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Rendering now works! Added shaders for reference.

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This commit is contained in:
Marvin Blum
2016-05-06 16:53:27 +02:00
parent b0d1f24e3d
commit 3a5b66a20c
13 changed files with 508 additions and 40 deletions
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69
gl_util.go
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@@ -13,3 +13,72 @@ func CheckGLError() {
log.Print(error)
}
}
// Creates three VBOs for a 2D rectangle.
func CreateRectMesh(flip bool) (*VBO, *VBO, *VBO) {
ib, vb, tb := createIndexVertexTexCoordBuffer()
indexData := []uint32{0, 1, 2, 1, 2, 3}
vertexData := []float32{0, 0, 1, 0, 0, 1, 1, 1}
texData := make([]float32, 8)
if flip {
texData = []float32{0, 0, 1, 0, 0, 1, 1, 1}
} else {
texData = []float32{0, 1, 1, 1, 0, 0, 1, 0}
}
ib.Fill(gl.Ptr(indexData), 4, 6, gl.STATIC_DRAW)
vb.Fill(gl.Ptr(vertexData), 4, 8, gl.STATIC_DRAW)
tb.Fill(gl.Ptr(texData), 4, 8, gl.STATIC_DRAW)
return ib, vb, tb
}
// Creates three VBOs for a 3D cube mesh.
// Texture coordinates won't map properly.
// This function is supposed to be used for 3D testing.
func CreateCubeMesh() (*VBO, *VBO, *VBO) {
ib, vb, tb := createIndexVertexTexCoordBuffer()
indexData := []uint32{3, 1, 0,
0, 2, 3,
7, 5, 1,
1, 3, 7,
6, 4, 5,
5, 7, 6,
2, 0, 4,
4, 6, 2,
7, 3, 2,
2, 6, 7,
1, 5, 4,
4, 0, 1}
vertexData := []float32{0, 0, 0,
1, 0, 0,
0, 1, 0,
1, 1, 0,
0, 0, 1,
1, 0, 1,
0, 1, 1,
1, 1, 1}
texData := []float32{0, 0,
1, 0,
0, 1,
1, 1,
1, 1,
0, 1,
1, 0,
0, 0}
ib.Fill(gl.Ptr(indexData), 4, 36, gl.STATIC_DRAW)
vb.Fill(gl.Ptr(vertexData), 4, 24, gl.STATIC_DRAW)
tb.Fill(gl.Ptr(texData), 4, 12, gl.STATIC_DRAW)
return ib, vb, tb
}
func createIndexVertexTexCoordBuffer() (*VBO, *VBO, *VBO) {
return NewVBO(gl.ELEMENT_ARRAY_BUFFER),
NewVBO(gl.ARRAY_BUFFER),
NewVBO(gl.ARRAY_BUFFER)
}