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;;; Sly
;;; Copyright (C) 2013, 2014 David Thompson <dthompson2@worcester.edu>
;;;
;;; This program is free software: you can redistribute it and/or
;;; modify it under the terms of the GNU General Public License as
;;; published by the Free Software Foundation, either version 3 of the
;;; License, or (at your option) any later version.
;;;
;;; This program 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
;;; General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with this program. If not, see
;;; <http://www.gnu.org/licenses/>.
;;; Commentary:
;;
;; Custom wrappers over low level OpenGL commands that aren't part of
;; guile-opengl.
;;
;;; Code:
(define-module (sly wrappers gl)
#:use-module (ice-9 match)
#:use-module (srfi srfi-4)
#:use-module ((system foreign) #:select (bytevector->pointer))
#:use-module ((gl low-level) #:renamer (symbol-prefix-proc '%))
#:use-module (gl enums)
#:use-module (gl runtime)
#:use-module (gl types))
(re-export (%glClearColor . gl-clear-color)
(%glScissor . gl-scissor))
;;;
;;; 3.8.1 Texture Image Specification
;;;
(re-export (%glTexImage3D . gl-texture-image-3d)
(%glTexImage2D . gl-texture-image-2d)
(%glTexImage1D . gl-texture-image-1d))
;;;
;;; 3.8.2 Alternate Texture Image Specification Commands
;;;
(re-export (%glCopyTexImage2D . gl-copy-texture-image-2d)
(%glCopyTexImage1D . gl-copy-texture-image-1d)
(%glCopyTexSubImage3D . gl-copy-texture-sub-image-3d)
(%glCopyTexSubImage2D . gl-copy-texture-sub-image-2d)
(%glCopyTexSubImage1D . gl-copy-texture-sub-image-1d)
(%glTexSubImage3D . gl-texture-sub-image-3d)
(%glTexSubImage2D . gl-texture-sub-image-2d)
(%glTexSubImage1D . gl-texture-sub-image-1d))
;;;
;;; 3.8.3 Compressed Texture Images
;;;
(re-export (%glCompressedTexImage1D . gl-compressed-texture-image-1d)
(%glCompressedTexImage2D . gl-compressed-texture-image-2d)
(%glCompressedTexImage3D . gl-compressed-texture-image-3d)
(%glCompressedTexSubImage1D . gl-compressed-texture-sub-image-1d)
(%glCompressedTexSubImage2D . gl-compressed-texture-sub-image-2d)
(%glCompressedTexSubImage3D . gl-compressed-texture-sub-image-3d))
;;;
;;; 3.8.4 Texture Parameters
;;;
(re-export (%glTexParameteri . gl-texture-parameter))
(define gl-current-texture
(let ((binding-map (list (cons (texture-target texture-1d)
(get-p-name texture-binding-1d))
(cons (texture-target texture-2d)
(get-p-name texture-binding-2d))
(cons (texture-target texture-3d-ext)
(get-p-name texture-binding-3d)))))
(lambda (target)
"Return the id of the currently bound texture."
(let ((bv (make-s32vector 1)))
(%glGetIntegerv (assoc-ref binding-map target)
(bytevector->pointer bv))
(s32vector-ref bv 0)))))
;; emacs: (put 'with-gl-bind-texture 'scheme-indent-function 2)
(define-syntax-rule (with-gl-bind-texture target id body ...)
(let ((old-id (gl-current-texture target)))
(if (= id old-id)
(begin body ...)
(begin
(%glBindTexture target id)
body ...
(%glBindTexture target old-id)))))
(export with-gl-bind-texture)
;;;
;;; Instancing extension
;;;
(define-gl-procedure (glDrawArraysInstanced (mode GLenum)
(first GLint)
(count GLsizei)
(primcount GLsizei)
-> GLboolean)
"Draw multiple instances of a set of arrays.")
(define-gl-procedure (glVertexAttribDivisor (index GLuint)
(divisor GLuint)
-> void)
"Modify the rate at which generic vertex attributes advance during
instanced rendering.")
(export glDrawArraysInstanced
glVertexAttribDivisor)
;;;
;;; VAOs
;;;
(define-gl-procedure (glGenVertexArrays (n GLsizei)
(arrays GLuint-*)
-> void)
"Generate N vertex arrays.")
(define-gl-procedure (glDeleteVertexArrays (n GLsizei)
(arrays GLuint-*)
-> void)
"Delete vertex array objects.")
(define-gl-procedure (glBindVertexArray (array GLuint)
-> void)
"Bind vertex array object ARRAY.")
(export glGenVertexArrays
glDeleteVertexArrays
glBindVertexArray)
(define-syntax-rule (with-gl-client-state state body ...)
(begin
(gl-enable-client-state state)
body ...
(gl-disable-client-state state)))
(export with-gl-client-state)
;;;
;;; Framebuffers
;;;
(define-gl-procedure (glGenFramebuffers (n GLsizei)
(ids GLuint-*)
-> void)
"Generate framebuffer object names.")
(define-gl-procedure (glDeleteFramebuffers (n GLsizei)
(framebuffers GLuint-*)
-> void)
"Delete framebuffer objects.")
(define-gl-procedure (glBindFramebuffer (target GLenum)
(framebuffer GLuint)
-> void)
"Bind a framebuffer to a framebuffer target.")
(define-gl-procedure (glFramebufferTexture2D (target GLenum)
(attachment GLenum)
(textarget GLenum)
(texture GLuint)
(level GLint)
-> void)
"Attach a level of a texture object as a logical buffer to the
currently bound framebuffer object.")
(define-gl-procedure (glCheckFramebufferStatus (target GLenum)
-> GLenum)
"Return the framebuffer completeness status of a framebuffer
object.")
(define-gl-procedure (glGenRenderbuffers (n GLsizei)
(ids GLuint-*)
-> void)
"Generate renderbuffer object names.")
(define-gl-procedure (glDeleteRenderbuffers (n GLsizei)
(renderbuffers GLuint-*)
-> void)
"Delete renderbuffer objects.")
(define-gl-procedure (glBindRenderbuffer (target GLenum)
(renderbuffer GLuint)
-> void)
"Bind a named renderbuffer object.")
(define-gl-procedure (glRenderbufferStorage (target GLenum)
(internalformat GLenum)
(width GLsizei)
(height GLsizei)
-> void)
"Create and initialize a renderbuffer object's data store.")
(define-gl-procedure (glFramebufferRenderbuffer (target GLenum)
(attachment GLenum)
(renderbuffertarget GLenum)
(renderbuffer GLuint)
-> void)
"Attach a renderbuffer object to a framebuffer object.")
(export glGenFramebuffers
glDeleteFramebuffers
glBindFramebuffer
glFramebufferTexture2D
glCheckFramebufferStatus
glGenRenderbuffers
glDeleteRenderbuffers
glBindRenderbuffer
glRenderbufferStorage
glFramebufferRenderbuffer)
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