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Get rid of magic constants in rendertarget demo

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This commit is contained in:
Dmitry Marakasov 2013-12-18 06:21:53 +04:00
parent cb8153ab83
commit 1ef083b40d
1 changed files with 17 additions and 10 deletions
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27
demo/rendertarget.cc
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@ -35,9 +35,16 @@ unsigned char pixels[4 * 4 * 4] = {
RGBA(0x80, 0x00, 0xff, 0xff), RGBA(0x00, 0x00, 0xff, 0xff), RGBA(0x00, 0x80, 0xff, 0xff), RGBA(0x00, 0xff, 0xff, 0xff), RGBA(0x80, 0x00, 0xff, 0xff), RGBA(0x00, 0x00, 0xff, 0xff), RGBA(0x00, 0x80, 0xff, 0xff), RGBA(0x00, 0xff, 0xff, 0xff),
}; };
enum {
MY_SPRITE_SIZE = 4,
MY_SCREEN_WIDTH = 640,
MY_SCREEN_HEIGHT = 480,
MY_RENDERTARGET_SIZE = 512,
};
int Run() { int Run() {
SDL sdl(SDL_INIT_VIDEO); SDL sdl(SDL_INIT_VIDEO);
Window window("libSDL2pp demo: sprites", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, 640, 480, SDL_WINDOW_RESIZABLE); Window window("libSDL2pp demo: sprites", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, MY_SCREEN_WIDTH, MY_SCREEN_HEIGHT, SDL_WINDOW_RESIZABLE);
Renderer render(window, -1, SDL_RENDERER_ACCELERATED | SDL_RENDERER_TARGETTEXTURE); Renderer render(window, -1, SDL_RENDERER_ACCELERATED | SDL_RENDERER_TARGETTEXTURE);
render.SetDrawBlendMode(SDL_BLENDMODE_BLEND); render.SetDrawBlendMode(SDL_BLENDMODE_BLEND);
@ -51,16 +58,16 @@ int Run() {
} }
// Sprite data // Sprite data
Texture sprite(render, SDL_PIXELFORMAT_ARGB8888, SDL_TEXTUREACCESS_STATIC, 4, 4); Texture sprite(render, SDL_PIXELFORMAT_ARGB8888, SDL_TEXTUREACCESS_STATIC, MY_SPRITE_SIZE, MY_SPRITE_SIZE);
sprite.Update(Rect::Null(), pixels, 4 * 4); sprite.Update(Rect::Null(), pixels, MY_SPRITE_SIZE * MY_SPRITE_SIZE);
sprite.SetBlendMode(SDL_BLENDMODE_BLEND); sprite.SetBlendMode(SDL_BLENDMODE_BLEND);
// Two render target textures // Two render target textures
Texture target1(render, SDL_PIXELFORMAT_ARGB8888, SDL_TEXTUREACCESS_TARGET, 512, 512); Texture target1(render, SDL_PIXELFORMAT_ARGB8888, SDL_TEXTUREACCESS_TARGET, MY_RENDERTARGET_SIZE, MY_RENDERTARGET_SIZE);
target1.SetBlendMode(SDL_BLENDMODE_BLEND); target1.SetBlendMode(SDL_BLENDMODE_BLEND);
Texture target2(render, SDL_PIXELFORMAT_ARGB8888, SDL_TEXTUREACCESS_TARGET, 512, 512); Texture target2(render, SDL_PIXELFORMAT_ARGB8888, SDL_TEXTUREACCESS_TARGET, MY_RENDERTARGET_SIZE, MY_RENDERTARGET_SIZE);
target2.SetBlendMode(SDL_BLENDMODE_BLEND); target2.SetBlendMode(SDL_BLENDMODE_BLEND);
while (1) { while (1) {
@ -82,10 +89,10 @@ int Run() {
for (int i = 0; i < 4; i++) { for (int i = 0; i < 4; i++) {
render.SetTarget(target2); render.SetTarget(target2);
render.Clear(); render.Clear();
render.Copy(target1, Rect::Null(), Rect(0, 0, 256, 256), SDL_GetTicks() / 10000.0 * 360.0); render.Copy(target1, Rect::Null(), Rect(0, 0, MY_RENDERTARGET_SIZE / 2, MY_RENDERTARGET_SIZE / 2), SDL_GetTicks() / 10000.0 * 360.0);
render.Copy(target1, Rect::Null(), Rect(256, 0, 256, 256), SDL_GetTicks() / 10000.0 * 360.0); render.Copy(target1, Rect::Null(), Rect(MY_RENDERTARGET_SIZE / 2, 0, MY_RENDERTARGET_SIZE / 2, MY_RENDERTARGET_SIZE / 2), SDL_GetTicks() / 10000.0 * 360.0);
render.Copy(target1, Rect::Null(), Rect(0, 256, 256, 256), SDL_GetTicks() / 10000.0 * 360.0); render.Copy(target1, Rect::Null(), Rect(0, MY_RENDERTARGET_SIZE / 2, MY_RENDERTARGET_SIZE / 2, MY_RENDERTARGET_SIZE / 2), SDL_GetTicks() / 10000.0 * 360.0);
render.Copy(target1, Rect::Null(), Rect(256, 256, 256, 256), SDL_GetTicks() / 10000.0 * 360.0); render.Copy(target1, Rect::Null(), Rect(MY_RENDERTARGET_SIZE / 2, MY_RENDERTARGET_SIZE / 2, MY_RENDERTARGET_SIZE / 2, MY_RENDERTARGET_SIZE / 2), SDL_GetTicks() / 10000.0 * 360.0);
// Swap textures to copy recursively // Swap textures to copy recursively
target1.Swap(target2); target1.Swap(target2);
@ -95,7 +102,7 @@ int Run() {
render.SetTarget(); render.SetTarget();
render.Clear(); render.Clear();
render.Copy(target1, Rect::Null(), Rect(80, 0, 480, 480), SDL_GetTicks() / 10000.0 * 360.0); render.Copy(target1, Rect::Null(), Rect((MY_SCREEN_WIDTH - MY_SCREEN_HEIGHT) / 2, 0, MY_SCREEN_HEIGHT, MY_SCREEN_HEIGHT), SDL_GetTicks() / 10000.0 * 360.0);
render.Present(); render.Present();