brw */
 109 #endif /* __cplusplus */
 110
 111 #endif /* BRW_VEC4_GS_VISITOR_H */