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#include <GL/glew.h> // must come before glfw3
#include <GLFW/glfw3.h>
#include <stdio.h>
#include <math.h>
#define MAP_HEIGHT 10
#define MAP_WIDTH 10
int height_map[MAP_WIDTH][MAP_HEIGHT] = {
{0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
{0, 1, 1, 1, 1, 1, 1, 1, 1, 0},
{0, 1, 3, 3, 3, 3, 3, 3, 1, 0},
{0, 1, 3, 5, 5, 5, 5, 3, 1, 0},
{0, 1, 3, 5, 8, 8, 5, 3, 1, 0},
{0, 1, 3, 5, 8, 8, 5, 3, 1, 0},
{0, 1, 3, 5, 5, 5, 5, 3, 1, 0},
{0, 1, 3, 3, 3, 3, 3, 3, 1, 0},
{0, 1, 1, 1, 1, 1, 1, 1, 1, 0},
{0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
};
// TODO: move into dedicated camera struct
// Define the perspective projection matrix
void perspective(float fov, float aspect, float near, float far, float *mat) {
float f = 1.0f / tan(fov * 0.5f);
mat[0] = f / aspect;
mat[1] = 0.0f;
mat[2] = 0.0f;
mat[3] = 0.0f;
mat[4] = 0.0f;
mat[5] = f;
mat[6] = 0.0f;
mat[7] = 0.0f;
mat[8] = 0.0f;
mat[9] = 0.0f;
mat[10] = (far + near) / (near - far);
mat[11] = -1.0f;
mat[12] = 0.0f;
mat[13] = 0.0f;
mat[14] = (2.0f * far * near) / (near - far);
mat[15] = 0.0f;
}
float camera_pos_x = 0.0f;
float camera_pos_y = 0.0f;
float camera_pos_z = 0.0f;
float camera_yaw = 0.0f; // rotation around y-axis
float camera_pitch = 0.0f; // rotation aroudn x-axis
void renderHeightMap() {
float colors[3][3] = {
{0.0f, 1.0f, 0.0f}, // Green
{0.5f, 0.5f, 0.5f}, // Gray
{1.0f, 1.0f, 1.0f} // White
};
float scale_factor = 1.0f;
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glTranslatef(-camera_pos_x, -camera_pos_y, -camera_pos_z);
glRotatef(-camera_pitch, 1.0f, 0.0f, 0.0f);
glRotatef(-camera_yaw, 0.0f, 1.0f, 0.0f);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(-10.0, 10.0, -10.0, 10.0, -20.0, 20.0);
for (int x = 0; x < MAP_WIDTH - 1; x++) { // Adjusted loop bounds
glBegin(GL_TRIANGLE_STRIP);
for (int y = 0; y < MAP_HEIGHT; y++) {
float x0 = x;
float y0 = height_map[x][y] * scale_factor;
float z0 = y;
float x1 = x + 1; // Adjusted x1
float y1 = height_map[x+1][y] * scale_factor; // Adjusted indexing
float z1 = y;
float* color = colors[0];
if (y0 < 1.0f) { color = colors[1]; }
if (y0 < 0.5f) { color = colors[2]; }
glColor3fv(color);
glVertex3f(x0, y0, z0);
glVertex3f(x1, y1, z1);
}
glEnd();
}
// draw grid
glColor3f(0.0f, 0.0f, 0.0f);
glLineWidth(1.0f);
glBegin(GL_LINES);
// Draw vertical grid lines
for (int x = 0; x <= MAP_WIDTH; x++) {
for (int y = 0; y < MAP_HEIGHT; y++) {
glVertex3f(x, height_map[x][y] * scale_factor, y);
glVertex3f(x, height_map[x][y + 1] * scale_factor, y + 1);
}
}
// Draw horizontal grid lines
for (int y = 0; y <= MAP_HEIGHT; y++) {
for (int x = 0; x < MAP_WIDTH; x++) {
glVertex3f(x, height_map[x][y] * scale_factor, y);
glVertex3f(x + 1, height_map[x + 1][y] * scale_factor, y);
}
}
glEnd();
}
void key_callback(GLFWwindow* window, int key, int scancode, int action, int mods) {
const float camera_speed = 0.5f;
if (key == GLFW_KEY_W && action == GLFW_PRESS) { camera_pos_z -= camera_speed; }
else if (key == GLFW_KEY_S && action == GLFW_PRESS) { camera_pos_z += camera_speed; }
else if (key == GLFW_KEY_A && action == GLFW_PRESS) { camera_pos_x -= camera_speed; }
else if (key == GLFW_KEY_D && action == GLFW_PRESS) { camera_pos_x += camera_speed; }
else if (key == GLFW_KEY_Q && action == GLFW_PRESS) { camera_pitch -= camera_speed; }
else if (key == GLFW_KEY_E && action == GLFW_PRESS) { camera_pitch += camera_speed; }
else if (key == GLFW_KEY_Z && action == GLFW_PRESS) { camera_yaw -= camera_speed; }
else if (key == GLFW_KEY_C && action == GLFW_PRESS) { camera_yaw += camera_speed; }
}
int main(int argc, char *argv[]) {
GLFWwindow* window;
// 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(mode->width, mode->height, "raycaster", primary, NULL);
if (!window){
printf("Failed to create GLFW window.\n");
glfwTerminate();
return -1;
}
// make window current
glfwMakeContextCurrent(window);
glewExperimental = GL_TRUE;
GLenum err = glewInit();
if (err != GLEW_OK) {
printf("GLEW init error");
return -1;
}
// enable depth testing
glEnable(GL_DEPTH_TEST);
glfwSetKeyCallback(window, key_callback);
while (!glfwWindowShouldClose(window)) {
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
renderHeightMap();
glfwSwapBuffers(window); // Swap buffers to display the rendered image
// Poll for and process events, wait for events if none are pending
glfwWaitEventsTimeout(0.01); // Add a slight delay to reduce CPU usage
}
printf("Terminating GLFW...\n");
glfwTerminate();
return 0;
}
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