55 lines
1.2 KiB
Go
55 lines
1.2 KiB
Go
package render
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import (
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"unsafe"
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"github.com/go-gl/gl/all-core/gl"
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)
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var (
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screenQuadVerts = []float32{
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-1, -1,
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0, 0,
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1, -1,
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1, 0,
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1, 1,
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1, 1,
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-1, -1,
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0, 0,
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1, 1,
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1, 1,
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-1, 1,
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0, 1,
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}
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screenQuadVAO uint32
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screenQuadVBO uint32
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)
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func initScreenQuad() {
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gl.GenBuffers(1, &screenQuadVBO)
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gl.BindBuffer(gl.ARRAY_BUFFER, screenQuadVBO)
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gl.BufferData(gl.ARRAY_BUFFER, int(unsafe.Sizeof(float32(0)))*len(screenQuadVerts), gl.Ptr(screenQuadVerts), gl.STATIC_DRAW)
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gl.GenVertexArrays(1, &screenQuadVAO)
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gl.BindVertexArray(screenQuadVAO)
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gl.VertexAttribPointer(0, 2, gl.FLOAT, false, int32(4*unsafe.Sizeof(float32(0))), gl.PtrOffset(0))
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gl.VertexAttribPointer(1, 2, gl.FLOAT, false, int32(4*unsafe.Sizeof(float32(0))), gl.PtrOffset(int(2*unsafe.Sizeof(float32(0)))))
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gl.EnableVertexAttribArray(0)
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gl.EnableVertexAttribArray(1)
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}
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// drawScreenQuad draws a Quad covering the entire screen.
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//
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// Attribute: vert: [ -1.0 --> 1.0]
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func (r *WorldRenderer) drawScreenQuad() {
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if screenQuadVAO == 0 {
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initScreenQuad()
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}
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gl.Disable(gl.DEPTH_TEST)
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gl.Disable(gl.CULL_FACE)
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gl.BindVertexArray(screenQuadVAO)
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gl.DrawArrays(gl.TRIANGLES, 0, 6)
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}
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