cam_mode_unused_ahead.c

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#include "common.h"
 
// implements CAM_UPDATE_UNUSED_AHEAD
// this mode is completely unused in vanilla; it doesn't even have a case in update_cameras
// seems to be based on CAM_UPDATE_NO_INTERP (the one used for battle cam)
// tracks a point 400 units ahead of player position in the z-direction and 60 units above
// defaults to a relatively short boom length and no pitch angle, resulting in a head-on direct view
//
// control parameters:
// dist -- length of the camera boom arm
// pitch -- rising angle of the boom arm, up toward the y-axis
// yaw -- yaw angle for the boom arm in the xz-plane
// skipRecalc -- do not calculate lookAt_obj and lookAt_eye from params
void update_camera_unused_ahead(Camera* camera) {
    f32 yawAngle, sinYaw, cosYaw;
    f32 pitchAngle, sinPitch, cosPitch;
    f32 dx, dy, dz, dr;
 
    if (camera->needsInit || camera->needsReinit) {
        camera->needsInit = FALSE;
        camera->needsReinit = FALSE;
        camera->params.basic.skipRecalc = FALSE;
        camera->params.basic.dist = 100;
        camera->params.basic.pitch = 0;
        camera->params.basic.yaw = 0;
        camera->params.basic.fovScale = 100;
 
        camera->lookAt_obj.x = camera->lookAt_obj_target.x;
        camera->lookAt_obj.y = camera->lookAt_obj_target.y;
        camera->lookAt_obj.z = camera->lookAt_obj_target.z;
    }
 
    if (!(gPlayerStatus.flags & (PS_FLAG_FALLING | PS_FLAG_JUMPING))) {
        camera->lookAt_obj_target.y = gPlayerStatus.pos.y + 60.0f;
    }
    camera->lookAt_obj_target.x = gPlayerStatus.pos.x;
    camera->lookAt_obj_target.z = gPlayerStatus.pos.z + 400.0f;
 
    if (!camera->params.basic.skipRecalc) {
        camera->lookAt_obj.x = camera->lookAt_obj_target.x;
        camera->lookAt_obj.y = camera->lookAt_obj_target.y;
        camera->lookAt_obj.z = camera->lookAt_obj_target.z;
 
        camera->curBoomYaw = camera->params.basic.yaw;
        camera->curBoomPitch = camera->params.basic.pitch;
        camera->curBoomLength = camera->params.basic.dist;
        camera->vfov = (10000 / camera->params.basic.fovScale) / 4;
 
        pitchAngle = DEG_TO_RAD(camera->curBoomPitch);
        sinPitch = sin_rad(pitchAngle);
        cosPitch = cos_rad(pitchAngle);
 
        yawAngle = DEG_TO_RAD(camera->curBoomYaw);
        sinYaw = sin_rad(yawAngle);
        cosYaw = cos_rad(yawAngle);
 
        dy = camera->curBoomLength * sinPitch;
        dx = camera->curBoomLength * cosPitch * -sinYaw;
        dz = camera->curBoomLength * cosPitch * cosYaw;
 
        camera->lookAt_eye.x = camera->lookAt_obj.x + dx;
        camera->lookAt_eye.y = camera->lookAt_obj.y + dy;
        camera->lookAt_eye.z = camera->lookAt_obj.z + dz;
    }
 
    dx = camera->lookAt_obj.x - camera->lookAt_eye.x;
    dy = camera->lookAt_obj.y - camera->lookAt_eye.y;
    dz = camera->lookAt_obj.z - camera->lookAt_eye.z;
    dr = sqrtf(SQ(dx) + SQ(dz));
 
    camera->lookAt_yaw = -atan2(0.0f, 0.0f, dx, dz);
    camera->lookAt_pitch = atan2(0.0f, 0.0f, dy, -dr);
    camera->curYaw = atan2(camera->lookAt_eye.x, camera->lookAt_eye.z, camera->lookAt_obj.x, camera->lookAt_obj.z);
}