(outdated) chicken-glm

This egg only works with Chicken 4 and has not been updated to support Chicken 5. There may be similar functionality in Chicken 5 eggs like gl-math.

Chicken Scheme 4 bindings for GLM. GLM is a matrix and vector math library inspired by GLSL. These bindings are not complete, but should cover the basic matrix and vector needs within the graphics-domain.

This egg embeds the headers files of glm version 0.9.4.6-2 for convenience. In particular, this makes cross-compilation easier.

Quickstart

Install with:

$ chicken-install glm

Then run csi and try this:

#> (use glm)
; loading /usr/local/lib/chicken/6/glm.import.so ...
; loading /usr/local/lib/chicken/6/srfi-4.import.so ...
; loading /usr/local/lib/chicken/6/glm.so ...
#> (vec3 1 2 3)
 #f32(1.0 2.0 3.0)

#> (vec4 4 3 1 0)
 #f32(4.0 3.0 1.0 0.0)

#> (vec3 1 2 3)
 #f32(1.0 2.0 3.0)

;; v+ for vector-vector addition
#> (v+ (vec3 1 2 3) (vec3 10 20 30))
 #f32(11.0 22.0 33.0)

;; m+ for matrix-matrix, matrix-vector or vector-vector addition
#> (m+ (vec3 1 2 3) (vec3 10 20 30))
 #f32(11.0 22.0 33.0)

#> (m* (mat2 2) (vec2 -1 -2))
 #f32(-2.0 -4.0)

#> (inverse (inverse (mat2 4)))
#<mat 2x2:
4.0 0.0 
0.0 4.0 >

;; creating an identity matrix
#> (mat2 1)
#<mat 2x2:
1.0 0.0 
0.0 1.0 >

;; or a bigger one
#> (mat4 1)
#<mat 4x4:
1.0 0.0 0.0 0.0 
0.0 1.0 0.0 0.0 
0.0 0.0 1.0 0.0 
0.0 0.0 0.0 1.0 >

;; most of functions from
;; gtc_matrix_transform are present
#> (scale (mat4 1) (vec3 1 2 3))
#<mat 4x4:
1.0 0.0 0.0 0.0 
0.0 2.0 0.0 0.0 
0.0 0.0 3.0 0.0 
0.0 0.0 0.0 1.0 >

#> (translate (scale (mat4 1) (vec3 1 2 3)) (vec3 10 20 30))
#<mat 4x4:
1.0 0.0 0.0 10.0 
0.0 2.0 0.0 40.0 
0.0 0.0 3.0 90.0 
0.0 0.0 0.0 1.0 >

#> (m* (scale (mat4 1) (vec3 1 2 3)) (vec4 10 20 30 0))
#f32(10.0 40.0 90.0 0.0)

;; all primitives from glm/glsl are supported:
#> (dvec2 1 2)
 #f64(1.0 2.0)
#> (ivec2 1 2)
 #s32(1 2)
#> (bvec2 1 2)
 #u8(1 2)
#> (uvec2 1 2)
 #u32(1 2)

Working with OpenGL, you might do something like shown below. The mat record holds a raw column-major srfi-vector and a slot with the number of columns. Use mat-data to get hold of the raw data (which is what OpenGL wants).

(glUniformMatrix4fv transl 1 GL_FALSE
                      (mat-data (rotate (mat4 1)
                                        some-angle
                                        (vec3 0 0 1))))

TODO

Add column-selectors, eg (mat-col mat3x4 2) => vec4
Better way to hard-code matrices, like (list->mat '((1 0) (0 1))) => mat2
Type-conversions, eg vec4->ivec4, dmat->mat
Dispatchers (like v+) for all operations (eg. we have length/dvec3 but no generic length/vec)
Hide helper-macros like template

Adellica/chicken-glm

(outdated) chicken-glm

Quickstart

TODO