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Quick and dirty idea for a poor-man's lighting effect.

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Zed A. Shaw 2025-01-14 20:07:37 -05:00
parent d6a2f83f10
commit 6533f950d2
1 changed files with 30 additions and 12 deletions
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42
sfmlcaster.cpp
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@ -85,8 +85,25 @@ double spriteDistance[numSprites];
std::vector<uint32_t> texture[numTextures]; std::vector<uint32_t> texture[numTextures];
union RGBA {
struct {
uint8_t r;
uint8_t g;
uint8_t b;
uint8_t a;
} color;
uint32_t out;
};
inline void RGBA_brightness(RGBA& pixel, double distance) {
pixel.color.r /= distance;
pixel.color.g /= distance;
pixel.color.b /= distance;
}
#define pixcoord(X, Y) ((Y) * RAY_VIEW_WIDTH) + (X) #define pixcoord(X, Y) ((Y) * RAY_VIEW_WIDTH) + (X)
uint32_t pixels[RAY_VIEW_WIDTH * RAY_VIEW_HEIGHT] = {0}; RGBA pixels[RAY_VIEW_WIDTH * RAY_VIEW_HEIGHT] = {{.out=0}};
sf::Texture view_texture; sf::Texture view_texture;
sf::Sprite view_sprite; sf::Sprite view_sprite;
@ -166,18 +183,19 @@ void draw_line(sf::RenderWindow &window, Point start, Point end, uint32_t color)
y = y + sy; y = y + sy;
} }
pixels[pixcoord(x,y)] = color; pixels[pixcoord(x,y)].out = color;
} }
} }
void clear(sf::RenderWindow &window) { void clear(sf::RenderWindow &window) {
std::fill_n(pixels, RAY_VIEW_WIDTH * RAY_VIEW_HEIGHT, 0); // std::fill_n((uint32_t *)pixels, RAY_VIEW_WIDTH * RAY_VIEW_HEIGHT, 0);
window.clear(); // window.clear();
} }
void ray_casting(sf::RenderWindow &window, Matrix& map) { void ray_casting(sf::RenderWindow &window, Matrix& map) {
int w = RAY_VIEW_WIDTH; int w = RAY_VIEW_WIDTH;
int h = RAY_VIEW_HEIGHT; int h = RAY_VIEW_HEIGHT;
double perpWallDist;
// WALL CASTING // WALL CASTING
for(int x = 0; x < w; x++) { for(int x = 0; x < w; x++) {
@ -197,7 +215,6 @@ void ray_casting(sf::RenderWindow &window, Matrix& map) {
// length of ray from one x or y-side to next x or y-side // length of ray from one x or y-side to next x or y-side
double deltaDistX = std::abs(1.0 / rayDirX); double deltaDistX = std::abs(1.0 / rayDirX);
double deltaDistY = std::abs(1.0 / rayDirY); double deltaDistY = std::abs(1.0 / rayDirY);
double perpWallDist;
int stepX = 0; int stepX = 0;
int stepY = 0; int stepY = 0;
@ -276,14 +293,13 @@ void ray_casting(sf::RenderWindow &window, Matrix& map) {
for(int y = drawStart; y < drawEnd; y++) { for(int y = drawStart; y < drawEnd; y++) {
int texY = (int)texPos & (texHeight - 1); int texY = (int)texPos & (texHeight - 1);
texPos += step; texPos += step;
uint32_t color = texture[texNum][texHeight * texY + texX]; RGBA pixel{.out=texture[texNum][texHeight * texY + texX]};
RGBA_brightness(pixel, perpWallDist);
pixels[pixcoord(x, y)] = color; pixels[pixcoord(x, y)] = pixel;
} }
// SET THE ZBUFFER FOR THE SPRITE CASTING // SET THE ZBUFFER FOR THE SPRITE CASTING
ZBuffer[x] = perpWallDist; ZBuffer[x] = perpWallDist;
} }
// SPRITE CASTING // SPRITE CASTING
@ -357,7 +373,9 @@ void ray_casting(sf::RenderWindow &window, Matrix& map) {
uint32_t color = sprite_texture[texWidth * texY + texX]; uint32_t color = sprite_texture[texWidth * texY + texX];
// poor person's transparency, get current color from the texture // poor person's transparency, get current color from the texture
if((color & 0x00FFFFFF) != 0) { if((color & 0x00FFFFFF) != 0) {
pixels[pixcoord(stripe, y)] = color; RGBA pixel{.out=color};
RGBA_brightness(pixel, perpWallDist);
pixels[pixcoord(stripe, y)] = pixel;
} }
} }
} }
@ -421,11 +439,11 @@ void draw_ceiling_floor(sf::RenderWindow &window) {
// FLOOR // FLOOR
color = texture[floorTexture][texWidth * ty + tx]; color = texture[floorTexture][texWidth * ty + tx];
pixels[pixcoord(x, y)] = color; pixels[pixcoord(x, y)].out = color;
// CEILING // CEILING
color = texture[ceilingTexture][texWidth * ty + tx]; color = texture[ceilingTexture][texWidth * ty + tx];
pixels[pixcoord(x, screenHeight - y - 1)] = color; pixels[pixcoord(x, screenHeight - y - 1)].out = color;
} }
} }
} }