func (r *EffectsRenderer) initFramebuffer(w, h int) (fb uint32, tex uint32, err error) {
gl.GenFramebuffers(1, &fb)
gl.BindFramebuffer(gl.FRAMEBUFFER, fb)
gl.GenTextures(1, &tex)
gl.BindTexture(gl.TEXTURE_2D, tex)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST)
gl.TexImage2D(gl.TEXTURE_2D, 0, gl.RGBA, int32(w), int32(h), 0, gl.RGBA, gl.UNSIGNED_BYTE, nil)
gl.FramebufferTexture2D(gl.DRAW_FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, tex, 0)
if err = r.GetError(); err != nil {
return
}
buffers := []uint32{gl.COLOR_ATTACHMENT0}
gl.DrawBuffers(1, &buffers[0])
var rb uint32
gl.GenRenderbuffers(1, &rb)
gl.BindRenderbuffer(gl.RENDERBUFFER, rb)
gl.RenderbufferStorage(gl.RENDERBUFFER, gl.STENCIL_INDEX8, int32(w), int32(h))
gl.FramebufferRenderbuffer(gl.FRAMEBUFFER, gl.STENCIL_ATTACHMENT, gl.RENDERBUFFER, rb)
gl.BindTexture(gl.TEXTURE_2D, 0)
gl.BindFramebuffer(gl.FRAMEBUFFER, 0)
gl.BindRenderbuffer(gl.RENDERBUFFER, 0)
return
}
func (r *GlowRenderer) Draw() (err error) {
gl.UseProgram(r.shader)
gl.Uniform1i(r.textureUnitLoc, 0)
gl.BindBuffer(gl.ARRAY_BUFFER, r.coords)
gl.EnableVertexAttribArray(r.positionLoc)
gl.VertexAttribPointer(r.positionLoc, 3, gl.FLOAT, false, 5*4, gl.PtrOffset(0))
gl.EnableVertexAttribArray(r.textureLoc)
gl.VertexAttribPointer(r.textureLoc, 2, gl.FLOAT, false, 5*4, gl.PtrOffset(3*4))
gl.Uniform1i(r.blurAmountLoc, int32(r.blur))
gl.Uniform1f(r.blurScaleLoc, r.scale)
gl.Uniform1f(r.blurStrengthLoc, r.strength)
gl.Uniform2f(r.bufferDimensionsLoc, float32(r.width), float32(r.height))
gl.BindFramebuffer(gl.FRAMEBUFFER, r.BlurFb)
gl.Viewport(0, 0, int32(r.width), int32(r.height))
gl.ActiveTexture(gl.TEXTURE0)
gl.BindTexture(gl.TEXTURE_2D, r.GlowTex)
gl.Uniform1i(r.orientationLoc, 0)
gl.DrawArrays(gl.TRIANGLE_STRIP, 0, 4)
gl.BindFramebuffer(gl.FRAMEBUFFER, 0)
gl.Viewport(0, 0, int32(r.oldwidth), int32(r.oldheight))
gl.BlendFunc(gl.ONE, gl.ONE)
gl.BindTexture(gl.TEXTURE_2D, r.BlurTex)
gl.Uniform1i(r.orientationLoc, 1)
gl.DrawArrays(gl.TRIANGLE_STRIP, 0, 4)
gl.BindBuffer(gl.ARRAY_BUFFER, 0)
gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)
return nil
}
//PreRender binds either the next post process fbo if there is one or unbinds any fbo to render to screen. Also disable depth test.
func (ppfb *PostProcessFramebuffer) PreRender() {
if ppfb.next != nil {
ppfb.Fb.Bind(gl2.FRAMEBUFFER)
} else {
gl.BindFramebuffer(gl.FRAMEBUFFER, 0)
}
gl.Disable(gl.DEPTH_TEST)
}
func (r *EffectsRenderer) Delete() error {
gl.BindTexture(gl.TEXTURE_2D, 0)
gl.BindFramebuffer(gl.FRAMEBUFFER, 0)
gl.BindRenderbuffer(gl.RENDERBUFFER, 0)
gl.BindBuffer(gl.ARRAY_BUFFER, 0)
gl.DeleteFramebuffers(1, &r.framebuffer)
gl.DeleteTextures(1, &r.texture)
gl.DeleteBuffers(1, &r.coords)
return r.GetError()
}
func (r *EffectsRenderer) Bind() error {
gl.BindFramebuffer(gl.FRAMEBUFFER, r.framebuffer)
gl.Enable(gl.STENCIL_TEST)
gl.Viewport(0, 0, int32(r.width), int32(r.height))
gl.ClearStencil(0)
gl.ClearColor(0.0, 0.0, 0.0, 0.0)
gl.StencilMask(0xFF) // Write to buffer
gl.Clear(gl.COLOR_BUFFER_BIT | gl.STENCIL_BUFFER_BIT)
gl.StencilMask(0x00) // Don't write to buffer
return nil
}
func (r *GlowRenderer) Delete() error {
gl.BindTexture(gl.TEXTURE_2D, 0)
gl.BindFramebuffer(gl.FRAMEBUFFER, 0)
gl.BindRenderbuffer(gl.RENDERBUFFER, 0)
gl.BindBuffer(gl.ARRAY_BUFFER, 0)
gl.DeleteFramebuffers(1, &r.GlowFb)
gl.DeleteTextures(1, &r.GlowTex)
gl.DeleteFramebuffers(1, &r.BlurFb)
gl.DeleteTextures(1, &r.BlurTex)
gl.DeleteBuffers(1, &r.coords)
return r.GetError()
}
func (r *EffectsRenderer) Draw() (err error) {
gl.UseProgram(r.shader)
gl.Uniform1i(r.textureUnitLoc, 0)
gl.Uniform3f(r.colorLoc, r.Color[0], r.Color[1], r.Color[2])
gl.BindBuffer(gl.ARRAY_BUFFER, r.coords)
gl.EnableVertexAttribArray(r.positionLoc)
gl.VertexAttribPointer(r.positionLoc, 3, gl.FLOAT, false, 5*4, gl.PtrOffset(0))
gl.EnableVertexAttribArray(r.textureLoc)
gl.VertexAttribPointer(r.textureLoc, 2, gl.FLOAT, false, 5*4, gl.PtrOffset(3*4))
gl.BindFramebuffer(gl.FRAMEBUFFER, 0)
gl.Viewport(0, 0, int32(r.oldwidth), int32(r.oldheight))
gl.BlendFunc(gl.ONE, gl.ONE)
gl.BindTexture(gl.TEXTURE_2D, r.texture)
gl.DrawArrays(gl.TRIANGLE_STRIP, 0, 4)
gl.BindBuffer(gl.ARRAY_BUFFER, 0)
gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)
return nil
}
func (r *EffectsRenderer) Unbind() error {
gl.Viewport(0, 0, int32(r.oldwidth), int32(r.oldheight))
gl.BindFramebuffer(gl.FRAMEBUFFER, 0)
gl.Disable(gl.STENCIL_TEST)
return nil
}