51 lines
1.3 KiB
Factor
51 lines
1.3 KiB
Factor
! (c)2009 Joe Groff bsd license
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USING: accessors arrays destructors kernel math opengl
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opengl.gl sequences sequences.product specialized-arrays ;
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FROM: alien.c-types => float ;
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SPECIALIZED-ARRAY: float
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IN: grid-meshes
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TUPLE: grid-mesh dim buffer row-length ;
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<PRIVATE
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: vertex-array-vertex ( dim x z -- vertex )
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[ swap first /f ]
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[ swap second /f ] bi-curry* bi
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[ 0 ] dip float-array{ } 3sequence ;
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: vertex-array-row ( dim z -- vertices )
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dup 1 + 2array
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over first 1 + iota
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2array [ first2 swap vertex-array-vertex ] with product-map
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concat ;
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: vertex-array ( dim -- vertices )
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dup second iota
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[ vertex-array-row ] with map concat ;
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: >vertex-buffer ( bytes -- buffer )
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[ GL_ARRAY_BUFFER ] dip GL_STATIC_DRAW <gl-buffer> ;
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: draw-vertex-buffer-row ( grid-mesh i -- )
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swap [ GL_TRIANGLE_STRIP ] 2dip
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row-length>> [ * ] keep
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glDrawArrays ;
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PRIVATE>
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: draw-grid-mesh ( grid-mesh -- )
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GL_ARRAY_BUFFER over buffer>> [
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[ 3 GL_FLOAT 0 f glVertexPointer ] dip
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dup dim>> second iota [ draw-vertex-buffer-row ] with each
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] with-gl-buffer ;
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: <grid-mesh> ( dim -- grid-mesh )
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[ ] [ vertex-array >vertex-buffer ] [ first 1 + 2 * ] tri
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grid-mesh boa ;
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M: grid-mesh dispose
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[ [ delete-gl-buffer ] when* f ] change-buffer
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drop ;
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