1 files changed, 112 insertions, 0 deletions
diff --git a/nebu/video/video_system.c b/nebu/video/video_system.c
new file mode 100644
index 0000000..fdfcc56
--- /dev/null
+++ b/nebu/video/video_system.c
@@ -0,0 +1,112 @@
+#include "Nebu_video.h"
+
+#include "SDL.h"
+#include "SDL_opengl.h"
+
+static SDL_Surface *screen;
+static int width, height;
+static int flags;
+static int fullscreen;
+extern int video_initialized;
+
+void SystemSwapBuffers() {
+  SDL_GL_SwapBuffers();
+}
+
+void SystemInitWindow(int x, int y, int w, int h) {
+  width = w;
+  height = h;
+}
+
+void SystemInitDisplayMode(int f, unsigned char full) {
+  int bitdepth, zdepth;
+
+  flags = f;
+  fullscreen = full;
+  if(!video_initialized) {
+    if(SDL_InitSubSystem(SDL_INIT_VIDEO) < 0) {
+      fprintf(stderr, "[system] can't initialize Video: %s\n", SDL_GetError());
+      exit(1); /* OK: critical, no visual */
+    }
+  }
+  if(flags & SYSTEM_DOUBLE)
+    SDL_GL_SetAttribute( SDL_GL_DOUBLEBUFFER, 1);
+
+  if(flags & SYSTEM_32_BIT) {
+    zdepth = 24;
+    bitdepth = 32;
+  } else {
+    zdepth = 16;
+    bitdepth = 16;
+  }
+  if(flags & SYSTEM_DEPTH)
+    SDL_GL_SetAttribute( SDL_GL_DEPTH_SIZE, zdepth);
+  if(flags & SYSTEM_STENCIL)
+     SDL_GL_SetAttribute( SDL_GL_STENCIL_SIZE, 8);
+  else 
+     SDL_GL_SetAttribute( SDL_GL_STENCIL_SIZE, 0);
+  video_initialized = 1;
+  /* FIXME: bitdepth value unused */
+}
+
+void SystemSetGamma(float red, float green, float blue) {
+  SDL_SetGamma(red, green, blue);
+}
+
+int SystemCreateWindow(char *name) {
+  int f = SDL_OPENGL;
+  if(fullscreen & SYSTEM_FULLSCREEN)
+    f |= SDL_FULLSCREEN;
+  if( (screen = SDL_SetVideoMode( width, height, 0, f )) == NULL ) {
+    fprintf(stderr, "[system] Couldn't set GL mode: %s\n", SDL_GetError());
+    exit(1); /* OK: critical, no visual */
+  }
+  SDL_WM_SetCaption("GLtron", "");
+  glClearColor(0,0,0,0);
+  glClear(GL_COLOR_BUFFER_BIT);
+  SDL_GL_SwapBuffers();
+  return 1;
+}
+
+void SystemDestroyWindow(int id) {
+  /* quit the video subsytem
+	 * otherwise SDL can't create a new context on win32, if the stencil
+	 * bits change 
+	 */
+	/* there used to be some problems (memory leaks, unprober driver unloading)
+	 * caused by this, but I can't remember what they where
+	 */
+		 
+  SDL_QuitSubSystem(SDL_INIT_VIDEO);
+  video_initialized = 0;
+}
+
+void SystemReshapeFunc(void(*reshape)(int, int)) {
+}
+
+int SystemWriteBMP(char *filename, int x, int y, unsigned char *pixels) {
+  /* this code is shamelessly stolen from Ray Kelm, but I believe he
+     put it in the public domain */
+  SDL_Surface *temp;
+  int i;
+
+  temp = SDL_CreateRGBSurface(SDL_SWSURFACE, x, y, 24,
+#if SDL_BYTEORDER == SDL_LIL_ENDIAN
+			      0x000000FF, 0x0000FF00, 0x00FF0000, 0
+#else
+			      0x00FF0000, 0x0000FF00, 0x000000FF, 0
+#endif
+			      );
+
+  if (temp == NULL)
+    return -1;
+
+  for (i = 0; i < y; i++)
+    memcpy(((char *) temp->pixels) + temp->pitch * i, 
+	   pixels + 3 * x * (y - i - 1), x * 3);
+
+  SDL_SaveBMP(temp, filename);
+  SDL_FreeSurface(temp);
+  return 0;
+}
+