Moved all into one package, added png loader.

fbo.go

@@ -0,0 +1,123 @@
+package goga
+
+import (
+	"github.com/go-gl/gl/v4.5-core/gl"
+)
+
+// Frame Buffer Object.
+type FBO struct {
+	id          uint32
+	target      uint32
+	attachments []uint32
+}
+
+// Creates a new FBO with given target.
+func NewFBO(target uint32) *FBO {
+	fbo := &FBO{}
+	gl.GenFramebuffers(1, &fbo.id)
+	fbo.target = target
+	fbo.attachments = make([]uint32, 0)
+
+	return fbo
+}
+
+// Creates a new FBO with given target and 2D texture.
+// Used to render to texture.
+func NewFBOWithTex2D(width, height, filter int32) (*FBO, *Tex) {
+	tex := NewTex(gl.TEXTURE_2D)
+	tex.Bind()
+	tex.SetDefaultParams(filter)
+	tex.Texture2D(0,
+		gl.RGBA,
+		width,
+		height,
+		gl.RGBA,
+		gl.UNSIGNED_BYTE,
+		nil)
+	tex.Unbind()
+
+	fbo := NewFBO(gl.FRAMEBUFFER)
+	fbo.Bind()
+	fbo.Texture2D(gl.COLOR_ATTACHMENT0, tex.GetId(), 0)
+	fbo.Unbind()
+
+	return fbo, tex
+}
+
+// Drops the FBO.
+func (f *FBO) Drop() {
+	gl.DeleteFramebuffers(1, &f.id)
+}
+
+// Binds the FBO for usage (rendered on).
+func (f *FBO) Bind() {
+	gl.BindFramebuffer(f.target, f.id)
+}
+
+// Unbinds.
+func (f *FBO) Unbind() {
+	gl.BindFramebuffer(f.target, 0)
+}
+
+// Sets draw buffer.
+func (f *FBO) DrawBuffer(mode uint32) {
+	gl.DrawBuffer(mode)
+}
+
+// Sets read buffer.
+func (f *FBO) ReadBuffer(mode uint32) {
+	gl.ReadBuffer(mode)
+}
+
+func (f *FBO) DrawBuffers(mode uint32) {
+	gl.DrawBuffers(int32(len(f.attachments)), &f.attachments[0])
+}
+
+// Removes all attached textures from FBO.
+func (f *FBO) ClearAttachments() {
+	f.attachments = make([]uint32, 0)
+}
+
+// Attaches a texture.
+func (f *FBO) Texture(attachment, texId uint32, level int32) {
+	f.attachments = append(f.attachments, attachment)
+	gl.FramebufferTexture(f.target, attachment, texId, level)
+}
+
+// Attaches a 1D texture.
+func (f *FBO) Texture1D(attachment, texId uint32, level int32) {
+	f.attachments = append(f.attachments, attachment)
+	gl.FramebufferTexture1D(f.target, attachment, gl.TEXTURE_1D, texId, level)
+}
+
+// Attaches a 2D texture.
+func (f *FBO) Texture2D(attachment, texId uint32, level int32) {
+	f.attachments = append(f.attachments, attachment)
+	gl.FramebufferTexture2D(f.target, attachment, gl.TEXTURE_2D, texId, level)
+}
+
+// Attaches a 3D texture.
+func (f *FBO) Texture3D(attachment, texId uint32, level, layer int32) {
+	f.attachments = append(f.attachments, attachment)
+	gl.FramebufferTexture3D(f.target, attachment, gl.TEXTURE_3D, texId, level, layer)
+}
+
+// Returns the status of the FBO.
+func (f *FBO) GetStatus() uint32 {
+	return gl.CheckFramebufferStatus(f.target)
+}
+
+// Returns true if FBO is complete, else false.
+func (f *FBO) Complete() bool {
+	return f.GetStatus() == gl.FRAMEBUFFER_COMPLETE
+}
+
+// Returns the GL ID.
+func (f *FBO) GetId() uint32 {
+	return f.id
+}
+
+// Returns the target.
+func (f *FBO) GetTarget() uint32 {
+	return f.target
+}