src/video-driver.cpp

   1 /* guile-irrlicht --- GNU Guile bindings for Irrlicht Engine
   2
   3    Copyright (C) 2020 Javier Sancho <jsf@jsancho.org>
   4
   5    This file is part of guile-irrlicht.
   6
   7    guile-irrlicht is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU Lesser General Public License as
   9    published by the Free Software Foundation; either version 3 of the
  10    License, or (at your option) any later version.
  11
  12    guile-irrlicht is distributed in the hope that it will be useful, but
  13    WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15    General Public License for more details.
  16
  17    You should have received a copy of the GNU Lesser General Public
  18    License along with guile-irrlicht. If not, see
  19    <http://www.gnu.org/licenses/>.
  20 */
  21
  22 #include <irrlicht/irrlicht.h>
  23 #include <libguile.h>
  24 #include "color.h"
  25 #include "gsubr.h"
  26 #include "matrix4.h"
  27 #include "primitive-types.h"
  28 #include "rect.h"
  29 #include "vertex3d.h"
  30 #include "video-driver.h"
  31 #include "wrapped.h"
  32
  33 using namespace irr;
  34
  35 SCM
  36 IVideoDriver_beginScene (SCM video_driver,
  37                          SCM back_buffer,
  38                          SCM z_buffer,
  39                          SCM color,
  40                          SCM video_data,
  41                          SCM source_rect)
  42 {
  43   video::IVideoDriver* driver = (video::IVideoDriver*) scm_to_irr_pointer (video_driver);
  44
  45   // Source rect
  46   core::rect<s32>* sourceRectAddress = 0;
  47   if (!scm_is_false (source_rect))
  48     {
  49       core::rect<s32> sourceRect = scm_to_rect_s32 (source_rect);
  50       sourceRectAddress = &sourceRect;
  51     }
  52
  53   return scm_from_bool (driver->beginScene (scm_to_bool (back_buffer),
  54                                             scm_to_bool (z_buffer),
  55                                             scm_to_color (color),
  56                                             video::SExposedVideoData (),
  57                                             sourceRectAddress));
  58 }
  59
  60 SCM
  61 IVideoDriver_drawVertexPrimitiveList (SCM video_driver,
  62                                       SCM vertices,
  63                                       SCM indices,
  64                                       SCM v_type,
  65                                       SCM p_type)
  66 {
  67   // Build vertex array
  68   u32 vertex_count = scm_to_uint32 (scm_length (vertices));
  69   video::S3DVertex s3d_vertices [vertex_count];
  70   for (int i = 0; i < vertex_count; i++)
  71     {
  72       video::S3DVertex* vertex =
  73         (video::S3DVertex*) scm_to_irr_pointer (scm_list_ref (vertices, scm_from_int (i)));
  74       s3d_vertices[i] = video::S3DVertex (vertex->Pos,
  75                                           vertex->Normal,
  76                                           vertex->Color,
  77                                           vertex->TCoords);
  78     }
  79
  80   // Build index array
  81   u32 index_count = scm_to_uint32 (scm_length (indices));
  82   SCM flat_indices = scm_apply_0 (scm_eval_string (scm_from_utf8_string ("append")),
  83                                   indices);
  84   int flat_length = scm_to_int (scm_length (flat_indices));
  85   u32 c_indices [flat_length];
  86   for (int i = 0; i < flat_length; i++)
  87     {
  88       c_indices[i] = scm_to_uint32 (scm_list_ref (flat_indices, scm_from_int (i)));
  89     }
  90
  91   // Draw vertices
  92   video::IVideoDriver* driver = (video::IVideoDriver*) scm_to_irr_pointer (video_driver);
  93   driver->drawVertexPrimitiveList (&s3d_vertices[0],
  94                                    vertex_count,
  95                                    &c_indices[0],
  96                                    index_count,
  97                                    scm_to_vertex_type (v_type),
  98                                    scm_to_primitive_type (p_type),
  99                                    video::EIT_32BIT);
 100   return SCM_UNSPECIFIED;
 101 }
 102
 103 SCM
 104 IVideoDriver_endScene (SCM video_driver)
 105 {
 106   video::IVideoDriver* driver = (video::IVideoDriver*) scm_to_irr_pointer (video_driver);
 107   return scm_from_bool (driver->endScene ());
 108 }
 109
 110 SCM
 111 IVideoDriver_getFPS (SCM video_driver)
 112 {
 113   video::IVideoDriver* driver = (video::IVideoDriver*) scm_to_irr_pointer (video_driver);
 114   return scm_from_int32 (driver->getFPS ());
 115 }
 116
 117 SCM
 118 IVideoDriver_getTexture (SCM video_driver,
 119                          SCM filename)
 120 {
 121   video::IVideoDriver* driver = (video::IVideoDriver*) scm_to_irr_pointer (video_driver);
 122   video::ITexture* texture = driver->getTexture (scm_to_utf8_string (filename));
 123   return scm_from_pointer ((void*) texture, NULL);
 124 }
 125
 126 SCM
 127 IVideoDriver_setMaterial (SCM video_driver,
 128                           SCM material)
 129 {
 130   video::IVideoDriver* driver = (video::IVideoDriver*) scm_to_irr_pointer (video_driver);
 131   driver->setMaterial (*((video::SMaterial*) scm_to_irr_pointer (material)));
 132   return SCM_UNSPECIFIED;
 133 }
 134
 135 SCM
 136 IVideoDriver_setTransform (SCM video_driver,
 137                            SCM state,
 138                            SCM mat)
 139 {
 140   video::IVideoDriver* driver = (video::IVideoDriver*) scm_to_irr_pointer (video_driver);
 141   driver->setTransform (scm_to_transformation_state (state),
 142                         scm_to_matrix4 (mat));
 143   return SCM_UNSPECIFIED;
 144 }
 145
 146
 147 void
 148 init_video_driver (void)
 149 {
 150   DEFINE_GSUBR ("IVideoDriver_beginScene", 6, 0, 0, IVideoDriver_beginScene);
 151   DEFINE_GSUBR ("IVideoDriver_drawVertexPrimitiveList", 5, 0, 1,
 152                 IVideoDriver_drawVertexPrimitiveList);
 153   DEFINE_GSUBR ("IVideoDriver_endScene", 1, 0, 0, IVideoDriver_endScene);
 154   DEFINE_GSUBR ("IVideoDriver_getFPS", 1, 0, 0, IVideoDriver_getFPS);
 155   DEFINE_GSUBR ("IVideoDriver_getTexture", 2, 0, 0, IVideoDriver_getTexture);
 156   DEFINE_GSUBR ("IVideoDriver_setMaterial", 2, 0, 0, IVideoDriver_setMaterial);
 157   DEFINE_GSUBR ("IVideoDriver_setTransform", 3, 0, 0, IVideoDriver_setTransform);
 158 }
 159
 160 video::E_TRANSFORMATION_STATE
 161 scm_to_transformation_state (SCM transformation_state)
 162 {
 163   char* state = scm_to_utf8_string (scm_symbol_to_string (transformation_state));
 164   if (!strcmp (state, "view"))
 165     {
 166       return video::ETS_VIEW;
 167     }
 168   else if (!strcmp (state, "world"))
 169     {
 170       return video::ETS_WORLD;
 171     }
 172   else if (!strcmp (state, "projection"))
 173     {
 174       return video::ETS_PROJECTION;
 175     }
 176   else if (!strcmp (state, "texture0"))
 177     {
 178       return video::ETS_TEXTURE_0;
 179     }
 180   else if (!strcmp (state, "texture1"))
 181     {
 182       return video::ETS_TEXTURE_1;
 183     }
 184   else if (!strcmp (state, "texture2"))
 185     {
 186       return video::ETS_TEXTURE_2;
 187     }
 188   else if (!strcmp (state, "texture3"))
 189     {
 190       return video::ETS_TEXTURE_3;
 191     }
 192   else
 193     {
 194       scm_error (scm_arg_type_key, NULL, "Wrong transformation state: ~S",
 195                  scm_list_1 (transformation_state), scm_list_1 (transformation_state));
 196     }
 197 }