sheldonmlee/raycasting
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Refactor storing of ray-casted distances.

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The ray-casting is done when camera_update() is called, and distances
are stored in the Camera struct.
This commit is contained in:
Sheldon Lee 2023-04-20 00:28:17 +01:00
parent 33f673741b
commit 2c06859473
7 changed files with 145 additions and 100 deletions
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41
camera.cpp
View File

@ -7,12 +7,24 @@
#define TRANSLATIONAL_SPEED 1.f
static void move(Camera* camera, float t);
static void castRays(Camera* camera);
int camera_init(Camera* camera, sf::Vector2f pos, float direction, unsigned int resolution, float fov)
{
camera->pos = pos;
camera->direction = direction;
camera->resolution = resolution;
camera->fov = fov;
camera->rays = (CameraRay*)malloc(sizeof(CameraRay)*resolution);
return 1;
}
void camera_update(Camera* camera, float t)
{
if (!camera) return;
move(camera, t);
castRays(camera);
}
static void move(Camera* camera, float t)
@ -34,3 +46,30 @@ static void move(Camera* camera, float t)
camera->pos += offset;
camera->direction += rotation * t * ROTATION_SPEED;
}
void camera_destroy(Camera *camera)
{
free(camera->rays);
}
static void castRays(Camera* camera)
{
float rayDirection = 0;
float rayDirectionStep = camera->fov / (float)camera->resolution;
bool isOddResolution = (camera->resolution % 2);
float rayDirectionOffset = isOddResolution? 0 : rayDirectionStep / 2.f;
for (unsigned int i = 0; i < camera->resolution; i++) {
if (isOddResolution && i == 0)
rayDirection = camera->direction;
else if (i % 2)
rayDirection = camera->direction - rayDirectionOffset;
else
rayDirection = camera->direction + rayDirectionOffset;
camera->rays[i].direction = rayDirection;
camera->rays[i].distance = level_rayCastDistance(camera->pos, rayDirection);
if ((i + isOddResolution) % 2) rayDirectionOffset += rayDirectionStep;
}
}

10
camera.h
View File

@ -3,14 +3,24 @@
#include <SFML/Graphics.hpp>
typedef struct
{
float direction;
float distance;
} CameraRay;
typedef struct
{
sf::Vector2f pos;
float direction;
unsigned int resolution;
float fov;
CameraRay* rays;
} Camera;
int camera_init(Camera* camera, sf::Vector2f pos, float direction, unsigned int resolution, float fov);
void camera_update(Camera* camera, float t);
void camera_destroy(Camera* camera);
#endif

63
level.cpp
View File

@ -1,15 +1,10 @@
#include "level.h"
#include <stdio.h>
#include "maths.h"
#define WIDTH 5
#define HEIGHT 5
static void drawGrid(sf::RenderTarget* renderTarget, unsigned int tileSize);
static void drawGridLine(sf::RenderTarget* renderTarget, float step, bool isHorizontal);
static sf::Vertex getGridLineVertex(float n, float maxDimension, bool isStart, bool isHorizontal);
static float castRay(sf::Vector2f point, float direction);
static void getGridIndex(sf::Vector2f point, int* x, int* y);
@ -23,20 +18,16 @@ static unsigned int level[WIDTH * HEIGHT] = {
int level_init()
{
printf("level_init()\n");
return 1;
}
void level_update(sf::RenderTarget* renderTarget, unsigned int drawSize)
{
if (!renderTarget) return;
drawGrid(renderTarget, drawSize/WIDTH);
}
void level_end()
{
printf("level_end()\n");
return;
}
@ -51,58 +42,12 @@ void level_getDimensions(unsigned int* width, unsigned int* height)
*height = HEIGHT;
}
static void drawGrid(sf::RenderTarget* renderTarget, unsigned int tileSize)
unsigned int level_getGridValue(unsigned int x, unsigned int y)
{
for (unsigned int x = 0; x < WIDTH; x++) {
for (unsigned int y = 0; y < HEIGHT; y++) {
if (!level[y * HEIGHT + x]) continue;
if (x < 0 || WIDTH <= x) return 0;
if (y < 0 || HEIGHT <= y) return 0;
sf::RectangleShape rectangle(sf::Vector2f(tileSize, tileSize));
rectangle.setPosition((float)x * tileSize, (float)y * tileSize);
renderTarget->draw(rectangle);
}
}
drawGridLine(renderTarget, tileSize, true);
drawGridLine(renderTarget, tileSize, false);
}
static void drawGridLine(sf::RenderTarget* renderTarget, float step, bool isHorizontal)
{
unsigned int lines = isHorizontal? WIDTH : HEIGHT;
for (unsigned int n = 0; n < lines; n++) {
if (n == 0) continue;
float offset = (float)n * step;
float maxDimension = (float)lines * step;
sf::Vertex line[] =
{
getGridLineVertex(offset, maxDimension, true, isHorizontal),
getGridLineVertex(offset, maxDimension, false, isHorizontal)
};
renderTarget->draw(line, 2, sf::Lines);
}
}
static sf::Vertex getGridLineVertex(float offset, float maxDimension, bool isStart, bool isHorizontal)
{
sf::Vertex start;
sf::Vertex end;
if (isHorizontal) {
start = sf::Vertex(sf::Vector2f(offset, 0));
end = sf::Vertex(sf::Vector2f(offset, maxDimension));
}
else {
start = sf::Vertex(sf::Vector2f(0, offset));
end = sf::Vertex(sf::Vector2f(maxDimension, offset));
}
sf::Color color(100, 100, 100);
start.color = color;
end.color = color;
return isStart? start : end;
return level[y * HEIGHT + x];
}
static float castRay(sf::Vector2f point, float direction)

2
level.h
View File

@ -4,9 +4,9 @@
#include <SFML/Graphics.hpp>
int level_init();
void level_update(sf::RenderTarget* renderTarget, unsigned int drawSize);
void level_end();
float level_rayCastDistance(sf::Vector2f point, float direction);
void level_getDimensions(unsigned int* width, unsigned int* height);
unsigned int level_getGridValue(unsigned int x, unsigned int y);
#endif

108
minimap.cpp
View File

@ -3,28 +3,31 @@
#include "maths.h"
#include "level.h"
// Camera drawing
static void drawCamera(sf::RenderTarget* renderTarget, Camera* camera);
static void drawRays(sf::RenderTarget* renderTarget, Camera* camera);
static void drawLine(sf::RenderTarget* renderTarget, sf::Vector2f pos, float angle, float length, sf::Color color);
// Grid drawing
static void drawGrid(sf::RenderTarget* renderTarget, unsigned int tileSize);
static void drawGridLine(sf::RenderTarget* renderTarget, float step, bool isHorizontal);
static sf::Vertex getGridLineVertex(float n, float maxDimension, bool isStart, bool isHorizontal);
static sf::RenderTexture minimap;
static sf::RenderTexture renderTexture;
static sf::Vector2f renderTexturePosition;
static bool init = false;
static unsigned int minimapSize;
static unsigned int gridWidth, gridHeight;
static float drawScale;
int minimap_init(unsigned int size)
{
printf("minimap_init()\n");
if (!minimap.create(size, size)) return 0;
level_init();
unsigned int width, height;
level_getDimensions(&width, &height);
if (!renderTexture.create(size, size)) return 0;
minimapSize = size;
drawScale = (float)size/(float)width;
level_getDimensions(&gridWidth, &gridHeight);
drawScale = (float)size/(float)gridWidth;
init = true;
return 1;
@ -34,15 +37,22 @@ void minimap_update(sf::RenderTarget* renderTarget, Camera* camera)
{
if (!init) return;
if (!renderTarget || !camera) return;
minimap.clear();
level_update(&minimap, minimapSize);
drawCamera(&minimap, camera);
minimap.display();
sf::Sprite sprite(minimap.getTexture());
renderTexture.clear();
drawGrid(&renderTexture, minimapSize/gridWidth);
drawCamera(&renderTexture, camera);
renderTexture.display();
sf::Sprite sprite(renderTexture.getTexture());
renderTarget->draw(sprite);
}
void minimap_setTexturePosition(float x, float y)
{
renderTexturePosition.x = x;
renderTexturePosition.y = y;
}
static void drawCamera(sf::RenderTarget* renderTarget, Camera* camera)
{
const sf::Vector2f scaledPos = camera->pos * drawScale;
@ -61,24 +71,9 @@ static void drawRays(sf::RenderTarget* renderTarget, Camera* camera)
{
const sf::Vector2f scaledPos = camera->pos * drawScale;
float rayDirection = 0;
float rayDirectionStep = camera->fov / (float)camera->resolution;
bool isOddResolution = (camera->resolution % 2);
float rayDirectionOffset = isOddResolution? 0 : rayDirectionStep / 2.f;
for (unsigned int i = 0; i < camera->resolution; i++) {
if (isOddResolution && i == 0)
rayDirection = camera->direction;
else if (i % 2)
rayDirection = camera->direction - rayDirectionOffset;
else
rayDirection = camera->direction + rayDirectionOffset;
float distance = level_rayCastDistance(camera->pos, rayDirection) * drawScale;
drawLine(renderTarget, scaledPos, rayDirection, distance, sf::Color(150, 150, 100));
if ((i + isOddResolution) % 2) rayDirectionOffset += rayDirectionStep;
CameraRay* ray = &camera->rays[i];
drawLine(renderTarget, scaledPos, ray->direction, ray->distance * drawScale, sf::Color(150, 150, 100));
}
}
@ -98,3 +93,56 @@ static void drawLine(sf::RenderTarget* renderTarget, sf::Vector2f pos, float ang
renderTarget->draw(line, 2, sf::Lines);
}
static void drawGrid(sf::RenderTarget* renderTarget, unsigned int tileSize)
{
for (unsigned int x = 0; x < gridWidth; x++) {
for (unsigned int y = 0; y < gridHeight; y++) {
if (!level_getGridValue(x, y)) continue;
sf::RectangleShape rectangle(sf::Vector2f(tileSize, tileSize));
rectangle.setPosition((float)x * tileSize, (float)y * tileSize);
renderTarget->draw(rectangle);
}
}
drawGridLine(renderTarget, tileSize, true);
drawGridLine(renderTarget, tileSize, false);
}
static void drawGridLine(sf::RenderTarget* renderTarget, float step, bool isHorizontal)
{
unsigned int lines = isHorizontal? gridWidth : gridHeight;
for (unsigned int n = 0; n < lines; n++) {
if (n == 0) continue;
float offset = (float)n * step;
float maxDimension = (float)lines * step;
sf::Vertex line[] =
{
getGridLineVertex(offset, maxDimension, true, isHorizontal),
getGridLineVertex(offset, maxDimension, false, isHorizontal)
};
renderTarget->draw(line, 2, sf::Lines);
}
}
static sf::Vertex getGridLineVertex(float offset, float maxDimension, bool isStart, bool isHorizontal)
{
sf::Vertex start;
sf::Vertex end;
if (isHorizontal) {
start = sf::Vertex(sf::Vector2f(offset, 0));
end = sf::Vertex(sf::Vector2f(offset, maxDimension));
}
else {
start = sf::Vertex(sf::Vector2f(0, offset));
end = sf::Vertex(sf::Vector2f(maxDimension, offset));
}
sf::Color color(100, 100, 100);
start.color = color;
end.color = color;
return isStart? start : end;
}

1
minimap.h
View File

@ -6,5 +6,6 @@
int minimap_init(unsigned int size);
void minimap_update(sf::RenderTarget* renderTarget, Camera* camera);
void minimap_setTexturePosition(float x, float y);
#endif

18
view.cpp
View File

@ -6,22 +6,24 @@
#include "camera.h"
#include "minimap.h"
#define MINIMAP_SIZE 250
#define HALF_MINIMAP_SIZE MINIMAP_SIZE/2.f
#define DRAW_SCALE MINIMAP_SIZE/5.f
#define MINIMAP_SIZE 460
#define VIEW_SIZE MINIMAP_SIZE*2
static int handleKeyCode(sf::Keyboard::Key key);
static Camera camera = { sf::Vector2f(5.f/2.f, 5.f/2.f), 0.f, 300, 0.5f*PI };
static Camera camera;
static sf::Uint32 style = sf::Style::Titlebar;
static sf::RenderWindow window(sf::VideoMode(MINIMAP_SIZE + camera.resolution, MINIMAP_SIZE), "Raycasting", style);
static sf::RenderWindow window(sf::VideoMode(MINIMAP_SIZE + VIEW_SIZE, MINIMAP_SIZE), "Raycasting", style);
static sf::Clock timer;
int view_init()
{
printf("view_init()\n");
minimap_init(MINIMAP_SIZE);
if (!camera_init(&camera, sf::Vector2f(5.f/2.f, 5.f/2.f), 0.f, 100, 0.5f*PI)) return 0;
if (!minimap_init(MINIMAP_SIZE)) return 0;
minimap_setTexturePosition(0.f, 0.f);
return 1;
}
@ -55,9 +57,9 @@ int view_update()
void view_end()
{
printf("view_end()\n");
camera_destroy(&camera);
window.close();
printf("view_end()\n");
}
static int handleKeyCode(sf::Keyboard::Key key)