Software raycasting now works, but has some major problems / is extremely

slow. Perhaps it will only be useful in debugging the kernel via emulation

include/RayCaster.h

@@ -40,6 +40,7 @@ protected:
 	Old_Map * map = nullptr;
 	Camera *camera = nullptr;
 	std::vector<Light> lights;
+	int light_count = 0;
 	sf::Uint8 *viewport_image = nullptr;
 	sf::Vector4f *viewport_matrix = nullptr;
 	sf::Vector2i viewport_resolution;

include/Software_Caster.h

@@ -1,4 +1,5 @@
 #include "RayCaster.h"
+#include <thread>
 
 class Software_Caster : public RayCaster
 {
@@ -26,6 +27,9 @@ public:
 
 private:
 	
-	void cast_rays();
-
+	void cast_viewport();
+	void cast_thread(int start_id, int end_id);
+	void cast_ray(int id);
+	void blit_pixel(sf::Color color, sf::Vector2i position, sf::Vector3i mask);
+	sf::Color global_light(sf::Color in, sf::Vector3i mask);
 };

include/util.hpp

@@ -10,14 +10,13 @@ const double PI = 3.141592653589793238463;
 const float  PI_F = 3.14159265358979f;
 
 struct Light {
+#pragma pack(1)
 	sf::Vector4f rgbi;
 
 	// I believe that Vector3's get padded to Vector4's. Give them a non-garbage value
 	sf::Vector3f position;
-	const float padding_1 = -1;
 
 	sf::Vector3f direction_cartesian;
-	const float padding_2 = -2;
 };
 
 struct fps_counter {

kernels/ray_caster_kernel.cl

@@ -191,7 +191,7 @@ __kernel void raycaster(
 			case 5:
 			
 				//write_imagef(image, pixel, (float4)(.00, .00,  + 0.5, 1.00));
-				write_imagef(image, pixel, white_light((float4)(.35, .00, ((1.0 - 0) / (128 - 0) * (voxel.z - 128)) + 1, 0.2), (float3)(lights[7], lights[8], lights[9]), mask));
+				write_imagef(image, pixel, white_light((float4)(.40, .00, ((1.0 - 0) / (128 - 0) * (voxel.z - 128)) + 1, 0.2), (float3)(lights[7], lights[8], lights[9]), mask));
 				return;
 
 				float3 vox = convert_float3(voxel);

src/Hardware_Caster.cpp

@@ -170,11 +170,13 @@ void Hardware_Caster::create_viewport(int width, int height, float v_fov, float
 
 void Hardware_Caster::assign_lights(std::vector<Light> lights) {
 	
+	std::cout << sizeof(Light);
+
 	this->lights = std::vector<Light>(lights);
 
-	int light_count = lights.size();
+	light_count = lights.size();
 
-	create_buffer("lights", sizeof(float) * 12 * light_count, lights.data(), CL_MEM_READ_ONLY | CL_MEM_USE_HOST_PTR);
+	create_buffer("lights", sizeof(float) * 10 * light_count, this->lights.data(), CL_MEM_READ_ONLY | CL_MEM_USE_HOST_PTR);
 
 	create_buffer("light_count", sizeof(int), &light_count);
 

src/Old_map.cpp

@@ -17,7 +17,7 @@ Old_Map::~Old_Map() {
 void Old_Map::generate_terrain() {
 	std::mt19937 gen;
 	std::uniform_real_distribution<double> dis(-1.0, 1.0);
-	auto f_rand = std::bind(dis, gen);
+	auto f_rand = std::bind(dis, std::ref(gen));
 
 	voxel_data = new char[dimensions.x * dimensions.y * dimensions.z];
 	height_map = new double[dimensions.x * dimensions.y];
@@ -34,7 +34,8 @@ void Old_Map::generate_terrain() {
 	//value 2^n+1
 	int DATA_SIZE = dimensions.x + 1;
 	//an initial seed value for the corners of the data
-	double SEED = rand() % 25 + 25;
+	//srand(f_rand());
+	double SEED = rand() % 25 + 55;
 
 	//seed the data
 	set_sample(0, 0, SEED);

src/Software_Caster.cpp

@@ -19,19 +19,19 @@ int Software_Caster::init()
 void Software_Caster::create_viewport(int width, int height, float v_fov, float h_fov)
 {
 	// CL needs the screen resolution
-	sf::Vector2i view_res(width, height);
+	viewport_resolution = sf::Vector2i(width, height);
 
 	// And an array of vectors describing the way the "lens" of our
 	// camera works
 	// This could be modified to make some odd looking camera lenses
 
-	double y_increment_radians = DegreesToRadians(v_fov / view_res.y);
-	double x_increment_radians = DegreesToRadians(h_fov / view_res.x);
+	double y_increment_radians = DegreesToRadians(v_fov / viewport_resolution.y);
+	double x_increment_radians = DegreesToRadians(h_fov / viewport_resolution.x);
 
 	viewport_matrix = new sf::Vector4f[width * height * 4];
 
-	for (int y = -view_res.y / 2; y < view_res.y / 2; y++) {
-		for (int x = -view_res.x / 2; x < view_res.x / 2; x++) {
+	for (int y = -viewport_resolution.y / 2; y < viewport_resolution.y / 2; y++) {
+		for (int x = -viewport_resolution.x / 2; x < viewport_resolution.x / 2; x++) {
 
 			// The base ray direction to slew from
 			sf::Vector3f ray(1, 0, 0);
@@ -51,7 +51,7 @@ void Software_Caster::create_viewport(int width, int height, float v_fov, float
 				static_cast<float>(ray.z)
 				);
 
-			int index = (x + view_res.x / 2) + view_res.x * (y + view_res.y / 2);
+			int index = (x + viewport_resolution.x / 2) + viewport_resolution.x * (y + viewport_resolution.y / 2);
 			ray = Normalize(ray);
 
 			viewport_matrix[index] = sf::Vector4f(
@@ -71,7 +71,7 @@ void Software_Caster::create_viewport(int width, int height, float v_fov, float
 		viewport_image[i] = 255;     // R
 		viewport_image[i + 1] = 255; // G
 		viewport_image[i + 2] = 255; // B
-		viewport_image[i + 3] = 100; // A
+		viewport_image[i + 3] = 255; // A
 	}
 
 	// Interop lets us keep a reference to it as a texture
@@ -109,7 +109,7 @@ void Software_Caster::validate() {
 }
 
 void Software_Caster::compute() {
-	cast_rays();
+	cast_viewport();
 }
 
 void Software_Caster::draw(sf::RenderWindow * window) {
@@ -117,14 +117,31 @@ void Software_Caster::draw(sf::RenderWindow * window) {
 	window->draw(viewport_sprite);
 }
 
-void Software_Caster::cast_rays()
-{
+void Software_Caster::cast_viewport() {
+
+	std::vector<std::thread*> threads;
+	for (int i = 0; i < 13; i++) {
+		int s = viewport_resolution.x * ((viewport_resolution.y / 13) * i);
+		int e = viewport_resolution.x * ((viewport_resolution.y / 13) * (i + 1));
+		threads.push_back(new std::thread(&Software_Caster::cast_thread, this, s, e));
+	}
+
+	for (auto i : threads) {
+		i->join();
+		delete i;
+	}
+}
 
-	int i = 0;
-	for (int y = 0; y < viewport_resolution.y; y++) {
-		for (int x = 0; x < viewport_resolution.x; x++) {
+void Software_Caster::cast_thread(int start_id, int end_id) {
 
-			int id = i;
+	for (int i = start_id; i < end_id; i++) {
+		cast_ray(i);
+	}
+
+}
+
+void Software_Caster::cast_ray(int id)
+{
 	sf::Vector2i pixel = { id % viewport_resolution.x, id / viewport_resolution.x };
 
 	// 4f 3f ??
@@ -251,11 +268,11 @@ void Software_Caster::cast_rays()
 			);
 
 		if (overshoot.x == 0 || overshoot.y == 0 || overshoot.z == 0 || undershoot.x == 0 || undershoot.y == 0) {
-					viewport_image[x + viewport_resolution.x * y] = (255, 0, 255, 255);
+			blit_pixel(sf::Color::Yellow, sf::Vector2i{ pixel.x,pixel.y }, mask);
 			return;
 		}
 		if (undershoot.z == 0) {
-					viewport_image[x + viewport_resolution.x * y] = (255, 0, 255, 255);
+			blit_pixel(sf::Color::Yellow, sf::Vector2i{ pixel.x,pixel.y }, mask);
 			return;
 		}
 
@@ -267,34 +284,57 @@ void Software_Caster::cast_rays()
 
 		if (voxel_data != 0) {
 			switch (voxel_data) {
-					case 255:
-						viewport_image[x + viewport_resolution.x * y] = (255, 0, 255, 255);
+			case 1:
+				blit_pixel(sf::Color::Green, sf::Vector2i{ pixel.x,pixel.y }, mask);
 				return;
 			case 2:
-						viewport_image[x + viewport_resolution.x * y] = (255, 0, 255, 255);
+				blit_pixel(sf::Color::Green, sf::Vector2i{ pixel.x,pixel.y }, mask);
 				return;
 			case 3:
-						viewport_image[x + viewport_resolution.x * y] = (255, 0, 255, 255);
+				blit_pixel(sf::Color::Green, sf::Vector2i{ pixel.x,pixel.y }, mask);
 				return;
 			case 4:
-						viewport_image[x + viewport_resolution.x * y] = (255, 0, 255, 255);
+				blit_pixel(sf::Color::Green, sf::Vector2i{ pixel.x,pixel.y }, mask);
 				return;
 			case 5:
-						viewport_image[x + viewport_resolution.x * y] = (0, 255, 255, 255);
+				blit_pixel(sf::Color(30, 10, 200, 100), sf::Vector2i{ pixel.x,pixel.y }, mask);
+				return;
 			case 6:
-						viewport_image[x + viewport_resolution.x * y] = (255, 0, 255, 255);
+				blit_pixel(sf::Color::Green, sf::Vector2i{ pixel.x,pixel.y }, mask);
 				return;
 			default:
 				//write_imagef(image, pixel, (float4)(.30, .2550, .2550, 255.00));
-						continue;
+				return;
 			}
 		}
 
 		dist++;
 	} while (dist < max_dist);
 
-			viewport_image[x + viewport_resolution.x * y] = (255, 0, 0, 255);
+	blit_pixel(sf::Color::Red, sf::Vector2i{ pixel.x,pixel.y }, mask);
 	return;
-		}
-	}
+}
+
+void Software_Caster::blit_pixel(sf::Color color, sf::Vector2i position, sf::Vector3i mask) {
+	
+	sf::Color t = global_light(color, mask);
+	viewport_image[(position.x + viewport_resolution.x * position.y) * 4 + 0] = t.r;
+	viewport_image[(position.x + viewport_resolution.x * position.y) * 4 + 1] = t.g;
+	viewport_image[(position.x + viewport_resolution.x * position.y) * 4 + 2] = t.b;
+	viewport_image[(position.x + viewport_resolution.x * position.y) * 4 + 3] = t.a;
+}
+
+sf::Color Software_Caster::global_light(sf::Color in, sf::Vector3i mask) {
+
+	sf::Vector3f mask_f(mask);
+
+	in.a = in.a + acos(
+				DotProduct(
+					Normalize(lights.at(0).direction_cartesian),
+					Normalize(mask_f)
+					)
+				)/ 2;
+
+	return in;
+
 }

src/main.cpp

@@ -31,6 +31,7 @@
 #include "Hardware_Caster.h"
 #include "Vector4.hpp"
 #include <Camera.h>
+#include "Software_Caster.h"
 
 const int WINDOW_X = 1920;
 const int WINDOW_Y = 1080;
@@ -67,6 +68,7 @@ int main() {
 
 	// Initialize the raycaster hardware, compat, or software
 	RayCaster *rc = new Hardware_Caster();
+	//RayCaster *rc = new Software_Caster();
 	if (rc->init() != 1) {
 		delete rc;
 		// rc = new Hardware_Caster_Compat();
@@ -95,8 +97,8 @@ int main() {
 	rc->create_viewport(WINDOW_X, WINDOW_Y, 50.0f, 80.0f);
 
 	Light l;
-	l.direction_cartesian = sf::Vector3f(1.0f, 1.0f, 0.0f);
-	l.position = sf::Vector3f(10.0f, 10.0f, 10.0f);
+	l.direction_cartesian = sf::Vector3f(1.5f, 1.2f, 0.5f);
+	l.position = sf::Vector3f(100.0f, 100.0f, 100.0f);
 	l.rgbi = sf::Vector4f(0.3f, 0.4f, 0.3f, 1.0f);
 
 	rc->assign_lights(std::vector<Light>{l});
@@ -125,7 +127,9 @@ int main() {
 	// Mouse capture
 	sf::Vector2i deltas;
 	sf::Vector2i fixed(window.getSize());
+	sf::Vector2i prev_pos;
 	bool mouse_enabled = true;
+	bool reset = false;
 
 	while (window.isOpen()) {
 
@@ -142,6 +146,8 @@ int main() {
 						mouse_enabled = false;
 					else
 						mouse_enabled = true;
+				} if (event.key.code == sf::Keyboard::R) {
+					reset = true;
 				}
 			}
 		}
@@ -174,11 +180,18 @@ int main() {
 		}
 
 		if (mouse_enabled) {
-			deltas = fixed - sf::Mouse::getPosition();
+			if (reset) {
+				reset = false;
+				sf::Mouse::setPosition(sf::Vector2i(2560/2, 1080/2));
+				prev_pos = sf::Vector2i(2560 / 2, 1080 / 2);
+			}
+
+			deltas = prev_pos - sf::Mouse::getPosition();
 			if (deltas != sf::Vector2i(0, 0) && mouse_enabled == true) {
 
 				// Mouse movement
-				sf::Mouse::setPosition(fixed);
+				//sf::Mouse::setPosition(fixed);
+				prev_pos = sf::Mouse::getPosition();
 				camera->slew_camera(sf::Vector2f(
 					deltas.y / 300.0f,
 					deltas.x / 300.0f