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be421aed AW |
1 | ;;; figl |
2 | ;;; Copyright (C) 2013 Andy Wingo <wingo@pobox.com> | |
1547f980 | 3 | ;;; Copyright (C) 2013 Daniel Hartwig <mandyke@gmail.com> |
be421aed AW |
4 | ;;; |
5 | ;;; Figl is free software: you can redistribute it and/or modify it | |
6 | ;;; under the terms of the GNU Lesser General Public License as | |
7 | ;;; published by the Free Software Foundation, either version 3 of the | |
8 | ;;; License, or (at your option) any later version. | |
9 | ;;; | |
10 | ;;; Figl is distributed in the hope that it will be useful, but WITHOUT | |
11 | ;;; ANY WARRANTY; without even the implied warranty of MERCHANTABILITY | |
12 | ;;; or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General | |
13 | ;;; Public License for more details. | |
14 | ;;; | |
15 | ;;; You should have received a copy of the GNU Lesser General Public | |
16 | ;;; License along with this program. If not, see | |
17 | ;;; <http://www.gnu.org/licenses/>. | |
18 | ||
19 | ;;; Commentary: | |
20 | ;; | |
21 | ;; OpenGL binding. | |
22 | ;; | |
23 | ;;; Code: | |
24 | ||
25 | (define-module (figl gl) | |
26 | #:use-module (figl runtime) | |
ea80f801 | 27 | #:use-module (figl gl types) |
1547f980 | 28 | #:use-module (figl gl enums) |
ea80f801 DH |
29 | #:use-module ((figl gl low-level) #:renamer (symbol-prefix-proc '%)) |
30 | #:use-module (system foreign)) | |
be421aed | 31 | |
1547f980 DH |
32 | ;; Notice there is no #:export clause. Exports are done inline to |
33 | ;; facilitate re-exporting low-level bindings (and changing that | |
34 | ;; choice), and identifying gaps in the API. | |
35 | ;; | |
36 | ;; There are two sets of exports for each section. The first is for | |
37 | ;; bindings defined in the specification, exported in order. The | |
38 | ;; second is for additional procedures not defined by the spec. but | |
39 | ;; relevant to the section, for example with-gl-begin. | |
40 | ;; | |
41 | ;; At least keep this format until the bindings are fairly complete. | |
42 | ||
43 | (module-use! (module-public-interface (current-module)) | |
44 | (resolve-interface '(figl gl enums))) | |
45 | ||
46 | ;;; | |
47 | ;;; 2.6 Begin/End Paradigm | |
48 | ;;; | |
49 | ||
fd9caf2f | 50 | ;; emacs: (put 'gl-begin 'scheme-indent-function 1) |
276f55f7 DH |
51 | (define-syntax gl-begin |
52 | (syntax-rules () | |
53 | ((_ mode body1 body2 ...) | |
54 | (call-with-values | |
55 | (lambda () | |
56 | (%glBegin mode) | |
57 | body1 body2 ...) | |
58 | (lambda vals | |
59 | (%glEnd) | |
60 | (apply values vals)))))) | |
61 | ||
1547f980 DH |
62 | (define (gl-edge-flag flag) |
63 | (%glEdgeFlag (if flag (boolean true) (boolean false)))) | |
64 | ||
276f55f7 | 65 | (export-syntax gl-begin) |
1547f980 DH |
66 | |
67 | (export gl-edge-flag) | |
68 | ||
1547f980 DH |
69 | ;;; |
70 | ;;; 2.7 Vertex Specification | |
71 | ;;; | |
72 | ||
73 | ;; Note that these are float variants only. This has implications for | |
74 | ;; some functions whose integer variants normalize their arguments. | |
75 | ;; The corresponding float variants expect normalized input, usually | |
76 | ;; in the range [0, 1]. Refer to the OpenGL specification for | |
77 | ;; details. | |
78 | ;; | |
79 | ;; For access to non-float variants please use the appropriate | |
80 | ;; low-level binding. | |
81 | ||
82 | ;; TODO: Maybe re-export packaged variants here. Unpacked byte | |
83 | ;; variants? | |
84 | ||
85 | (define* (gl-vertex x y #:optional (z 0.0) (w 1.0)) | |
86 | (%glVertex4f x y z w)) | |
87 | ||
ea80f801 | 88 | (define* (gl-texture-coordinate s #:optional (t 0.0) (r 0.0) (q 1.0)) |
1547f980 DH |
89 | (%glTexCoord4f s t r q)) |
90 | ||
ea80f801 | 91 | (define* (gl-multi-texture-coordinate texture s #:optional (t 0.0) (r 0.0) (q 1.0)) |
1547f980 DH |
92 | (%glMultiTexCoord4f texture s t r q)) |
93 | ||
94 | (define* (gl-color red green blue #:optional (alpha 1.0)) | |
95 | (%glColor4f red green blue alpha)) | |
96 | ||
ea80f801 | 97 | (define* (gl-vertex-attribute index x #:optional (y 0.0) (z 0.0) (w 1.0)) |
1547f980 DH |
98 | (%glVertexAttrib4f index x y z w)) |
99 | ||
100 | (export gl-vertex | |
ea80f801 DH |
101 | gl-texture-coordinate |
102 | gl-multi-texture-coordinate | |
103 | gl-color | |
104 | gl-vertex-attribute) | |
1547f980 | 105 | |
8c6d5fbb | 106 | (re-export (%glNormal3f . gl-normal) |
ea80f801 | 107 | (%glFogCoordf . gl-fog-coordinate) |
8c6d5fbb DH |
108 | (%glSecondaryColor3f . gl-secondary-color) |
109 | (%glIndexi . gl-index)) | |
1547f980 DH |
110 | |
111 | ;;; | |
112 | ;;; 2.10 Rectangles | |
113 | ;;; | |
114 | ||
8c6d5fbb | 115 | (re-export (%glRectf . gl-rectangle)) |
96e10a21 DH |
116 | |
117 | \f | |
118 | ;;; | |
119 | ;;; 2.11 Coordinate Transformation | |
120 | ;;; | |
121 | ||
122 | ;;; | |
123 | ;;; 2.11.1 Controlling the Viewport | |
124 | ;;; | |
125 | ||
8c6d5fbb DH |
126 | (re-export (%glDepthRange . gl-depth-range) |
127 | (%glViewport . gl-viewport)) | |
96e10a21 DH |
128 | |
129 | ;;; | |
130 | ;;; 2.11.2 Matrices | |
131 | ;;; | |
132 | ||
133 | ;; OpengGL matrices are stored in column-major order. This is | |
134 | ;; different to the usual row-major order used in 2-dimensional | |
135 | ;; arrays, which will have to be transposed as they loaded. | |
136 | ||
137 | (define* (gl-load-matrix m #:key (transpose #f)) | |
138 | ((if transpose | |
139 | %glLoadTransposeMatrixf | |
140 | %glLoadMatrixf) | |
141 | (array-contents m))) | |
142 | ||
143 | (define* (gl-multiply-matrix m #:key (transpose #f)) | |
144 | ((if transpose | |
145 | %glMultTransposeMatrixf | |
146 | %glMultMatrixf) | |
147 | (array-contents m))) | |
148 | ||
149 | (export gl-load-matrix | |
150 | gl-multiply-matrix) | |
151 | ||
fd9caf2f | 152 | (re-export (%glMatrixMode . set-gl-matrix-mode) |
8c6d5fbb DH |
153 | (%glLoadIdentity . gl-load-identity) |
154 | (%glRotatef . gl-rotate) | |
155 | (%glTranslatef . gl-translate) | |
156 | (%glScalef . gl-scale) | |
157 | (%glFrustum . gl-frustum) | |
158 | (%glOrtho . gl-ortho) | |
bfac2618 | 159 | (%glActiveTexture . set-gl-active-texture)) |
96e10a21 | 160 | |
fd9caf2f | 161 | ;; emacs: (put 'with-gl-push-matrix 'scheme-indent-function 0) |
96e10a21 DH |
162 | (define-syntax with-gl-push-matrix |
163 | (syntax-rules () | |
164 | ((_ body ...) | |
165 | (begin | |
166 | (%glPushMatrix) | |
167 | body ... | |
168 | (%glPopMatrix))))) | |
169 | ||
170 | (export-syntax with-gl-push-matrix) | |
171 | ||
172 | ;;; | |
173 | ;;; 2.11.3 Normal Transformations | |
174 | ;;; | |
175 | ||
8c6d5fbb DH |
176 | (re-export (%glEnable . gl-enable) |
177 | (%glDisable . gl-disable)) | |
ea80f801 | 178 | |
fd9caf2f AW |
179 | ;;; |
180 | ;;; 2.14 Colors and Coloring | |
181 | ;;; | |
182 | ||
183 | (re-export (%glShadeModel . set-gl-shade-model)) | |
184 | ||
ea80f801 DH |
185 | \f |
186 | ;;; | |
187 | ;;; 4.1 Per-Fragment Operations | |
188 | ;;; | |
189 | ||
190 | (define* (set-gl-stencil-function stencil-function k #:key | |
191 | (mask #xFFFFFFFF) ; 32-bit mask | |
192 | face) | |
193 | (if face | |
194 | (%glStencilFuncSeparate face stencil-function k mask) | |
195 | (%glStencilFunc stencil-function k mask))) | |
196 | ||
197 | (define* (set-gl-stencil-operation stencil-fail depth-fail depth-pass #:key | |
198 | face) | |
199 | (if face | |
200 | (%glStencilOpSeparate face stencil-fail depth-fail depth-pass) | |
201 | (%glStencilOp stencil-fail depth-fail depth-pass))) | |
202 | ||
203 | ;; TODO: 4.1.7 Occlusion Queries | |
204 | ||
205 | (define* (set-gl-blend-equation mode-rgb #:optional (mode-alpha mode-rgb)) | |
206 | (%glBlendEquationSeparate mode-rgb mode-alpha)) | |
207 | ||
208 | (define* (set-gl-blend-function src-rgb dest-rgb #:optional | |
209 | (src-alpha src-rgb) | |
210 | (dest-alpha dest-rgb)) | |
211 | (%glBlendFuncSeparate src-rgb dest-rgb src-alpha dest-alpha)) | |
212 | ||
213 | (export set-gl-stencil-function | |
214 | set-gl-stencil-operation | |
215 | set-gl-blend-equation | |
216 | set-gl-blend-function | |
217 | ) | |
218 | ||
219 | (re-export (%glScissor . set-gl-scissor) | |
220 | (%glSampleCoverage . set-gl-sample-coverage) | |
221 | (%glAlphaFunc . set-gl-alpha-function) | |
222 | (%glDepthFunc . set-gl-depth-function) | |
223 | (%glBlendColor . set-gl-blend-color) | |
224 | (%glLogicOp . set-gl-logic-operation) | |
225 | ) | |
226 | ||
227 | ;;; | |
228 | ;;; 4.2 Whole Framebuffer Operations | |
229 | ;;; | |
230 | ||
231 | (define (set-gl-draw-buffers buffers) | |
232 | (let* ((n (length buffers)) | |
233 | (buffers (make-c-struct (make-list n (GLenum)) | |
234 | buffers))) | |
235 | (%glDrawBuffers n buffers))) | |
236 | ||
237 | (define* (set-gl-stencil-mask mask #:key face) | |
238 | (if face | |
239 | (%glStencilMaskSeparate face mask) | |
240 | (%glStencilMask mask))) | |
241 | ||
242 | (export set-gl-draw-buffers | |
243 | set-gl-stencil-mask) | |
244 | ||
245 | (re-export (%glDrawBuffer . set-gl-draw-buffer) | |
246 | (%glIndexMask . set-gl-index-mask) | |
247 | (%glColorMask . set-gl-color-mask) | |
248 | (%glDepthMask . set-gl-depth-mask) | |
249 | (%glClear . gl-clear) | |
250 | (%glClearColor . set-gl-clear-color) | |
251 | (%glClearIndex . set-gl-clear-index) | |
252 | (%glClearDepth . set-gl-clear-depth) | |
253 | (%glClearStencil . set-gl-clear-stencil-value) | |
254 | (%glClearAccum . set-gl-clear-accumulation-color) | |
255 | (%glAccum . set-gl-accumulation-buffer-operation)) | |
256 | ||
257 | ;;; | |
258 | ;;; 4.3 Drawing, Reading, and Copying Pixels | |
259 | ;;; | |
260 | ||
261 | ;; TODO: read-pixels | |
262 | ||
263 | (re-export (%glReadBuffer . set-gl-read-buffer) | |
264 | (%glCopyPixels . gl-copy-pixels)) | |
fd9caf2f AW |
265 | |
266 | ;;; | |
267 | ;;; 6.1 Querying GL State | |
268 | ;;; | |
269 | ||
270 | ;; emacs: (put 'with-gl-push-attrib 'scheme-indent-function 1) | |
271 | (define-syntax-rule (with-gl-push-attrib bits body ...) | |
272 | (begin | |
273 | (%glPushAttrib bits) | |
274 | body | |
275 | ... | |
276 | (%glPopAttrib))) | |
277 | ||
278 | (export with-gl-push-attrib) |