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   renderer(static_cast<SDLRenderer*>(Renderer::instance())->get_sdl_renderer()),
  27   texture(),
  28   width(),
  29   height(),
  30   LIGHTMAP_DIV()
  31 {
  32   LIGHTMAP_DIV = 8;
  33
  34   width = SCREEN_WIDTH;
  35   height = SCREEN_HEIGHT;
  36
  37   SDL_Renderer* renderer = static_cast<SDLRenderer*>(Renderer::instance())->get_sdl_renderer();
  38   texture = SDL_CreateTexture(renderer,
  39                               SDL_PIXELFORMAT_RGB888,
  40                               SDL_TEXTUREACCESS_TARGET,
  41                               width / LIGHTMAP_DIV,
  42                               height / LIGHTMAP_DIV);
  43   if (!texture)
  44   {
  45     std::stringstream msg;
  46     msg << "Couldn't create lightmap texture: " << SDL_GetError();
  47     throw std::runtime_error(msg.str());
  48   }
  49 }
  50
  51 SDLLightmap::~SDLLightmap()
  52 {
  53   SDL_DestroyTexture(texture);
  54 }
  55
  56 void
  57 SDLLightmap::start_draw(const Color &ambient_color)
  58 {
  59   SDL_SetRenderTarget(renderer, texture);
  60
  61   Uint8 r = static_cast<Uint8>(ambient_color.red * 255);
  62   Uint8 g = static_cast<Uint8>(ambient_color.green * 255);
  63   Uint8 b = static_cast<Uint8>(ambient_color.blue * 255);
  64
  65   SDL_SetRenderDrawColor(renderer, r, g, b, 255);
  66   SDL_RenderClear(renderer);
  67   SDL_RenderSetScale(renderer, 1.0f / LIGHTMAP_DIV, 1.0f / LIGHTMAP_DIV);
  68 }
  69
  70 void
  71 SDLLightmap::end_draw()
  72 {
  73   SDL_RenderSetScale(renderer, 1.0f, 1.0f);
  74   SDL_SetRenderTarget(renderer, NULL);
  75 }
  76
  77 void
  78 SDLLightmap::do_draw()
  79 {
  80   SDL_SetTextureBlendMode(texture, SDL_BLENDMODE_MOD);
  81
  82   SDL_Rect dst_rect;
  83   dst_rect.x = 0;
  84   dst_rect.y = 0;
  85   dst_rect.w = width;
  86   dst_rect.h = height;
  87
  88   SDL_RenderCopy(renderer, texture, NULL, &dst_rect);
  89 }
  90
  91 void
  92 SDLLightmap::draw_surface(const DrawingRequest& request)
  93 {
  94   SDLPainter::draw_surface(renderer, request);
  95 }
  96
  97 void
  98 SDLLightmap::draw_surface_part(const DrawingRequest& request)
  99 {
 100   SDLPainter::draw_surface_part(renderer, request);
 101 }
 102
 103 void
 104 SDLLightmap::draw_gradient(const DrawingRequest& request)
 105 {
 106   SDLPainter::draw_gradient(renderer, request);
 107 }
 108
 109 void
 110 SDLLightmap::draw_filled_rect(const DrawingRequest& request)
 111 {
 112   SDLPainter::draw_filled_rect(renderer, request);
 113 }
 114
 115 void
 116 SDLLightmap::get_light(const DrawingRequest& request) const
 117 {
 118   const GetLightRequest* getlightrequest
 119     = (GetLightRequest*) request.request_data;
 120
 121   SDL_Rect rect;
 122   rect.x = static_cast<int>(request.pos.x * width / SCREEN_WIDTH);
 123   rect.y = static_cast<int>(request.pos.y * height / SCREEN_HEIGHT);
 124   rect.w = 1;
 125   rect.h = 1;
 126
 127   SDL_SetRenderTarget(renderer, texture);
 128   Uint8 pixel[4];
 129   int ret = SDL_RenderReadPixels(renderer, &rect,
 130                                  SDL_PIXELFORMAT_RGB888,
 131                                  pixel,
 132                                  1);
 133   if (ret != 0)
 134   {
 135     log_warning << "failed to read pixels: " << SDL_GetError() << std::endl;
 136   }
 137   SDL_SetRenderTarget(renderer, 0);
 138
 139   *(getlightrequest->color_ptr) = Color(pixel[2] / 255.0f,
 140                                         pixel[1] / 255.0f,
 141                                         pixel[0] / 255.0f);
 142 }
 143
 144 /* EOF */