ray: libize raytracer core, introduces src/libs

This is the first step of breaking out all the core rendering stuffs
into reusable libraries and making modules purely compositional,
consumers of various included rendering/effects libraries.

Expect multiple modules leveraging libray for a variety of scenes and
such.  Also expect compositions mixing the various libraries for more
interesting visuals.

1 files changed, 0 insertions, 84 deletions

diff --git a/src/modules/ray/ray_camera.h b/src/modules/ray/ray_camera.h
deleted file mode 100644
index e393beb..0000000
--- a/src/modules/ray/ray_camera.h
+++ /dev/null
@@ -1,84 +0,0 @@
-#ifndef _RAY_CAMERA_H
-#define _RAY_CAMERA_H
-
-#include <math.h>
-
-#include "fb.h"
-
-#include "ray_3f.h"
-#include "ray_euler.h"
-#include "ray_ray.h"
-
-
-typedef struct ray_camera_t {
-	ray_3f_t	position;		/* position of camera, the origin of all its rays */
-	ray_euler_t	orientation;		/* orientation of the camera */
-	float		focal_length;		/* controls the field of view */
-	unsigned	width;			/* width of camera viewport in pixels */
-	unsigned	height;			/* height of camera viewport in pixels */
-} ray_camera_t;
-
-
-typedef struct ray_camera_frame_t {
-	const ray_camera_t	*camera;		/* the camera supplied to frame_begin() */
-
-	ray_3f_t		nw, ne, sw, se;		/* directions pointing through the corners of the frame fragment */
-	float			x_delta, y_delta;	/* interpolation step delta along the x and y axis */
-} ray_camera_frame_t;
-
-
-typedef struct ray_camera_fragment_t {
-	ray_camera_frame_t	*frame;			/* the frame supplied to fragment_begin() */
-	fb_fragment_t		*fb_fragment;		/* the fragment supplied to fragment_begin() */
-	ray_ray_t		*ray;			/* the ray supplied to frame_begin(), which gets updated as we step through the frame. */
-
-	ray_3f_t		cur_w, cur_e;		/* current row's west and east ends */
-	float			x_alpha, y_alpha;	/* interpolation position along the x and y axis */
-	unsigned		x, y;			/* integral position within frame fragment */
-} ray_camera_fragment_t;
-
-
-void ray_camera_frame_prepare(const ray_camera_t *camera, ray_camera_frame_t *res_frame);
-void ray_camera_fragment_begin(ray_camera_frame_t *frame, fb_fragment_t *fb_fragment, ray_ray_t *res_ray, ray_camera_fragment_t *res_fragment);
-
-
-/* Step the ray through the fragment on the x axis, returns 1 when rays remain on this axis, 0 at the end. */
-/* When 1 is returned, fragment->ray is left pointing through the new coordinate. */
-static inline int ray_camera_fragment_x_step(ray_camera_fragment_t *fragment)
-{
-	fragment->x++;
-
-	if (fragment->x >= fragment->fb_fragment->width) {
-		fragment->x = 0;
-		fragment->x_alpha = fragment->frame->x_delta * (float)fragment->fb_fragment->x;
-		return 0;
-	}
-
-	fragment->x_alpha += fragment->frame->x_delta;
-	fragment->ray->direction = ray_3f_nlerp(&fragment->cur_w, &fragment->cur_e, fragment->x_alpha);
-
-	return 1;
-}
-
-
-/* Step the ray through the fragment on the y axis, returns 1 when rays remain on this axis, 0 at the end. */
-/* When 1 is returned, fragment->ray is left pointing through the new coordinate. */
-static inline int ray_camera_fragment_y_step(ray_camera_fragment_t *fragment)
-{
-	fragment->y++;
-
-	if (fragment->y >= fragment->fb_fragment->height) {
-		fragment->y = 0;
-		fragment->y_alpha = fragment->frame->y_delta * (float)fragment->fb_fragment->y;
-		return 0;
-	}
-
-	fragment->y_alpha += fragment->frame->y_delta;
-	fragment->cur_w = ray_3f_lerp(&fragment->frame->nw, &fragment->frame->sw, fragment->y_alpha);
-	fragment->cur_e = ray_3f_lerp(&fragment->frame->ne, &fragment->frame->se, fragment->y_alpha);
-	fragment->ray->direction = ray_3f_nlerp(&fragment->cur_w, &fragment->cur_e, fragment->x_alpha);
-
-	return 1;
-}
-
-#endif