73 lines
1.8 KiB
C
73 lines
1.8 KiB
C
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#include <string.h>
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#include <cglm/cam.h>
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#include <GL/glew.h>
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#include "include/camera.h"
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struct camera *create_camera(int type) {
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if (type != CAMERA_PERSPECTIVE &&
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type != CAMERA_ORTHOGONAL) {
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return NULL;
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}
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struct camera *c = malloc(sizeof(struct camera));
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if (c == NULL) {
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return NULL;
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}
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memset(c, 0, sizeof(struct camera));
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c->type = type;
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c->fov = 80.0f;
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c->near_z = 0.01f;
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c->far_z = 1000.0f;
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c->yaw = -90.0f;
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c->pitch = 0.0f;
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c->sensitivity = 0.02f;
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if (c->type == CAMERA_ORTHOGONAL) {
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c->viewport_modifier = 0.5f;
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}
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c->pos[0] = 0.0f;
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c->pos[1] = 0.0f;
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c->pos[2] = 10.0f;
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c->front[0] = 0.0f;
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c->front[1] = 0.0f;
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c->front[2] = -1.0f;
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c->up[0] = 0.0f;
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c->up[1] = 1.0f;
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c->up[2] = 0.0f;
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return c;
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}
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int bake_camera(struct camera *c) {
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glm_mat4_identity(c->view);
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glm_vec3_add(c->pos, c->front, c->center);
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glm_lookat(c->pos, c->center, c->up, c->view);
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glm_mat4_identity(c->projection);
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int screen_viewport[4];
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glGetIntegerv(GL_VIEWPORT, screen_viewport);
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if (c->type == CAMERA_PERSPECTIVE) {
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glm_perspective(glm_rad(c->fov),
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(float) ((float)screen_viewport[2]/(float)screen_viewport[3]),
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c->near_z, c->far_z,
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c->projection);
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} else if (c->type == CAMERA_ORTHOGONAL) {
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float left = -screen_viewport[2]/2 * c->viewport_modifier;
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float right = screen_viewport[2]/2 * c->viewport_modifier;
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float top = screen_viewport[3]/2 * c->viewport_modifier;
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float bottom = -screen_viewport[3]/2 * c->viewport_modifier;
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glm_ortho(left, right, bottom, top, c->near_z, c->far_z, c->projection);
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} else {
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return -1;
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}
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return 0;
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}
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