110 lines
3.9 KiB
Go
110 lines
3.9 KiB
Go
package gbuffer
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import (
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"errors"
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"github.com/go-gl/gl/v4.6-core/gl"
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)
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type GBuffer struct {
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framebuffer uint32
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depth uint32
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colorAttachments [4]uint32 // albedo, normal, material, position
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}
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var attachments = []uint32{
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gl.COLOR_ATTACHMENT0,
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gl.COLOR_ATTACHMENT1,
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gl.COLOR_ATTACHMENT2,
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gl.COLOR_ATTACHMENT3,
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}
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func (b *GBuffer) Bind() {
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gl.BindFramebuffer(gl.FRAMEBUFFER, b.framebuffer)
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gl.DrawBuffers(int32(len(b.colorAttachments)), &attachments[0])
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}
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func (b *GBuffer) BindTextures() {
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gl.ActiveTexture(gl.TEXTURE0)
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gl.BindTexture(gl.TEXTURE_2D, b.colorAttachments[0])
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gl.ActiveTexture(gl.TEXTURE1)
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gl.BindTexture(gl.TEXTURE_2D, b.depth)
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gl.ActiveTexture(gl.TEXTURE2)
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gl.BindTexture(gl.TEXTURE_2D, b.colorAttachments[1])
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gl.ActiveTexture(gl.TEXTURE3)
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gl.BindTexture(gl.TEXTURE_2D, b.colorAttachments[2])
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gl.ActiveTexture(gl.TEXTURE4)
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gl.BindTexture(gl.TEXTURE_2D, b.colorAttachments[3])
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}
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func (b *GBuffer) Delete() {
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gl.DeleteFramebuffers(1, &b.framebuffer)
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for i, _ := range b.colorAttachments {
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gl.DeleteTextures(1, &b.colorAttachments[i])
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}
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gl.DeleteTextures(1, &b.depth)
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}
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func New(width int, height int) (buffer GBuffer, _ error) {
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gl.GenFramebuffers(1, &buffer.framebuffer)
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gl.BindFramebuffer(gl.FRAMEBUFFER, buffer.framebuffer)
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// albedo
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gl.GenTextures(1, &buffer.colorAttachments[0])
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gl.BindTexture(gl.TEXTURE_2D, buffer.colorAttachments[0])
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gl.TexImage2D(gl.TEXTURE_2D, 0, gl.RGB, int32(width), int32(height), 0, gl.RGB, gl.UNSIGNED_BYTE, nil)
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gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR)
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gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR)
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gl.BindTexture(gl.TEXTURE_2D, 0)
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gl.FramebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, buffer.colorAttachments[0], 0)
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// depth
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gl.GenTextures(1, &buffer.depth)
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gl.BindTexture(gl.TEXTURE_2D, buffer.depth)
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gl.TexImage2D(gl.TEXTURE_2D, 0, gl.DEPTH_COMPONENT, int32(width), int32(height), 0, gl.DEPTH_COMPONENT, gl.FLOAT, nil)
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gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR)
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gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR)
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gl.BindTexture(gl.TEXTURE_2D, 0)
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gl.FramebufferTexture2D(gl.FRAMEBUFFER, gl.DEPTH_ATTACHMENT, gl.TEXTURE_2D, buffer.depth, 0)
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// normal
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gl.GenTextures(1, &buffer.colorAttachments[1])
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gl.BindTexture(gl.TEXTURE_2D, buffer.colorAttachments[1])
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gl.TexImage2D(gl.TEXTURE_2D, 0, gl.RGB, int32(width), int32(height), 0, gl.RGB, gl.UNSIGNED_BYTE, nil)
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gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR)
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gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR)
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gl.BindTexture(gl.TEXTURE_2D, 0)
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gl.FramebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT1, gl.TEXTURE_2D, buffer.colorAttachments[1], 0)
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// material
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gl.GenTextures(1, &buffer.colorAttachments[2])
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gl.BindTexture(gl.TEXTURE_2D, buffer.colorAttachments[2])
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gl.TexImage2D(gl.TEXTURE_2D, 0, gl.RGB, int32(width), int32(height), 0, gl.RGB, gl.UNSIGNED_BYTE, nil)
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gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR)
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gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR)
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gl.BindTexture(gl.TEXTURE_2D, 0)
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gl.FramebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT2, gl.TEXTURE_2D, buffer.colorAttachments[2], 0)
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// position
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gl.GenTextures(1, &buffer.colorAttachments[3])
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gl.BindTexture(gl.TEXTURE_2D, buffer.colorAttachments[3])
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gl.TexImage2D(gl.TEXTURE_2D, 0, gl.RGB, int32(width), int32(height), 0, gl.RGB, gl.FLOAT, nil)
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gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR)
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gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR)
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gl.BindTexture(gl.TEXTURE_2D, 0)
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gl.FramebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT3, gl.TEXTURE_2D, buffer.colorAttachments[3], 0)
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if gl.CheckFramebufferStatus(gl.FRAMEBUFFER) != gl.FRAMEBUFFER_COMPLETE {
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return buffer, errors.New("failed to create framebuffer")
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}
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gl.BindFramebuffer(gl.FRAMEBUFFER, 0)
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return buffer, nil
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}
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