Implement basic first person view rendering.

camera.cpp

@@ -1,4 +1,5 @@
 #include "camera.h"
+#include <stdio.h>
 
 #include "maths.h"
 #include "level.h"
@@ -54,22 +55,12 @@ void camera_destroy(Camera *camera)
 
 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;
-
+	float rayDirection = camera->direction - camera->fov/2.f + 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;
+		rayDirection += rayDirectionStep;
 	}
 }

firstperson.cpp

@@ -20,16 +20,32 @@ int firstperson_init(unsigned int _width, unsigned int _height)
 	return 1;
 }
 
-void firstperson_update(sf::RenderTarget* renderTarget)
+void firstperson_update(sf::RenderTarget* renderTarget, Camera* camera)
 {
+	const float columnWidth = (float)width/(float)camera->resolution;
+	float columnHeight = 0;
 	renderTexture.clear();
-	sf::CircleShape shape(50);
-	renderTexture.draw(shape);
-	renderTexture.display();
 
+	for (unsigned int i = 0; i < camera->resolution; i++) {
+		float distance = camera->rays[i].distance;
+		if (distance > 0.f) columnHeight = 0.5f * (float)height/camera->rays[i].distance;
+
+		float centeredHeight = (float)height/2.f - columnHeight/2.f;
+		float distanceScale = distance/10.f;
+		distanceScale = (distanceScale > 1.f)? 1.f : distanceScale;
+		float brightness = 255.f*(1.f-distanceScale);
+
+		sf::RectangleShape rectangle(sf::Vector2f(columnWidth, columnHeight));
+		rectangle.setPosition(sf::Vector2f(i*columnWidth, centeredHeight));
+		rectangle.setFillColor(sf::Color(brightness, brightness, brightness));
+		renderTexture.draw(rectangle);
+	}
+
+	renderTexture.display();
 	sf::Sprite sprite(renderTexture.getTexture());
 	sprite.setPosition(renderTexturePosition);
 	renderTarget->draw(sprite);
+
 }
 
 void firstperson_setTexturePosition(float x, float y)

firstperson.h

@@ -2,9 +2,10 @@
 #define FIRSTPERSON_H
 
 #include <SFML/Graphics.hpp>
+#include "camera.h"
 
 int firstperson_init(unsigned int width, unsigned int height);
-void firstperson_update(sf::RenderTarget* renderTarget);
+void firstperson_update(sf::RenderTarget* renderTarget, Camera* camera);
 void firstperson_setTexturePosition(float x, float y);
 
 #endif

level.cpp

@@ -2,18 +2,23 @@
 
 #include "maths.h"
 
-#define WIDTH  5
-#define HEIGHT 5
+#define WIDTH  10
+#define HEIGHT 10
 
 static float castRay(sf::Vector2f point, float direction);
 static void getGridIndex(sf::Vector2f point, int* x, int* y);
 
 static unsigned int level[WIDTH * HEIGHT] = {
-	0, 0, 1, 1, 1,
-	0, 0, 0, 0, 0,
-	1, 0, 1, 0, 1,
-	1, 0, 0, 0, 1,
-	1, 0, 1, 1, 1,
+	1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
+	1, 1, 1, 0, 0, 0, 0, 0, 1, 1,
+	1, 1, 1, 0, 0, 0, 0, 1, 0, 1,
+	1, 0, 0, 1, 0, 0, 0, 0, 0, 1,
+	1, 0, 0, 1, 0, 0, 0, 1, 0, 1,
+	1, 0, 0, 1, 0, 0, 0, 0, 0, 1,
+	1, 0, 0, 1, 0, 0, 0, 1, 0, 1,
+	1, 0, 0, 0, 0, 0, 0, 0, 0, 1,
+	1, 0, 0, 1, 0, 0, 0, 1, 1, 1,
+	1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
 };
 
 int level_init()

view.cpp

@@ -7,7 +7,7 @@
 #include "minimap.h"
 #include "firstperson.h"
 
-#define MINIMAP_SIZE 460
+#define MINIMAP_SIZE 720
 #define VIEW_SIZE MINIMAP_SIZE*2
 
 static int handleKeyCode(sf::Keyboard::Key key);
@@ -21,7 +21,7 @@ static sf::Clock timer;
 int view_init()
 {
 	printf("view_init()\n");
-	if (!camera_init(&camera, sf::Vector2f(5.f/2.f, 5.f/2.f), 0.f, 100, 0.5f*PI)) return 0;
+	if (!camera_init(&camera, sf::Vector2f(10.f/2.f, 10.f/2.f), 0.f, 128, 0.5f*PI)) return 0;
 	if (!minimap_init(MINIMAP_SIZE)) return 0;
 	if (!firstperson_init(VIEW_SIZE, MINIMAP_SIZE)) return 0;
 
@@ -53,7 +53,7 @@ int view_update()
 
 	window.clear();
 	minimap_update(&window, &camera);
-	firstperson_update(&window);
+	firstperson_update(&window, &camera);
 	window.display();
 
 	return 1;