1 ! Copyright (C) 2005, 2006 Slava Pestov.
2 ! See http://factorcode.org/license.txt for BSD license.
4 USING: alien errors io kernel math namespaces opengl
7 : gl-color ( colorspec -- ) first4 glColor4d ; inline
10 glGetError dup zero? [
11 "GL error: " write dup gluErrorString print flush
14 : do-state ( what quot -- )
15 swap glBegin call glEnd ; inline
17 : do-enabled ( what quot -- )
18 over glEnable swap slip glDisable ; inline
20 : do-matrix ( mode quot -- )
21 swap [ glMatrixMode glPushMatrix call ] keep
22 glMatrixMode glPopMatrix ; inline
24 : top-left drop 0 0 glTexCoord2i 0.0 0.0 glVertex2d ; inline
26 : top-right 1 0 glTexCoord2i first 0.0 glVertex2d ; inline
28 : bottom-left 0 1 glTexCoord2i second 0.0 swap glVertex2d ; inline
30 : gl-vertex first2 glVertex2i ; inline
32 : bottom-right 1 1 glTexCoord2i gl-vertex ; inline
34 : four-sides ( dim -- )
35 dup top-left dup top-right dup bottom-right bottom-left ;
38 GL_LINES [ gl-vertex gl-vertex ] do-state ;
40 : gl-fill-rect ( dim -- )
41 #! Draws a two-dimensional box.
42 GL_QUADS [ four-sides ] do-state ;
45 #! Draws a two-dimensional box.
46 GL_FRONT_AND_BACK GL_LINE glPolygonMode
48 0.5 0.5 0.0 glTranslated { 1 1 } v-
49 GL_QUADS [ dup four-sides top-left ] do-state
51 GL_FRONT_AND_BACK GL_FILL glPolygonMode ;
53 : (gl-poly) [ [ gl-vertex ] each ] do-state ;
55 : gl-fill-poly ( points -- )
56 #! Draw a filled polygon.
57 dup length 2 > GL_POLYGON GL_LINES ? (gl-poly) ;
59 : gl-poly ( points -- )
61 GL_LINE_LOOP (gl-poly) ;
63 : prepare-gradient ( direction dim -- v1 v2 )
66 : gl-gradient ( direction colors dim -- )
67 #! Draws a quad strip.
69 swap >r prepare-gradient r>
70 [ length dup 1- v/n ] keep [
71 >r >r 2dup r> r> gl-color v*n
72 dup gl-vertex v+ gl-vertex
76 : gen-texture ( -- id )
77 #! Generate texture ID.
78 1 0 <uint> [ glGenTextures ] keep *uint ;
80 : save-attribs ( bits quot -- )
81 swap glPushAttrib call glPopAttrib ; inline
83 ! A sprite is a texture and a display list.
84 TUPLE: sprite dlist texture loc dim dim2 ;
86 C: sprite ( loc dim dim2 -- sprite )
87 [ set-sprite-dim2 ] keep
88 [ set-sprite-dim ] keep
89 [ set-sprite-loc ] keep ;
91 : sprite-size2 sprite-dim2 first2 ;
93 : sprite-width sprite-dim first ;
95 : gray-texture ( sprite buffer -- id )
96 #! Given a buffer holding a width x height (powers of two)
97 #! grayscale texture, bind it and return the ID.
100 GL_TEXTURE_2D swap glBindTexture
101 >r >r GL_TEXTURE_2D 0 GL_RGBA r>
102 sprite-size2 0 GL_LUMINANCE_ALPHA
103 GL_UNSIGNED_BYTE r> glTexImage2D
107 : gen-dlist ( -- id )
108 #! Generate display list ID.
111 : make-dlist ( type quot -- id )
112 #! Make a display list.
113 gen-dlist [ rot glNewList call glEndList ] keep ; inline
115 : init-texture ( -- )
116 GL_TEXTURE_2D GL_TEXTURE_MAG_FILTER GL_LINEAR glTexParameteri
117 GL_TEXTURE_2D GL_TEXTURE_MIN_FILTER GL_LINEAR glTexParameteri
118 GL_TEXTURE_2D GL_TEXTURE_WRAP_S GL_CLAMP glTexParameterf
119 GL_TEXTURE_2D GL_TEXTURE_WRAP_T GL_CLAMP glTexParameterf ;
121 : gl-translate ( point -- ) first2 0.0 glTranslated ;
123 : draw-sprite ( sprite -- )
124 dup sprite-loc gl-translate
125 GL_TEXTURE_2D over sprite-texture glBindTexture
127 dup sprite-dim2 gl-fill-rect
128 dup sprite-dim { 1 0 } v*
129 swap sprite-loc v- gl-translate
130 GL_TEXTURE_2D 0 glBindTexture ;
132 : make-sprite-dlist ( sprite -- id )
134 GL_COMPILE [ draw-sprite ] make-dlist
137 : init-sprite ( texture sprite -- )
138 [ set-sprite-texture ] keep
139 [ make-sprite-dlist ] keep set-sprite-dlist ;
141 : free-sprite ( sprite -- )
142 dup sprite-dlist 1 glDeleteLists
143 sprite-texture <uint> 1 swap glDeleteTextures ;
145 : free-sprites ( sprites -- ) [ [ free-sprite ] when* ] each ;