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Diffstat (limited to 'include/camera.h')
-rw-r--r-- | include/camera.h | 93 |
1 files changed, 93 insertions, 0 deletions
diff --git a/include/camera.h b/include/camera.h new file mode 100644 index 0000000..983dae8 --- /dev/null +++ b/include/camera.h @@ -0,0 +1,93 @@ +#ifndef HONEY_CAMERA_H +#define HONEY_CAMERA_H + +/* @file camera.h + * + * @brief Define the basic honey_camera struct, associated functions, + * and common camera variants. + */ + +#include "common.h" + +enum honey_camera_projection { + HONEY_PERSPECTIVE, + HONEY_ORTHOGRAPHIC, +}; + +typedef struct { + vec3 position; + vec3 angle; /* pitch, yaw, roll */ + vec3 look_direction; + vec3 up; + vec3 right; + mat4 view; + mat4 projection; + enum honey_camera_projection projection_type; + float aspect_ratio; + float near, far; + float fov; + float ortho_left; + float ortho_right; + float ortho_top; + float ortho_bottom; +} honey_camera; + +/** @brief Create a new camera. + * + * @param[out] camera Pointer to the destination honey_camera. + * @param[in] position The position of the camera. + * @param[in] angle The Euler angles (pitch, yaw, roll) of the camera. + * @param[in] projection The type of projection to use. + * @param[in] projection_parameters The parameters to use for the projection matrix. + * Use honey_perspective_parameters for a perspective projection and + * honey_orthographic_parameters for an orthographic projection. + */ +void honey_camera_new(honey_camera* camera, + vec3 position, + vec3 angle, + enum honey_camera_projection projection_type, + float aspect_ratio, + float near, float far, + float fov, + float left, float right, float top, float bottom); + +void honey_camera_new_perspective(honey_camera* camera, + vec3 position, + vec3 angle, + float aspect_ratio, + float near, float far, + float fov); + +void honey_camera_new_orthographic(honey_camera* camera, + vec3 position, + vec3 angle, + float near, float far, + float left, float right, float top, float bottom); + +/** @brief (Re-)Calculate a camera's look_direction. + * + * @param[in] Pointer to the camera to re-calculate. + */ +void honey_camera_calculate_look_direction(honey_camera* camera); + +void honey_camera_calculate_up(honey_camera* camera); +void honey_camera_calculate_right(honey_camera* camera); + +/** @brief (Re-)Calculate a camera's view matrix. + * + * This function need only be called when the camera has been moved in some way. + * + * @param[in] camera Pointer to the camera to re-calculate. + */ +void honey_camera_calculate_view(honey_camera* camera); + +/** @brief (Re-)Calculate a camera's projection matrix. + * + * This function need only be called when the projection has changes in some way. + * Most commonly, this would be changing the FOV. + * + * @param[in] camera Pointer to the camera to re-calculate. + */ +void honey_camera_calculate_projection(honey_camera* camera); + +#endif |