Working barebones heightmap renderer

1 files changed, 0 insertions, 285 deletions

diff --git a/src/main.c b/src/main.c
deleted file mode 100644
index cbe13d8..0000000
--- a/src/main.c
+++ /dev/null
@@ -1,285 +0,0 @@
-#include <GL/glew.h> // must come before glfw3
-#include <GLFW/glfw3.h>
-#include <stdio.h>
-#include <math.h>
-
-#include "player.h"
-
-// TODO: move to implicit map definition with level editor in future
-#define MAP_HEIGHT 20
-#define MAP_WIDTH 10
-int world_map[MAP_HEIGHT][MAP_WIDTH] = {
-    {1, 1, 1, 1, 1, 1, 1, 1, 1, 1},
-    {1, 0, 0, 0, 0, 0, 0, 0, 0, 1},
-    {1, 0, 2, 2, 2, 0, 0, 0, 0, 1},
-    {1, 0, 2, 2, 2, 0, 0, 0, 0, 1},
-    {1, 0, 2, 2, 2, 0, 0, 0, 0, 1},
-    {1, 0, 2, 2, 2, 0, 0, 0, 0, 1},
-    {1, 0, 2, 2, 2, 0, 4, 4, 0, 1},
-    {1, 0, 0, 0, 0, 0, 4, 4, 0, 1},
-    {1, 0, 0, 0, 0, 0, 4, 4, 0, 1},
-    {1, 0, 0, 0, 0, 0, 4, 4, 0, 1},
-    {1, 0, 0, 0, 0, 0, 4, 4, 0, 1},
-    {1, 0, 0, 0, 0, 0, 4, 4, 0, 1},
-    {1, 0, 0, 0, 0, 0, 4, 4, 0, 1},
-    {1, 0, 3, 3, 3, 0, 4, 4, 0, 1},
-    {1, 0, 3, 3, 3, 0, 0, 0, 0, 1},
-    {1, 0, 3, 3, 3, 0, 0, 0, 0, 1},
-    {1, 0, 3, 3, 3, 0, 0, 0, 0, 1},
-    {1, 0, 3, 3, 3, 0, 0, 0, 0, 1},
-    {1, 0, 0, 0, 0, 0, 0, 0, 0, 1},
-    {1, 1, 1, 1, 1, 1, 1, 1, 1, 1},
-};
-
-typedef struct {
-	unsigned char r, g, b;
-} ColorRGB;
-
-// honest- this function can from chatgpt- cross-reference this with other raycasting guides
-void raycast(Player *player, GLubyte *pixels, int width, int height) {
-    	int screen_width = width;
-    	int screen_height = height;
-
-    	for (int x = 0; x < screen_width; ++x) {
-        	// Calculate ray position and direction
-        	double camera_x = 2.0 * x / (double)screen_width - 1; // x-coordinate in camera space
-        	double ray_dir_x = player->dir_x + player->plane_x * camera_x;
-        	double ray_dir_y = player->dir_y + player->plane_y * camera_x;
-
-        	// Which box of the map we're in
-        	int map_x = (int)player->pos_x;
-        	int map_y = (int)player->pos_y;
-
-        	// Length of ray from one x or y-side to next x or y-side
-        	double delta_dist_x = fabs(1 / ray_dir_x);
-        	double delta_dist_y = fabs(1 / ray_dir_y);
-
-        	// Length of ray from current position to next x or y-side
-        	double side_dist_x;
-        	double side_dist_y;
-
-        	// Direction to step in x or y-direction (either +1 or -1)
-        	int step_x;
-        	int step_y;
-
-        	// Was a wall hit?
-        	int hit = 0;
-        	// Was the wall hit a wall facing north, east-west, or south?
-        	int side;
-        	if (ray_dir_x < 0) {
-            		step_x = -1;
-            		side_dist_x = (player->pos_x - map_x) * delta_dist_x;
-        	} else {
-            		step_x = 1;
-            		side_dist_x = (map_x + 1.0 - player->pos_x) * delta_dist_x;
-        	}
-        	if (ray_dir_y < 0) {
-            		step_y = -1;
-            		side_dist_y = (player->pos_y - map_y) * delta_dist_y;
-        	} else {
-            		step_y = 1;
-            		side_dist_y = (map_y + 1.0 - player->pos_y) * delta_dist_y;
-        	}
-
-        	// Perform DDA
-        	while (hit == 0) {
-            		// Jump to next map square
-            		if (side_dist_x < side_dist_y) {
-                		side_dist_x += delta_dist_x;
-                		map_x += step_x;
-                		side = (ray_dir_x > 0) ? 0 : 2;
-            		} else {
-                		side_dist_y += delta_dist_y;
-                		map_y += step_y;
-                		side = 1;
-            		}
-            		// Check if ray has hit a wall
-            		if (world_map[map_x][map_y] > 0) { hit = 1; }
-        	}
-
-		// calculate distance projected on camera direction
-		double perp_wall_dist;
-		if (side == 0 || side == 2) { perp_wall_dist = (map_x - player->pos_x + (1 - step_x) / 2) / ray_dir_x; }
-		else           { perp_wall_dist = (map_y - player->pos_y + (1 - step_y) / 2) / ray_dir_y; }
-
-		// fog effect
-		float fog_distance = 15.0f;
-		float scale_factor = 1.0f - perp_wall_dist / fog_distance;
-		if (scale_factor < 0.0f) { scale_factor = 0.0f; }
-		
-		// calculate height of line on screen
-		int line_height = (int)(screen_height / perp_wall_dist);
-		//int draw_start = -line_height / 2 + screen_height / 2;
-		//if (draw_start < 0) { draw_start = 0; }
-		//int draw_end = line_height / 2 + screen_height / 2;
-		//if (draw_end >= screen_height)  { draw_end = screen_height - 1; }
-		int pitch = screen_height / 2 * player->look_angle;
-		int start_y = -line_height / 2 + screen_height / 2 + pitch;
-		if (start_y < 0) { start_y = 0; }
-		int end_y = line_height / 2 + screen_height / 2 + pitch;
-		if (end_y >= screen_height) { end_y = screen_height - 1; }
-
-
-		// colors :)
-		ColorRGB color;
-		if (world_map[map_x][map_y] == 1)	color = (ColorRGB){.r = 255, .g = 255, .b = 255};
-		else if (world_map[map_x][map_y] == 2)	color = (ColorRGB){.r = 255, .g = 0, .b = 0};
-		else if (world_map[map_x][map_y] == 3)	color = (ColorRGB){.r = 0, .g = 255, .b = 0};
-		else if (world_map[map_x][map_y] == 4)	color = (ColorRGB){.r = 0, .g = 0, .b = 255};
-		else					color = (ColorRGB){.r = 0, .g = 0, .b = 0};
-
-		if (side == 1) {
-			color.r /= 2;
-			color.g /= 2;
-			color.b /= 2;
-		} else if (side == 2) {
-			color.r /= 4;
-			color.g /= 4;
-			color.b /= 4;
-		}
-
-		// scale brightness in accordance with distance (for fog)
-		color.r *= scale_factor;
-		color.g *= scale_factor;
-		color.b *= scale_factor;
-
-		int index;
-		for (int y = 0; y < screen_height; y++) {
-			index = y * screen_width * 3 + x * 3;
-			if (y >= start_y && y <= end_y) {
-				// draw something
-				pixels[index] = color.r;
-				pixels[index+1] = color.g;
-				pixels[index+2] = color.b;
-			} else {
-				// fill blank space
-				pixels[index] = 0;	
-				pixels[index+1] = 0;	
-				pixels[index+2] = 0;	
-			}
-		}
-
-    	}
-}
-
-int main(int argc, char *argv[]) {
-	GLFWwindow* window;
-
-	double mouse_x;
-	double mouse_y;
-
-	// init player
-	Player player;
-	player.pos_y = 2.0f;
-	player.pos_x = 9.0f;
-	player.dir_x = 1.0f;
-	player.dir_y = 0.0f;
-	player.plane_x = 0.20f; // FOV related
-	player.plane_y = 0.90f; // FOV related
-	player.look_angle = 0.0f;
-	player.move_speed = 0.035f;
-	player.sensitivity = 0.001f;
-
-	// initiate glfw library
-	if (!glfwInit()){
-		printf("Failed to initiate GLFW.\n");
-		return -1;
-	}
-
-	// create glfw window
-	GLFWmonitor* primary = glfwGetPrimaryMonitor();
-	const GLFWvidmode* mode = glfwGetVideoMode(primary);
-	//window = glfwCreateWindow(800, 600, "raycaster", NULL, NULL);
-	window = glfwCreateWindow(mode->width, mode->height, "raycaster", primary, NULL);
-	if (!window){
-		printf("Failed to create GLFW window.\n");
-		glfwTerminate();
-		return -1;
-	}
-
-	// make window current
-	glfwMakeContextCurrent(window);
-	glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_DISABLED);
-
-	// update mouse position
-	// glfwGetCursorPos(window, &mouse_x, &mouse_y);
-	mouse_x -= mode->width / 2;
-	mouse_y -= mode->height / 2;
-
-	// setup orthographic projection camera
-	glMatrixMode(GL_PROJECTION);
-	glLoadIdentity();
-	glOrtho(0.0, mode->width, mode->height, 0.0, -1.0, 1.0);
-	glMatrixMode(GL_MODELVIEW);
-
-	// TODO: move timers into a header
-	double last_time = glfwGetTime();
-	int nb_frames = 0;
-	// TODO: render FPS with freetype or something as opposed to updating title
-	char title[200];
-
-	// setup pbo for optimized performance
-	if (glewInit() != GLEW_OK) { 
-		printf("Failed to initiate GLEW.\n");
-		return -1;
-	}
-	GLuint pbo = 0;
-
-	glGenBuffers(1, &pbo);
-	glBindBuffer(GL_PIXEL_UNPACK_BUFFER, pbo);
-	glBufferData(GL_PIXEL_UNPACK_BUFFER, mode->width * mode->height * 3, 0, GL_STREAM_DRAW);
-
-	int index = 0;
-	glViewport(0, 0, mode->width, mode->height);
-	while (!glfwWindowShouldClose(window)) {
-
-		// Stop loop if window isn't focused
-		if(!glfwGetWindowAttrib(window, GLFW_FOCUSED)){
-			continue;
-		}
-
-		// timing section
-		double current_time = glfwGetTime();
-		nb_frames++;
-		if (current_time - last_time >= 1.0) {
-			sprintf(title, "FPS: %d", nb_frames);
-			glfwSetWindowTitle(window, title);
-			nb_frames = 0;
-			last_time += 1.0;
-		}
-
-
-		// clear window
-		glClear(GL_COLOR_BUFFER_BIT);
-		glLoadIdentity();
-
-		// main raycast function
-        float prev_position[2] = {player.pos_x, player.pos_y};
-		move_player(&player, window, &mouse_x, &mouse_y, mode->width, mode->height);
-        if (world_map[(int)player.pos_x][(int)player.pos_y] != 0) {
-            player.pos_x = prev_position[0];
-            player.pos_y = prev_position[1];
-        }
-		GLubyte* pixels = (GLubyte*)glMapBuffer(GL_PIXEL_UNPACK_BUFFER, GL_WRITE_ONLY);
-		raycast(&player, pixels, mode->width, mode->height);
-
-		// pbo
-		glUnmapBuffer(GL_PIXEL_UNPACK_BUFFER);
-		glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
-		glPixelStorei(GL_UNPACK_ROW_LENGTH, mode->width);
-		glWindowPos2i(0, 0);
-		glDrawPixels(mode->width, mode->height, GL_RGB, GL_UNSIGNED_BYTE, 0);
-
-		
-		glfwSwapBuffers(window);
-		glfwPollEvents();
-
-	}
-
-	printf("Terminating GLFW...\n");
-	glfwTerminate();
-	printf("Clearing buffer...\n");
-	glDeleteBuffers(1, &pbo);
-	return 0;
-
-}