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
  32 using namespace irr;
  33
  34 SCM
  35 IVideoDriver_beginScene (SCM video_driver,
  36                          SCM back_buffer,
  37                          SCM z_buffer,
  38                          SCM color,
  39                          SCM video_data,
  40                          SCM source_rect)
  41 {
  42   video::IVideoDriver* driver = (video::IVideoDriver*) scm_to_pointer (video_driver);
  43
  44   // Source rect
  45   core::rect<s32>* sourceRectAddress = 0;
  46   if (!scm_is_false (source_rect))
  47     {
  48       core::rect<s32> sourceRect = scm_to_rect_s32 (source_rect);
  49       sourceRectAddress = &sourceRect;
  50     }
  51
  52   return scm_from_bool (driver->beginScene (scm_to_bool (back_buffer),
  53                                             scm_to_bool (z_buffer),
  54                                             scm_to_color (color),
  55                                             video::SExposedVideoData (),
  56                                             sourceRectAddress));
  57 }
  58
  59 SCM
  60 IVideoDriver_drawVertexPrimitiveList (SCM video_driver,
  61                                       SCM vertices,
  62                                       SCM indices,
  63                                       SCM v_type,
  64                                       SCM p_type)
  65 {
  66   // Build vertex array
  67   u32 vertex_count = scm_to_uint32 (scm_length (vertices));
  68   video::S3DVertex s3d_vertices [vertex_count];
  69   for (int i = 0; i < vertex_count; i++)
  70     {
  71       video::S3DVertex* vertex =
  72         (video::S3DVertex*) scm_to_pointer (scm_list_ref (vertices, scm_from_int (i)));
  73       s3d_vertices[i] = video::S3DVertex (vertex->Pos,
  74                                           vertex->Normal,
  75                                           vertex->Color,
  76                                           vertex->TCoords);
  77     }
  78
  79   // Build index array
  80   u32 index_count = scm_to_uint32 (scm_length (indices));
  81   SCM flat_indices = scm_apply_0 (scm_eval_string (scm_from_utf8_string ("append")),
  82                                   indices);
  83   int flat_length = scm_to_int (scm_length (flat_indices));
  84   u32 c_indices [flat_length];
  85   for (int i = 0; i < flat_length; i++)
  86     {
  87       c_indices[i] = scm_to_uint32 (scm_list_ref (flat_indices, scm_from_int (i)));
  88     }
  89
  90   // Draw vertices
  91   video::IVideoDriver* driver = (video::IVideoDriver*) scm_to_pointer (video_driver);
  92   driver->drawVertexPrimitiveList (&s3d_vertices[0],
  93                                    vertex_count,
  94                                    &c_indices[0],
  95                                    index_count,
  96                                    scm_to_vertex_type (v_type),
  97                                    scm_to_primitive_type (p_type),
  98                                    video::EIT_32BIT);
  99   return SCM_UNSPECIFIED;
 100 }
 101
 102 SCM
 103 IVideoDriver_endScene (SCM video_driver)
 104 {
 105   video::IVideoDriver* driver = (video::IVideoDriver*) scm_to_pointer (video_driver);
 106   return scm_from_bool (driver->endScene ());
 107 }
 108
 109 SCM
 110 IVideoDriver_getFPS (SCM video_driver)
 111 {
 112   video::IVideoDriver* driver = (video::IVideoDriver*) scm_to_pointer (video_driver);
 113   return scm_from_int32 (driver->getFPS ());
 114 }
 115
 116 SCM
 117 IVideoDriver_getTexture (SCM video_driver,
 118                          SCM filename)
 119 {
 120   video::IVideoDriver* driver = (video::IVideoDriver*) scm_to_pointer (video_driver);
 121   video::ITexture* texture = driver->getTexture (scm_to_utf8_stringn (filename, NULL));
 122   return scm_from_pointer ((void*) texture, NULL);
 123 }
 124
 125 SCM
 126 IVideoDriver_setMaterial (SCM video_driver,
 127                           SCM material)
 128 {
 129   video::IVideoDriver* driver = (video::IVideoDriver*) scm_to_pointer (video_driver);
 130   driver->setMaterial (*((video::SMaterial*) scm_to_pointer (material)));
 131   return SCM_UNSPECIFIED;
 132 }
 133
 134 SCM
 135 IVideoDriver_setTransform (SCM video_driver,
 136                            SCM state,
 137                            SCM mat)
 138 {
 139   video::IVideoDriver* driver = (video::IVideoDriver*) scm_to_pointer (video_driver);
 140   driver->setTransform (scm_to_transformation_state (state),
 141                         scm_to_matrix4 (mat));
 142   return SCM_UNSPECIFIED;
 143 }
 144
 145
 146 void
 147 init_video_driver (void)
 148 {
 149   DEFINE_GSUBR ("IVideoDriver_beginScene", 6, 0, 0, IVideoDriver_beginScene);
 150   DEFINE_GSUBR ("IVideoDriver_drawVertexPrimitiveList", 5, 0, 1,
 151                 IVideoDriver_drawVertexPrimitiveList);
 152   DEFINE_GSUBR ("IVideoDriver_endScene", 1, 0, 0, IVideoDriver_endScene);
 153   DEFINE_GSUBR ("IVideoDriver_getFPS", 1, 0, 0, IVideoDriver_getFPS);
 154   DEFINE_GSUBR ("IVideoDriver_getTexture", 2, 0, 0, IVideoDriver_getTexture);
 155   DEFINE_GSUBR ("IVideoDriver_setMaterial", 2, 0, 0, IVideoDriver_setMaterial);
 156   DEFINE_GSUBR ("IVideoDriver_setTransform", 3, 0, 0, IVideoDriver_setTransform);
 157 }
 158
 159 video::E_TRANSFORMATION_STATE
 160 scm_to_transformation_state (SCM transformation_state)
 161 {
 162   char* state = scm_to_utf8_stringn (scm_symbol_to_string (transformation_state), NULL);
 163   if (!strcmp (state, "view"))
 164     {
 165       return video::ETS_VIEW;
 166     }
 167   else if (!strcmp (state, "world"))
 168     {
 169       return video::ETS_WORLD;
 170     }
 171   else if (!strcmp (state, "projection"))
 172     {
 173       return video::ETS_PROJECTION;
 174     }
 175   else if (!strcmp (state, "texture0"))
 176     {
 177       return video::ETS_TEXTURE_0;
 178     }
 179   else if (!strcmp (state, "texture1"))
 180     {
 181       return video::ETS_TEXTURE_1;
 182     }
 183   else if (!strcmp (state, "texture2"))
 184     {
 185       return video::ETS_TEXTURE_2;
 186     }
 187   else if (!strcmp (state, "texture3"))
 188     {
 189       return video::ETS_TEXTURE_3;
 190     }
 191   else
 192     {
 193       scm_error (scm_arg_type_key, NULL, "Wrong transformation state: ~S",
 194                  scm_list_1 (transformation_state), scm_list_1 (transformation_state));
 195     }
 196 }