func (glRenderer *OpenglRenderer) mainLoop() {
glRenderer.onUpdate()
glRenderer.updateLights()
//set defaults
glRenderer.UseRendererParams(renderer.DefaultRendererParams())
glRenderer.UseMaterial(nil)
if len(glRenderer.postEffects) == 0 {
gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)
glRenderer.onRender()
} else {
//Render to the first post effect buffer
gl.BindFramebuffer(gl.FRAMEBUFFER, glRenderer.postEffects[0].fboId)
gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)
glRenderer.onRender()
//Render Post effects
for i := 0; i < len(glRenderer.postEffects)-1; i = i + 1 {
gl.BindFramebuffer(gl.FRAMEBUFFER, glRenderer.postEffects[i+1].fboId)
gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)
glRenderer.renderPostEffect(glRenderer.postEffects[i])
}
//Render final post effect to the frame buffer
gl.BindFramebuffer(gl.FRAMEBUFFER, 0)
gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)
glRenderer.renderPostEffect(glRenderer.postEffects[len(glRenderer.postEffects)-1])
}
}
func (f *FrameBuffer) Unbind() {
// finish drawing
gl.Flush()
// unbind
gl.BindFramebuffer(gl.FRAMEBUFFER, 0)
}
func (f *FrameBuffer) Bind() {
gl.BindTexture(gl.TEXTURE_2D, 0) // why?
// bind this frame buffer
gl.BindFramebuffer(gl.FRAMEBUFFER, f.id)
// set viewport size equal to buffer size
gl.Viewport(0, 0, f.Width, f.Height)
}
func CreateFrameBuffer(width, height int32) *FrameBuffer {
f := &FrameBuffer {
Width: width,
Height: height,
Buffers: []DrawBuffer { },
ClearColor: Color4(0,0,0,1),
}
gl.GenFramebuffers(1, &f.id)
gl.BindFramebuffer(gl.FRAMEBUFFER, f.id)
return f
}
func (glRenderer *OpenglRenderer) CreatePostEffect(shader *renderer.Shader) {
//Create program
glRenderer.CreateShader(shader)
gl.UseProgram(shader.Program)
//Create Texture
var fbo_texture uint32
gl.ActiveTexture(gl.TEXTURE0)
gl.GenTextures(1, &fbo_texture)
gl.BindTexture(gl.TEXTURE_2D, fbo_texture)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE)
gl.TexImage2D(gl.TEXTURE_2D, 0, gl.RGBA, int32(glRenderer.WindowWidth), int32(glRenderer.WindowHeight), 0, gl.RGBA, gl.UNSIGNED_BYTE, nil)
//Create depth buffer
var dbo uint32
gl.GenRenderbuffers(1, &dbo)
gl.BindRenderbuffer(gl.RENDERBUFFER, dbo)
gl.RenderbufferStorage(gl.RENDERBUFFER, gl.DEPTH_COMPONENT16, int32(glRenderer.WindowWidth), int32(glRenderer.WindowHeight))
gl.BindRenderbuffer(gl.RENDERBUFFER, 0)
//Create frame buffer
var fbo uint32
gl.GenFramebuffers(1, &fbo)
gl.BindFramebuffer(gl.FRAMEBUFFER, fbo)
gl.FramebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, fbo_texture, 0)
gl.FramebufferRenderbuffer(gl.FRAMEBUFFER, gl.DEPTH_ATTACHMENT, gl.RENDERBUFFER, dbo)
//add new postEffect to the queue
newPe := postEffect{
program: shader.Program,
textureId: fbo_texture,
dboId: dbo,
fboId: fbo,
shader: shader,
}
glRenderer.postEffects = append(glRenderer.postEffects, newPe)
}