94 lines
2.0 KiB
Go
94 lines
2.0 KiB
Go
package geometry
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import (
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"github.com/go-gl/gl/v4.6-core/gl"
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"github.com/udhos/gwob"
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)
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// attributes:
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// position 3 * float
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// texture 2 * float
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// normal 3 * float
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type Geometry struct {
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vao uint32
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vbo uint32
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ebo uint32
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size int32
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}
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func (g Geometry) Draw() {
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gl.BindVertexArray(g.vao)
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gl.BindBuffer(gl.ARRAY_BUFFER, g.vbo)
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gl.DrawElementsWithOffset(gl.TRIANGLES, g.size, gl.UNSIGNED_INT, 0)
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}
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func (g Geometry) Delete() {
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gl.DeleteVertexArrays(1, &g.vao)
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gl.DeleteBuffers(1, &g.ebo)
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gl.DeleteBuffers(1, &g.vbo)
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}
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func new(coords []float32, indicies []int) (Geometry, error) {
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var geometry Geometry
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unsignedIndicies := make([]uint32, len(indicies))
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for i, v := range indicies {
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unsignedIndicies[i] = uint32(v)
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}
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// vao
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gl.GenVertexArrays(1, &geometry.vao)
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gl.BindVertexArray(geometry.vao)
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// vbo
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gl.GenBuffers(1, &geometry.vbo)
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gl.BindBuffer(gl.ARRAY_BUFFER, geometry.vbo)
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gl.BufferData(gl.ARRAY_BUFFER, len(coords)*4, gl.Ptr(coords), gl.STATIC_DRAW)
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// attributes
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// position
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gl.VertexAttribPointerWithOffset(0, 3, gl.FLOAT, false, 8*4, 0)
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gl.EnableVertexAttribArray(0)
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// texture
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gl.VertexAttribPointerWithOffset(1, 2, gl.FLOAT, false, 8*4, 3*4)
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gl.EnableVertexAttribArray(1)
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// normal
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gl.VertexAttribPointerWithOffset(2, 3, gl.FLOAT, false, 8*4, 5*4)
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gl.EnableVertexAttribArray(2)
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// ebo
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gl.GenBuffers(1, &geometry.ebo)
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gl.BindBuffer(gl.ELEMENT_ARRAY_BUFFER, geometry.ebo)
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gl.BufferData(gl.ELEMENT_ARRAY_BUFFER, len(unsignedIndicies)*4, gl.Ptr(unsignedIndicies), gl.STATIC_DRAW)
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geometry.size = int32(len(indicies))
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return geometry, nil
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}
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func LoadOBJ(path string) (geometries Geometry, err error) {
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o, err := gwob.NewObjFromFile(path, &gwob.ObjParserOptions{})
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if err != nil {
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return geometries, err
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}
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return new(o.Coord, o.Indices)
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}
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func Screen() (Geometry, error) {
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return new(
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[]float32{
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// xyz uv ijk
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-1, -1, 0, 0, 0, 0, 0, 0,
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1, -1, 0, 1, 0, 0, 0, 0,
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-1, 1, 0, 0, 1, 0, 0, 0,
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1, 1, 0, 1, 1, 0, 0, 0,
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},
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[]int{
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0, 1, 2,
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1, 3, 2,
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})
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}
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