/usr/share/common-lisp/source/mcclim/Backends/OpenGL/opengl-medium.lisp is in cl-mcclim 0.9.6.dfsg.cvs20100315-2.
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;;; (c) copyright 2001 by Julien Boninfante (boninfan@emi.u-bordeaux.fr)
;;; This library is free software; you can redistribute it and/or
;;; modify it under the terms of the GNU Library General Public
;;; License as published by the Free Software Foundation; either
;;; version 2 of the License, or (at your option) any later version.
;;;
;;; This library is distributed in the hope that it will be useful,
;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
;;; Library General Public License for more details.
;;;
;;; You should have received a copy of the GNU Library General Public
;;; License along with this library; if not, write to the
;;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
;;; Boston, MA 02111-1307 USA.
(in-package :CLIM-INTERNALS)
(defclass opengl-medium (basic-medium) ())
;;; The medium transformation is now handled by the
;;; transform-coordinates-mixin in the McCLIM front end. For OpenGL it
;;; might be better to make it part of the model matrix. --moore
#|
(defun medium-transform-position (medium x y)
(declare (type real x y)
(type opengl-medium medium))
(multiple-value-bind (xr yr) (bounding-rectangle*
(sheet-region (medium-sheet medium)))
(declare (type coordinate xr yr))
(transform-position (medium-device-transformation medium)
(- x xr) (- y yr))))
(defun medium-transform-distance (medium dx dy)
(declare (type real dx dy))
(transform-distance (medium-device-transformation medium)
dx dy))
|#
(defmacro with-OpenGL-graphics ((medium) &body body)
`(let ((ink (medium-ink ,medium))
(line-style (medium-line-style ,medium))
;(clipping-region (medium-clipping-region ,medium))
(sheet (medium-sheet ,medium)))
(cond ((eq ink +foreground-ink+) (setf ink (medium-foreground ,medium)))
((eq ink +background-ink+) (setf ink (medium-background ,medium)))
(t nil))
(with-context (sheet)
(multiple-value-bind (red green blue) (color-rgb ink)
(declare (type single-float red green blue))
(gl:glColor3f red green blue))
(gl:glLineWidth (coerce (line-style-thickness line-style) 'single-float))
;(unless (eq clipping-region +everywhere+)
; nil
(gl:glLoadIdentity)
(progn ,@body))))
(defmacro activate-dash ()
(let ((dashes (gensym)))
`(let ((,dashes (line-style-dashes line-style)))
(when ,dashes
(if (eq ,dashes t)
(gl:glLineStipple 1 3)
(gl:glLineStipple 1 3))) ; case of sequence must be implemented
(gl:glEnable gl:GL_LINE_STIPPLE))))
(defmacro desactivate-dash ()
`(gl:glDisable gl:GL_LINE_STIPPLE))
;; Points
(defmacro with-points ((medium) &body body)
`(with-OpenGL-graphics (,medium)
(gl:glPointSize (coerce (line-style-thickness line-style) 'single-float))
(gl:glBegin gl:GL_POINTS)
(progn ,@body)
(gl:glEnd)))
(defmethod medium-draw-point* ((medium opengl-medium) x y)
(declare (type coordinate x y))
(multiple-value-bind (tx ty) (medium-transform-position medium x y)
(declare (type coordinate tx ty))
(with-points (medium)
(gl:glVertex2d tx ty))))
(defmethod medium-draw-points* ((medium opengl-medium) coord-seq)
(declare (type cons coord-seq))
(assert (evenp (length coord-seq)))
(with-points (medium)
(loop for (x y) on coord-seq by #'cddr
do (multiple-value-bind (tx ty) (medium-transform-position medium x y)
(declare (type coordinate x y))
(gl:glVertex2d tx ty)))))
;; Lines
(defmacro with-lines ((medium) &body body)
`(with-OpenGL-graphics (,medium)
(activate-dash)
(gl:glBegin gl:GL_LINES)
(unwind-protect
(progn ,@body))
(gl:glEnd)
(desactivate-dash)))
(defmethod medium-draw-line* ((medium opengl-medium) x1 y1 x2 y2)
(declare (type real x1 y1 x2 y2))
(multiple-value-bind (tx1 ty1) (medium-transform-position medium x1 y1)
(declare (type coordinate tx1 ty1))
(multiple-value-bind (tx2 ty2) (medium-transform-position medium x2 y2)
(declare (type coordinate tx2 ty2))
(with-lines (medium)
(gl:glVertex2d tx1 ty1)
(gl:glVertex2d tx2 ty2)))))
(defmethod medium-draw-lines* ((medium opengl-medium) coord-seq)
(declare (type cons coord-seq))
(assert (evenp (length coord-seq)))
(with-lines (medium)
(loop for (x y) on coord-seq by #'cddr
do (multiple-value-bind (tx ty) (medium-transform-position medium x y)
(declare (type coordinate tx ty))
(gl:glVertex2d tx ty)))))
;; Polygon and Polyline
(defmethod medium-draw-polygon* ((medium opengl-medium) coord-seq closed filled)
(declare (type boolean filled closed)
(type cons coord-seq))
(assert (evenp (length coord-seq)))
(with-OpenGL-graphics (medium)
(if filled
(progn
(gl:glPolygonMode gl:GL_FRONT gl:GL_FILL)
(gl:glBegin gl:GL_POLYGON))
(progn
(activate-dash)
(if closed
(progn
(gl:glPolygonMode gl:GL_FRONT gl:GL_LINE)
(gl:glBegin gl:GL_POLYGON))
(gl:glBegin gl:GL_LINE_STRIP))))
(loop for (x y) on coord-seq by #'cddr
do (multiple-value-bind (tx ty) (medium-transform-position medium x y)
(declare (type coordinate tx ty))
(gl:glVertex2d tx ty)))
(gl:glEnd)
(desactivate-dash)))
;; Rectangle
(defmethod medium-draw-rectangle* ((medium opengl-medium) x1 y1 x2 y2 filled)
(declare (type real x1 y1 x2 y2)
(type boolean filled))
(with-OpenGL-graphics (medium)
(multiple-value-bind (tx1 ty1) (medium-transform-position medium x1 y1)
(declare (type coordinate tx1 ty1))
(multiple-value-bind (tx2 ty2) (medium-transform-position medium x2 y2)
(declare (type coordinate tx2 ty2))
(if filled
(if (rectilinear-transformation-p (medium-transformation medium))
(progn
(when (< tx2 tx1)
(rotatef tx1 tx2))
(when (< ty2 ty1)
(rotatef ty1 ty2))
(gl:glRectd tx1 ty1 tx2 ty2))
(progn
(gl:glBegin gl:GL_QUADS)
(gl:glVertex2d tx1 ty1)
(gl:glVertex2d tx2 ty1)
(gl:glVertex2d tx2 ty2)
(gl:glVertex2d tx1 ty2)
(gl:glEnd)))
(progn
(activate-dash)
(gl:glBegin gl:GL_LINE_LOOP)
(gl:glVertex2d tx1 ty1)
(gl:glVertex2d tx2 ty1)
(gl:glVertex2d tx2 ty2)
(gl:glVertex2d tx1 ty2)
(gl:glEnd)
(desactivate-dash)))))))
;; Ellipse and Elliptical Arc
; In the ellipse, we find the transformation, tr, which transforms the
; unit circle into the ellipse.
; To draw an ellipse (or part of an ellipse), arc between start-angle
; and end-angle is cut in 100 slices. Then a polygon is drawn with all
; points representing the slices.
(defmethod medium-draw-ellipse* ((medium opengl-medium) center-x center-y
radius-1-dx radius-1-dy radius-2-dx radius-2-dy
start-angle end-angle filled)
(declare (type real center-x center-y
radius-1-dx radius-1-dy radius-2-dx radius-2-dy)
(type real start-angle end-angle)
(type boolean filled))
(with-OpenGL-graphics (medium)
(multiple-value-bind (tx ty)
(medium-transform-position medium center-x center-y)
(declare (type coordinate tx ty))
(multiple-value-bind (dx1 dy1)
(medium-transform-distance medium radius-1-dx radius-1-dy)
(declare (type coordinate dx1 dy1))
(multiple-value-bind (dx2 dy2)
(medium-transform-distance medium radius-2-dx radius-2-dy)
(declare (type coordinate dx2 dy2))
(when (= (* dx1 dy2) (* dy1 dx2)) ; vectors radius-1 and radius-2 are colinear
(error 'ellipse-not-well-defined))
(gl:glTranslated tx ty 0d0)
(let* ((ell (make-ellipse* 0d0 0d0 dx1 dy1 dx2 dy2
:start-angle start-angle
:end-angle end-angle))
(tr (slot-value ell 'tr))
(2pi (* 2 pi))
(d-theta (- end-angle start-angle)))
(if filled
(progn
(gl:glPolygonMode gl:GL_FRONT gl:GL_FILL)
(gl:glBegin gl:GL_POLYGON)
(when (/= (mod d-theta 2pi) 0) ; case of the pie slice
(gl:glVertex2d 0d0 0d0)))
(progn
(activate-dash)
(gl:glBegin gl:GL_LINE_STRIP)))
(loop with step-angle of-type real = (/ (- end-angle start-angle) 100)
for theta from start-angle to end-angle by step-angle
do (multiple-value-bind (x y) (transform-position tr (cos theta) (sin theta))
(declare (type coordinate x y))
(gl:glVertex2d x y)))
(gl:glEnd)
(desactivate-dash)))))))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;
;;; Methods for text styles
(defmethod text-size ((medium opengl-medium) string &key text-style (start 0) end)
(declare (type fixnum start))
(let ((port (port medium)))
(when (characterp string)
(setf string (make-string 1 :initial-element string)))
(unless end (setf end (length string)))
(unless text-style (setf text-style (medium-text-style medium)))
(if (= start end)
(values 0 0 0 0 0)
(let ((position-newline (position #\newline string :start start)))
(if position-newline
; newline inside the string
(multiple-value-bind (width ascent descent left right
font-ascent direction first-not-done)
(port-text-extents port text-style string :start start :end position-newline)
(declare (type real width ascent descent)
(ignorable left right font-ascent direction first-not-done))
(multiple-value-bind (w h x y baseline)
(text-size medium string :text-style text-style
:start (1+ position-newline) :end end)
(values (max w width) (+ ascent descent h)
x (+ ascent descent y) (+ ascent descent baseline))))
; no newline inside the string
(multiple-value-bind (width ascent descent left right
font-ascent direction first-not-done)
(port-text-extents port text-style string
:start start :end end)
(declare (type real width ascent descent)
(ignorable left right font-ascent direction first-not-done))
(values width (+ ascent descent) width 0 ascent)))))))
(defmethod medium-draw-text* ((medium opengl-medium) string x y
start end
align-x align-y
toward-x toward-y transform-glyphs)
(declare (ignore toward-x toward-y transform-glyphs)
(type real x y)
(type fixnum start)
(type symbol align-x align-y))
(multiple-value-bind (text-style-list text-style-start)
(text-style-list-and-start (port medium) (medium-text-style medium))
(declare (type fixnum text-style-list))
(with-OpenGL-graphics (medium)
(when (characterp string)
(setq string (make-string 1 :initial-element string)))
(unless end (setq end (length string)))
(multiple-value-bind (tx ty)
(medium-transform-position medium x y)
(declare (type coordinate tx ty))
(multiple-value-bind (text-width text-height x y baseline)
(text-size medium string :start start :end end)
(declare (type real text-width text-height baseline)
(ignore x y))
(unless (and (eq align-x :left) (eq align-y :baseline))
(setq tx (- tx (ecase align-x
(:left 0)
(:center (round text-width 2))
(:right text-width))))
(setq ty (ecase align-y
(:top (+ ty baseline))
(:center (+ ty baseline (- (floor text-height 2))))
(:baseline ty)
(:bottom (+ ty baseline (- text-height)))))))
(let* ((s (subseq string start end))
(tab (map '(simple-array (unsigned-byte 8) (*))
#'(lambda (char)
(declare (type standard-char char))
(- (char-code char) text-style-start))
s)))
(declare (type string s))
(gl:glRasterPos2d tx ty)
(gl:glListBase text-style-list)
(gl:glCallLists (length s) gl:GL_UNSIGNED_BYTE (find-array-address tab)))))))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;
;;; Methods for text styles
(defmethod text-style-ascent (text-style (medium opengl-medium))
; (let ((font (text-style-to-X-font (port medium) text-style)))
; (xlib-gl:font-ascent font))
; ^--- FIXME - BTS
10)
(defmethod text-style-descent (text-style (medium opengl-medium))
; (let ((font (text-style-to-X-font (port medium) text-style)))
; (xlib-gl:font-descent font))
; ^-- FIXME - BTS
4)
(defmethod text-style-height (text-style (medium opengl-medium))
; (let ((font (text-style-to-X-font (port medium) text-style)))
; (+ (xlib-gl:font-ascent font) (xlib-gl:font-descent font)))
; ^-- FIXME - BTS
14)
(defmethod text-style-character-width (text-style (medium opengl-medium) char)
; (xlib-gl:char-width (text-style-to-X-font (port medium) text-style) (char-code char))
; ^-- FIXME - BTS
8)
(defmethod text-style-width (text-style (medium opengl-medium))
(text-style-character-width text-style medium #\m))
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