4 #include "SDL_opengl.h"
5 #include <fcntl.h> // for access(2)
6 #include <unistd.h> // for access(2)
13 SDL_Init(SDL_INIT_VIDEO);
14 m_window = SDL_CreateWindow("IPDF", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED,
15 800, 600, SDL_WINDOW_OPENGL | SDL_WINDOW_RESIZABLE);
19 Fatal("Couldn't create window!");
22 m_gl_context = SDL_GL_CreateContext(m_window);
24 ResizeViewport(800, 600);
34 SDL_GL_DeleteContext(m_gl_context);
35 SDL_DestroyWindow(m_window);
39 void Screen::Clear(float r, float g, float b, float a)
41 glClearColor(r,g,b,a);
42 glClear(GL_COLOR_BUFFER_BIT);
45 void Screen::ResizeViewport(int width, int height)
47 glViewport(0, 0, width, height);
48 m_viewport_width = width;
49 m_viewport_height = height;
52 bool Screen::PumpEvents()
55 bool no_quit_requested = true;
56 while (SDL_PollEvent(&evt))
61 no_quit_requested = false;
64 switch (evt.window.event)
66 case SDL_WINDOWEVENT_RESIZED:
67 case SDL_WINDOWEVENT_SIZE_CHANGED:
68 ResizeViewport(evt.window.data1, evt.window.data2);
73 m_last_mouse_x = evt.motion.x;
74 m_last_mouse_y = evt.motion.y;
77 m_mouse_handler(evt.motion.x, evt.motion.y,evt.motion.state, 0);
80 case SDL_MOUSEBUTTONDOWN:
81 case SDL_MOUSEBUTTONUP:
82 m_last_mouse_x = evt.button.x;
83 m_last_mouse_y = evt.button.y;
86 m_mouse_handler(evt.button.x, evt.button.y, evt.button.state, 0);
92 m_mouse_handler(m_last_mouse_x, m_last_mouse_y, 0, evt.wheel.y);
97 Debug("Key %c down", (char)evt.key.keysym.sym);
98 if (isalnum((char)evt.key.keysym.sym))
100 char filename[] = "0.bmp";
101 filename[0] = (char)evt.key.keysym.sym;
102 ScreenShot(filename);
109 return no_quit_requested;
112 void Screen::SetMouseCursor(Screen::MouseCursors cursor)
114 SDL_SystemCursor system_cursor_id = SDL_SYSTEM_CURSOR_ARROW;
117 case CursorArrow: system_cursor_id = SDL_SYSTEM_CURSOR_ARROW; break;
118 case CursorWait: system_cursor_id = SDL_SYSTEM_CURSOR_WAIT; break;
119 case CursorWaitArrow: system_cursor_id = SDL_SYSTEM_CURSOR_WAITARROW; break;
120 case CursorMove: system_cursor_id = SDL_SYSTEM_CURSOR_SIZEALL; break;
121 case CursorHand: system_cursor_id = SDL_SYSTEM_CURSOR_HAND; break;
124 SDL_Cursor *system_cursor = SDL_CreateSystemCursor(system_cursor_id);
125 SDL_SetCursor(system_cursor);
126 //TODO: Check if we need to free the system cursors.
129 void Screen::Present()
131 SDL_GL_SwapWindow(m_window);
134 void Screen::ScreenShot(const char * filename) const
136 Debug("Attempting to save BMP to file %s", filename);
138 int w = ViewportWidth();
139 int h = ViewportHeight();
140 unsigned char * pixels = new unsigned char[w*h*4];
142 Fatal("Failed to allocate %d x %d x 4 = %d pixel array", w, h, w*h*4);
145 for (int y = 0; y < h; ++y)
147 glReadPixels(0,h-y-1,w, 1, GL_RGBA, GL_UNSIGNED_BYTE, &pixels[y*w*4]);
150 #if SDL_BYTEORDER == SDL_LIL_ENDIAN
151 SDL_Surface * surf = SDL_CreateRGBSurfaceFrom(pixels, w, h, 8*4, w*4, 0x000000ff,0x0000ff00,0x00ff0000,0xff000000);
153 SDL_Surface * surf = SDL_CreateRGBSurfaceFrom(pixels, w, h, 8*4, w*4, 0xff000000,0x00ff0000,0x0000ff00,0x000000ff);
156 Fatal("Failed to create SDL_Surface from pixel data - %s", SDL_GetError());
158 GLenum texture_format = (surf->format->Rmask == 0x000000FF) ? GL_RGBA : GL_BGRA;
159 Debug("SDL_Surface %d BytesPerPixel, format %d (RGB = %d, BGR = %d, RGBA = %d, BGRA = %d)", surf->format->BytesPerPixel, texture_format, GL_RGB, GL_BGR, GL_RGBA, GL_BGRA);
161 if (SDL_SaveBMP(surf, filename) != 0)
162 Fatal("SDL_SaveBMP failed - %s", SDL_GetError());
164 SDL_FreeSurface(surf);
171 * NOT PART OF THE DOCUMENT FORMAT
173 void Screen::RenderBMP(const char * filename) const
175 if (access(filename, R_OK) == -1)
177 Error("No such file \"%s\" - Nothing to render - You might have done this deliberately?", filename);
180 SDL_Surface * bmp = SDL_LoadBMP(filename);
182 Fatal("Failed to load BMP from %s - %s", filename, SDL_GetError());
187 GLenum texture_format;
188 switch (bmp->format->BytesPerPixel)
190 case 4: //contains alpha
191 texture_format = (bmp->format->Rmask == 0x000000FF) ? GL_RGBA : GL_BGRA;
193 case 3: //does not contain alpha
194 texture_format = (bmp->format->Rmask == 0x000000FF) ? GL_RGB : GL_BGR;
197 Fatal("Could not understand SDL_Surface format (%d colours)", bmp->format->BytesPerPixel);
201 //Debug("SDL_Surface %d BytesPerPixel, format %d (RGB = %d, BGR = %d, RGBA = %d, BGRA = %d)", bmp->format->BytesPerPixel, texture_format, GL_RGB, GL_BGR, GL_RGBA, GL_BGRA);
205 glEnable(GL_TEXTURE_2D);
206 glGenTextures(1, &texID);
207 glBindTexture(GL_TEXTURE_2D, texID);
209 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
210 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
211 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
212 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
214 glTexImage2D(GL_TEXTURE_2D, 0, bmp->format->BytesPerPixel, w, h, 0, texture_format, GL_UNSIGNED_BYTE, bmp->pixels);
216 glMatrixMode(GL_PROJECTION);
218 glOrtho(0.0, 1.0, 1.0, 0.0, -1.f, 1.f);
219 glMatrixMode(GL_MODELVIEW);
223 glTexCoord2i(0,0); glVertex2f(0,0);
224 glTexCoord2i(1,0); glVertex2f(1,0);
225 glTexCoord2i(1,1); glVertex2f(1,1);
226 glTexCoord2i(0,1); glVertex2f(0,1);
229 glDisable(GL_TEXTURE_2D);
230 SDL_FreeSurface(bmp);