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, height);
  42   if (!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(texture);
  53 }
  54
  55 void
  56 SDLLightmap::start_draw(const Color &ambient_color)
  57 {
  58   SDL_SetRenderTarget(renderer, 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(renderer, r, g, b, 255);
  65   SDL_RenderClear(renderer);
  66 }
  67
  68 void
  69 SDLLightmap::end_draw()
  70 {
  71   SDL_SetRenderTarget(renderer, NULL);
  72 }
  73
  74 void
  75 SDLLightmap::do_draw()
  76 {
  77   SDL_SetTextureBlendMode(texture, SDL_BLENDMODE_MOD);
  78
  79   SDL_Rect dst_rect;
  80   dst_rect.x = 0;
  81   dst_rect.y = 0;
  82   dst_rect.w = width;
  83   dst_rect.h = height;
  84
  85   SDL_RenderCopy(renderer, texture, NULL, &dst_rect);
  86 }
  87
  88 void
  89 SDLLightmap::draw_surface(const DrawingRequest& request)
  90 {
  91   SDLPainter::draw_surface(renderer, request);
  92 }
  93
  94 void
  95 SDLLightmap::draw_surface_part(const DrawingRequest& request)
  96 {
  97   SDLPainter::draw_surface_part(renderer, request);
  98 }
  99
 100 void
 101 SDLLightmap::draw_gradient(const DrawingRequest& request)
 102 {
 103   SDLPainter::draw_gradient(renderer, request);
 104 }
 105
 106 void
 107 SDLLightmap::draw_filled_rect(const DrawingRequest& request)
 108 {
 109   SDLPainter::draw_filled_rect(renderer, request);
 110 }
 111
 112 void
 113 SDLLightmap::get_light(const DrawingRequest& request) const
 114 {
 115   const GetLightRequest* getlightrequest
 116     = (GetLightRequest*) request.request_data;
 117
 118   SDL_Rect rect;
 119   rect.x = static_cast<int>(request.pos.x * width / SCREEN_WIDTH);
 120   rect.y = static_cast<int>(request.pos.y * height / SCREEN_HEIGHT);
 121   rect.w = 1;
 122   rect.h = 1;
 123
 124   SDL_SetRenderTarget(renderer, texture);
 125   Uint8 pixel[4];
 126   int ret = SDL_RenderReadPixels(renderer, &rect,
 127                                  SDL_PIXELFORMAT_RGB888,
 128                                  pixel,
 129                                  1);
 130   if (ret != 0)
 131   {
 132     log_warning << "failed to read pixels: " << SDL_GetError() << std::endl;
 133   }
 134   SDL_SetRenderTarget(renderer, 0);
 135
 136   *(getlightrequest->color_ptr) = Color(pixel[2] / 255.0f,
 137                                         pixel[1] / 255.0f,
 138                                         pixel[0] / 255.0f);
 139 }
 140
 141 /* EOF */