Added stuff

loki_sample/alpha-example/alpha-sdl.c

@@ -0,0 +1,95 @@
+/* Example of alpha blending with SDL. */
+
+#include <SDL/SDL.h>
+#include <SDL/SDL_image.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+int main()
+{
+	SDL_Surface *screen;
+	SDL_Surface *background;
+	SDL_Surface *image_with_alpha;
+	SDL_Surface *image_without_alpha;
+	SDL_Rect src, dest;
+
+	/* init sdl and check for erro */
+	if (SDL_Init(SDL_INIT_VIDEO) != 0) {
+		printf("Unable to init SDL: %s\n", SDL_GetError());
+		return 1;
+	}
+
+	atexit(SDL_Quit);
+
+	screen = SDL_SetVideoMode(800, 600, 16, 0);
+	if (screen == NULL) {
+		printf("Unable to set video mode: %s\n", SDL_GetError());
+		return 1;
+	}
+
+	/* Load image file */
+	image_with_alpha = IMG_Load("with-alpha.png");
+	if (image_with_alpha == NULL) {
+			printf("Unable to load image. \n");
+			return 1;
+	}
+	
+	image_without_alpha = IMG_Load("without-alpha.png");
+	if (image_without_alpha == NULL) {
+		printf("Unable to load image\n");
+			return 1;
+	}
+
+	background = IMG_Load("background.png");
+	if (background == NULL) {
+		printf("Unable to load background.png.\n");
+		return 1;
+	}
+
+	/* Draw background. */
+
+	src.x = 0;
+	src.y = 0;
+	src.w = background->w;
+	src.h = background->h;
+	dest.x = 0;
+	dest.y = 0;
+	dest.w = background->w;
+	dest.h = background->h;
+	SDL_BlitSurface(background, &src, screen, &dest);
+
+	/* draw first image with alpha */
+
+	SDL_SetAlpha(image_with_alpha, SDL_SRCALPHA, 0);
+	src.w = image_with_alpha->w;
+	src.h = image_with_alpha->h;
+	dest.w = src.w;
+	dest.h = src.h;
+	dest.x = 40;
+	dest.y = 50;
+	SDL_BlitSurface(image_with_alpha, &src, screen, &dest);
+
+	/* Draw second image without alpha. Set to 50% transparence for entire surface.
+	 */
+	SDL_SetAlpha(image_without_alpha, SDL_SRCALPHA, 128);
+	src.w = image_without_alpha->w;
+	src.h = image_without_alpha->h;
+	dest.w = src.w;
+	dest.h = src.h;
+	dest.x = 180;
+	dest.y = 50;
+	SDL_BlitSurface(image_without_alpha, &src, screen, &dest);
+
+	/* Ask SDL to update entire screen */
+	SDL_UpdateRect(screen, 0, 0, 0, 0);
+
+	SDL_Delay(10000);
+
+	/* Free memory */
+	SDL_FreeSurface(background);
+	SDL_FreeSurface(image_with_alpha);
+	SDL_FreeSurface(image_without_alpha);
+
+	return 0;
+}
+

loki_sample/simple_blit_example/blitting-surface-sdl.c

@@ -0,0 +1,62 @@
+/* Example of simple blitting with SD>. */
+
+#include <SDL/SDL.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+int main()
+{
+	SDL_Surface *screen;
+	SDL_Surface *image;
+	SDL_Rect src, dest;
+
+	/* init and check for errors*/
+	if (SDL_Init(SDL_INIT_VIDEO) != 0) {
+		printf("Unable to init SDL: %s\n", SDL_GetError());
+		return 1;
+	}
+
+	atexit(SDL_Quit);
+
+	/* 256x256 hicolor (16-bit) */
+
+	screen = SDL_SetVideoMode(512, 512, 32, 0); // finding BMPs is hard // Doesn't work anyway... 
+																							//I seem to remem ber having htis problem before
+	if (screen == NULL) {
+		printf("Setting video mode failed: %s\n", SDL_GetError());
+		return 1;
+	}
+
+	/* Load bitmap file. SDL_LoadBMP returns a pointer to a new surface containing 
+	 * the loaded image. */
+	image = SDL_LoadBMP("test-image.bmp");
+	if (image == NULL) {
+		printf("Unable to load bitmap.\n");
+		return 1;
+	}
+
+	/* The SDL blitting function needs to know how much data
+	 * to copy. We provide this with SDL_Rect structures, which
+	 * define the source and destination rectangles. The areas
+	 * shoul be the same; SDL does not currently handle image
+	 * stretching. */
+
+	src.x = 0;
+	src.y = 0;
+	src.w = image->w; /* copy entire image */
+	src.h = image->h;
+
+	/* Draw the bitmap to the screen. It is not necessary to lock surfaces
+	 * before blitting; SDL will handle that. */
+
+	SDL_BlitSurface(image, &src, screen, &dest);
+
+	SDL_Delay(3000);
+
+	/* Free memory allocated to the bitmap. */
+	SDL_FreeSurface(image);
+
+	return 0;
+}
+
+