src/video/sdl/sdl_lightmap.cpp

   1 //  SuperTux
   2 //  Copyright (C) 2006 Matthias Braun <matze@braunis.de>
   3 //
   4 //  This program is free software: you can redistribute it and/or modify
   5 //  it under the terms of the GNU General Public License as published by
   6 //  the Free Software Foundation, either version 3 of the License, or
   7 //  (at your option) any later version.
   8 //
   9 //  This program is distributed in the hope that it will be useful,
  10 //  but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 //  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 //  GNU General Public License for more details.
  13 //
  14 //  You should have received a copy of the GNU General Public License
  15 //  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16
  17 #include <iostream>
  18
  19 #include "video/sdl/sdl_lightmap.hpp"
  20 #include "video/sdl/sdl_surface_data.hpp"
  21 #include "video/sdl/sdl_texture.hpp"
  22 #include "video/sdl/sdl_renderer.hpp"
  23 #include "video/sdl/sdl_painter.hpp"
  24
  25 SDLLightmap::SDLLightmap() :
  26   m_renderer(static_cast<SDLRenderer&>(VideoSystem::current()->get_renderer()).get_sdl_renderer()),
  27   m_texture(),
  28   m_width(),
  29   m_height(),
  30   m_LIGHTMAP_DIV()
  31 {
  32   m_LIGHTMAP_DIV = 5;
  33
  34   m_width = SCREEN_WIDTH;
  35   m_height = SCREEN_HEIGHT;
  36
  37   m_texture = SDL_CreateTexture(m_renderer,
  38                                 SDL_PIXELFORMAT_RGB888,
  39                                 SDL_TEXTUREACCESS_TARGET,
  40                                 m_width / m_LIGHTMAP_DIV,
  41                                 m_height / m_LIGHTMAP_DIV);
  42   if (!m_texture)
  43   {
  44     std::stringstream msg;
  45     msg << "Couldn't create lightmap texture: " << SDL_GetError();
  46     throw std::runtime_error(msg.str());
  47   }
  48 }
  49
  50 SDLLightmap::~SDLLightmap()
  51 {
  52   SDL_DestroyTexture(m_texture);
  53 }
  54
  55 void
  56 SDLLightmap::start_draw(const Color &ambient_color)
  57 {
  58   SDL_SetRenderTarget(m_renderer, m_texture);
  59
  60   Uint8 r = static_cast<Uint8>(ambient_color.red * 255);
  61   Uint8 g = static_cast<Uint8>(ambient_color.green * 255);
  62   Uint8 b = static_cast<Uint8>(ambient_color.blue * 255);
  63
  64   SDL_SetRenderDrawColor(m_renderer, r, g, b, 255);
  65   SDL_RenderClear(m_renderer);
  66   SDL_RenderSetScale(m_renderer, 1.0f / m_LIGHTMAP_DIV, 1.0f / m_LIGHTMAP_DIV);
  67 }
  68
  69 void
  70 SDLLightmap::end_draw()
  71 {
  72   SDL_RenderSetScale(m_renderer, 1.0f, 1.0f);
  73   SDL_SetRenderTarget(m_renderer, NULL);
  74 }
  75
  76 void
  77 SDLLightmap::do_draw()
  78 {
  79   SDL_SetTextureBlendMode(m_texture, SDL_BLENDMODE_MOD);
  80
  81   SDL_Rect dst_rect;
  82   dst_rect.x = 0;
  83   dst_rect.y = 0;
  84   dst_rect.w = m_width;
  85   dst_rect.h = m_height;
  86
  87   SDL_RenderCopy(m_renderer, m_texture, NULL, &dst_rect);
  88 }
  89
  90 void
  91 SDLLightmap::draw_surface(const DrawingRequest& request)
  92 {
  93   SDLPainter::draw_surface(m_renderer, request);
  94 }
  95
  96 void
  97 SDLLightmap::draw_surface_part(const DrawingRequest& request)
  98 {
  99   SDLPainter::draw_surface_part(m_renderer, request);
 100 }
 101
 102 void
 103 SDLLightmap::draw_gradient(const DrawingRequest& request)
 104 {
 105   SDLPainter::draw_gradient(m_renderer, request);
 106 }
 107
 108 void
 109 SDLLightmap::draw_filled_rect(const DrawingRequest& request)
 110 {
 111   SDLPainter::draw_filled_rect(m_renderer, request);
 112 }
 113
 114 void
 115 SDLLightmap::get_light(const DrawingRequest& request) const
 116 {
 117   const GetLightRequest* getlightrequest
 118     = static_cast<GetLightRequest*>(request.request_data);
 119
 120   SDL_Rect rect;
 121   rect.x = static_cast<int>(request.pos.x / m_LIGHTMAP_DIV);
 122   rect.y = static_cast<int>((m_height - request.pos.y) / m_LIGHTMAP_DIV);
 123   rect.w = 1;
 124   rect.h = 1;
 125
 126   SDL_SetRenderTarget(m_renderer, m_texture);
 127   Uint8 pixel[4];
 128   int ret = SDL_RenderReadPixels(m_renderer, &rect,
 129                                  SDL_PIXELFORMAT_RGB888,
 130                                  pixel,
 131                                  1);
 132   if (ret != 0)
 133   {
 134     log_warning << "failed to read pixels: " << SDL_GetError() << std::endl;
 135   }
 136   SDL_SetRenderTarget(m_renderer, 0);
 137
 138   *(getlightrequest->color_ptr) = Color(pixel[2] / 255.0f,
 139                                         pixel[1] / 255.0f,
 140                                         pixel[0] / 255.0f);
 141 }
 142
 143 /* EOF */