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-rw-r--r--2d/sprite.scm230
1 files changed, 109 insertions, 121 deletions
diff --git a/2d/sprite.scm b/2d/sprite.scm
index 6076c0d..fddfaa4 100644
--- a/2d/sprite.scm
+++ b/2d/sprite.scm
@@ -36,7 +36,7 @@
#:use-module (2d vector))
;;;
-;;; Sprites
+;;; Sprite Vertices
;;;
;; Used to build OpenGL vertex array for a sprite.
@@ -53,11 +53,55 @@
(s float)
(t float))
+(define (pack-sprite-vertices vertices offset x y width height origin-x origin-y
+ scale-x scale-y rotation u v u2 v2 color)
+ (let* ((color (rgba->gl-color color))
+ (sin (sin-degrees rotation))
+ (cos (cos-degrees rotation))
+ (local-x1 (* (- origin-x) scale-x))
+ (local-y1 (* (- origin-y) scale-y))
+ (local-x2 (* (- width origin-x) scale-x))
+ (local-y2 (* (- height origin-y) scale-y))
+ (x1 (+ x (- (* cos local-x1) (* sin local-y1))))
+ (y1 (+ y (* sin local-x1) (* cos local-y1)))
+ (x2 (+ x (- (* cos local-x1) (* sin local-y2))))
+ (y2 (+ y (* sin local-x1) (* cos local-y2)))
+ (x3 (+ x (- (* cos local-x2) (* sin local-y2))))
+ (y3 (+ y (* sin local-x2) (* cos local-y2)))
+ (x4 (+ x1 (- x3 x2)))
+ (y4 (- y3 (- y2 y1)))
+ (r (vector-ref color 0))
+ (g (vector-ref color 1))
+ (b (vector-ref color 2))
+ (a (vector-ref color 3)))
+ ;; Vertices go counter clockwise, starting from the top-left
+ ;; corner.
+ (pack vertices offset sprite-vertex
+ x1 y1
+ r g b a
+ u v)
+ (pack vertices (+ offset 1) sprite-vertex
+ x2 y2
+ r g b a
+ u v2)
+ (pack vertices (+ offset 2) sprite-vertex
+ x3 y3
+ r g b a
+ u2 v2)
+ (pack vertices (+ offset 3) sprite-vertex
+ x4 y4
+ r g b a
+ u2 v)))
+
+;;;
+;;; Sprites
+;;;
+
;; The <sprite> type represents a drawable object (texture,
;; texture-region, animation, etc.) with a given position, scale,
;; rotation, and color.
(define-record-type <sprite>
- (%make-sprite drawable position scale rotation color anchor vertices animation-state)
+ (%make-sprite drawable position scale rotation color anchor vertices dirty animation-state)
sprite?
(drawable sprite-drawable set-sprite-drawable!)
(position sprite-position %set-sprite-position!)
@@ -76,7 +120,7 @@
(animation-state (if (animation? drawable)
(make-animation-state drawable)
#f)))
- (%make-sprite drawable position scale rotation color anchor vertices animation-state)))
+ (%make-sprite drawable position scale rotation color anchor vertices #t animation-state)))
(define-syntax-rule (dirty-sprite-setter setter private-setter)
"Defines a setter that calls the private version of the given
@@ -164,40 +208,27 @@ sprite."
(define (update-sprite-vertices! sprite)
"Rebuilds the internal vertex array."
- (let* ((vertices (sprite-vertices sprite))
- (texture (sprite-texture sprite))
- (size (sprite-drawable-size sprite))
- (color (rgba->gl-color (sprite-color sprite)))
- (anchor (sprite-anchor-vector sprite))
- (tex-coords (sprite-texture-coords sprite))
- (x (- (vx anchor)))
- (y (- (vy anchor)))
- (x2 (+ x (vx size)))
- (y2 (+ y (vy size)))
- (u (first tex-coords))
- (v (second tex-coords))
- (u2 (third tex-coords))
- (v2 (fourth tex-coords))
- (r (vector-ref color 0))
- (g (vector-ref color 1))
- (b (vector-ref color 2))
- (a (vector-ref color 3)))
- (pack vertices 0 sprite-vertex
- x y
- r g b a
- u v)
- (pack vertices 1 sprite-vertex
- x2 y
- r g b a
- u2 v)
- (pack vertices 2 sprite-vertex
- x2 y2
- r g b a
- u2 v2)
- (pack vertices 3 sprite-vertex
- x y2
- r g b a
- u v2)))
+ (let ((pos (sprite-position sprite))
+ (size (sprite-drawable-size sprite))
+ (scale (sprite-scale sprite))
+ (anchor (sprite-anchor-vector sprite))
+ (tex-coords (sprite-texture-coords sprite)))
+ (pack-sprite-vertices (sprite-vertices sprite)
+ 0
+ (vx pos)
+ (vy pos)
+ (vx size)
+ (vy size)
+ (vx anchor)
+ (vy anchor)
+ (vx scale)
+ (vy scale)
+ (sprite-rotation sprite)
+ (first tex-coords)
+ (second tex-coords)
+ (third tex-coords)
+ (fourth tex-coords)
+ (sprite-color sprite))))
(define (draw-sprite sprite)
"Renders a sprite. A sprite batch will be used if one is currently
@@ -226,16 +257,16 @@ bound."
(vy pos)
(vx size)
(vy size)
- #:color (sprite-color sprite)
- #:rotation (sprite-rotation sprite)
- #:origin-x (vx anchor)
- #:origin-y (vy anchor)
- #:scale-x (vx scale)
- #:scale-y (vy scale)
- #:u (first tex-coords)
- #:v (second tex-coords)
- #:u2 (third tex-coords)
- #:v2 (fourth tex-coords))))
+ (vx anchor)
+ (vy anchor)
+ (vx scale)
+ (vy scale)
+ (sprite-rotation sprite)
+ (first tex-coords)
+ (second tex-coords)
+ (third tex-coords)
+ (fourth tex-coords)
+ (sprite-color sprite))))
(define (draw-sprite-vertex-array sprite)
"Renders a sprite using its internal vertex array."
@@ -248,35 +279,30 @@ bound."
(r-offset (packed-struct-offset sprite-vertex r))
(s-offset (packed-struct-offset sprite-vertex s))
(pointer-type (tex-coord-pointer-type float)))
- (with-gl-push-matrix
- (gl-translate (vx pos) (vy pos) 0)
- (gl-rotate (sprite-rotation sprite) 0 0 1)
- (gl-scale (vx scale) (vy scale) 0)
- ;; Draw vertex array
- (gl-enable-client-state (enable-cap vertex-array))
- (gl-enable-client-state (enable-cap color-array))
- (gl-enable-client-state (enable-cap texture-coord-array))
- (with-gl-bind-texture (texture-target texture-2d) (texture-id texture)
- (set-gl-vertex-array pointer-type
- vertices
- 2
- #:stride struct-size
- #:offset x-offset)
- (set-gl-color-array pointer-type
- vertices
- 4
- #:stride struct-size
- #:offset r-offset)
- (set-gl-texture-coordinates-array pointer-type
- vertices
- #:stride struct-size
- #:offset s-offset)
- (gl-draw-arrays (begin-mode quads)
- 0
- (packed-array-length vertices sprite-vertex)))
- (gl-disable-client-state (enable-cap texture-coord-array))
- (gl-disable-client-state (enable-cap color-array))
- (gl-disable-client-state (enable-cap vertex-array)))))
+ (gl-enable-client-state (enable-cap vertex-array))
+ (gl-enable-client-state (enable-cap color-array))
+ (gl-enable-client-state (enable-cap texture-coord-array))
+ (with-gl-bind-texture (texture-target texture-2d) (texture-id texture)
+ (set-gl-vertex-array pointer-type
+ vertices
+ 2
+ #:stride struct-size
+ #:offset x-offset)
+ (set-gl-color-array pointer-type
+ vertices
+ 4
+ #:stride struct-size
+ #:offset r-offset)
+ (set-gl-texture-coordinates-array pointer-type
+ vertices
+ #:stride struct-size
+ #:offset s-offset)
+ (gl-draw-arrays (begin-mode quads)
+ 0
+ (packed-array-length vertices sprite-vertex)))
+ (gl-disable-client-state (enable-cap texture-coord-array))
+ (gl-disable-client-state (enable-cap color-array))
+ (gl-disable-client-state (enable-cap vertex-array))))
(export make-sprite
sprite?
@@ -324,10 +350,8 @@ bound."
"Adds a textured quad to the current zsprite batch."
(apply %sprite-batch-draw *sprite-batch* args))
-(define* (%sprite-batch-draw batch texture x y width height #:optional #:key
- (origin-x 0) (origin-y 0) (scale-x 1) (scale-y 1)
- (rotation 0) (u 0) (v 0) (u2 1) (v2 1)
- (color #xffffffff))
+(define* (%sprite-batch-draw batch texture x y width height origin-x origin-y
+ scale-x scale-y rotation u v u2 v2 color)
"Adds a textured quad to the sprite batch."
;; Render the batch when it's full or the texture changes.
(cond ((= (sprite-batch-size batch) (sprite-batch-max-size batch))
@@ -336,47 +360,11 @@ bound."
(sprite-batch-switch-texture batch texture)))
;; Add 4 new vertices, taking into account scaling and rotation.
- (let* ((base (* 4 (sprite-batch-size batch)))
- (vertices (sprite-batch-vertices batch))
- (color (rgba->gl-color color))
- (sin (sin-degrees rotation))
- (cos (cos-degrees rotation))
- (world-origin-x (+ origin-x x))
- (world-origin-y (+ origin-y y))
- (local-x1 (* (- origin-x) scale-x))
- (local-y1 (* (- origin-y) scale-y))
- (local-x2 (* (- width origin-x) scale-x))
- (local-y2 (* (- height origin-y) scale-y))
- (x1 (+ world-origin-x (- (* cos local-x1) (* sin local-y1))))
- (y1 (+ world-origin-y (* sin local-x1) (* cos local-y1)))
- (x2 (+ world-origin-x (- (* cos local-x1) (* sin local-y2))))
- (y2 (+ world-origin-y (* sin local-x1) (* cos local-y2)))
- (x3 (+ world-origin-x (- (* cos local-x2) (* sin local-y2))))
- (y3 (+ world-origin-y (* sin local-x2) (* cos local-y2)))
- (x4 (+ x1 (- x3 x2)))
- (y4 (- y3 (- y2 y1)))
- (r (vector-ref color 0))
- (g (vector-ref color 1))
- (b (vector-ref color 2))
- (a (vector-ref color 3)))
- ;; Vertices go counter clockwise, starting from the top-left
- ;; corner.
- (pack vertices base sprite-vertex
- x1 y1
- r g b a
- u v)
- (pack vertices (+ base 1) sprite-vertex
- x2 y2
- r g b a
- u v2)
- (pack vertices (+ base 2) sprite-vertex
- x3 y3
- r g b a
- u2 v2)
- (pack vertices (+ base 3) sprite-vertex
- x4 y4
- r g b a
- u2 v))
+ (pack-sprite-vertices (sprite-batch-vertices batch)
+ (* 4 (sprite-batch-size batch))
+ x y width height origin-x origin-y
+ scale-x scale-y rotation u v u2 v2 color)
+
;; Increment batch size
(set-sprite-batch-size! batch (1+ (sprite-batch-size batch))))
generated by cgit v1.2.3 (git 2.25.4) at 2024-11-07 21:19:45 +0000