func CreateVOB() {
Verticies := [...]gl.Float{-0.8f, -0.8f, 0.0f, 1.0f,
0.0f, 0.8f, 0.0f, 1.0f,
0.8f, -0.8f, 0.0f, 1.0f}
Colours := [...]gl.Float{1.0f, 0.0f, 0.0f, 1.0f,
0.0f, 1.0f, 0.0f, 1.0f,
0.0f, 0.0f, 1.0f, 1.0f}
BufferSize = unsafe.Sizeof(Verticies)
VertexSize = unsafe.Sizeof(Verticies[0])
RgbOffset = unsafe.Sizeof(Verticies[0].XYZW)
gl.GenVertexArrays(1, &VaoId)
gl.BindVertexArray(VaoId)
gl.GenBuffers(1, &VboId)
gl.BindBuffer(gl.ARRAY_BUFFER, VboId)
gl.BufferData(gl.ARRAY_BUFFER, unsafe.Sizeof(Verticies), Verticies, gl.STATIC_DRAW)
gl.VertexAttribPointer(1, 4, gl.Float, gl.FALSE, 0, 0)
gl.EnableVertexAttribArray(1)
if err := gl.GetError(); err != gl.NO_ERROR {
fmt.Println(err, "ERROR: Could not create a VBO")
}
}
func renderToScreen() {
gl.BindFramebuffer(gl.FRAMEBUFFER, 0)
gl.Viewport(0, 0, winWidth, winHeight)
gl.UseProgram(shaderTextureDisplay.glProg)
gl.BindTexture(gl.TEXTURE_2D, rttFrameTex)
gl.Uniform1i(shaderTextureDisplay.unifTex, 0)
gl.BindBuffer(gl.ARRAY_BUFFER, dispVertBuf)
gl.EnableVertexAttribArray(shaderTextureDisplay.attrPos)
gl.VertexAttribPointer(shaderTextureDisplay.attrPos, 3, gl.FLOAT, gl.FALSE, 0, gl.Pointer(nil))
gl.DrawArrays(gl.TRIANGLE_FAN, 0, 4)
gl.DisableVertexAttribArray(shaderTextureDisplay.attrPos)
gl.BindBuffer(gl.ARRAY_BUFFER, 0)
}
func renderToTexture() {
gl.BindFramebuffer(gl.FRAMEBUFFER, rttFrameBuf)
gl.Viewport(0, 0, texSize, texSize)
gl.ClearColor(0.9, 0.6, 0.3, 1)
gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)
gl.UseProgram(shaderTextureCreator.glProg)
gl.BindBuffer(gl.ARRAY_BUFFER, rttVertBuf)
gl.EnableVertexAttribArray(shaderTextureCreator.attrPos)
gl.VertexAttribPointer(shaderTextureCreator.attrPos, 2, gl.FLOAT, gl.FALSE, 0, gl.Pointer(nil))
gl.DrawArrays(gl.TRIANGLE_FAN, 0, 4)
gl.DisableVertexAttribArray(shaderTextureCreator.attrPos)
gl.BindBuffer(gl.ARRAY_BUFFER, 0)
}
func renderToTexture() {
gl.BindFramebuffer(gl.FRAMEBUFFER, rttFrameBuf)
gl.Viewport(0, 0, texWidth, texHeight)
gl.ClearColor(0.1, 0.2, 0.3, 1)
gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)
gl.UseProgram(shaderTextureCreator.glProg)
gl.BindTexture(gl.TEXTURE_3D, volTex)
gl.Uniform1i(shaderTextureCreator.unifTex, 0)
gl.BindBuffer(gl.ARRAY_BUFFER, rttVertBuf)
gl.EnableVertexAttribArray(shaderTextureCreator.attrPos)
gl.VertexAttribPointer(shaderTextureCreator.attrPos, 2, gl.FLOAT, gl.FALSE, 0, gl.Pointer(nil))
gl.DrawArrays(gl.TRIANGLE_FAN, 0, 4)
gl.DisableVertexAttribArray(shaderTextureCreator.attrPos)
gl.BindBuffer(gl.ARRAY_BUFFER, 0)
}
func display() {
gl.ClearColor(0.19, 0.19, 0.21, 0)
gl.ClearDepth(1)
gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)
gl.UseProgram(theProgram)
// Temporarily set the cam t clip
id := gls.Identity()
trans := getLookAtMatrix()
// log.Println(trans)
gls.UniformMatrix4fv(wtcm_unif, 1, false, trans)
gls.UniformMatrix4fv(mtwm_unif, 1, false, id)
// And here we do the actual rendering
// Generate a name for vufferobj and store it
gl.GenBuffers(1, &positionBufferObject)
// Bind it to a target
gl.BindBuffer(gl.ARRAY_BUFFER, positionBufferObject)
// Conver all nodes to a long array of vertexes!
i := 0
// TODO: Fix this, based on 4 per eleemnts
vpos := make([]float32, len(elements)*4*4)
elms := make(map[uint32]mS, len(elements))
// Note that the order here is undefined!
ii := 0
for k, v := range elements {
elms[k] = mS{ii, len(v.Nodes())}
for _, vv := range v.Nodes() {
ii++
vpos[i] = float32(nodes[vv][0])
i++
vpos[i] = float32(nodes[vv][1])
i++
vpos[i] = float32(nodes[vv][2])
i++
vpos[i] = 1.0
i++
}
}
/*
for _, v := range nodes {
vpos[i] = float32(v[0])
i++
vpos[i] = float32(v[1])
i++
vpos[i] = float32(v[2])
i++
}
*/
gl.BufferData(gl.ARRAY_BUFFER, gl.Sizeiptr(32/8*len(vpos)), (gl.Pointer)(&vpos[0]), gl.STATIC_DRAW)
gl.BindBuffer(gl.ARRAY_BUFFER, 0)
gl.BindBuffer(gl.ARRAY_BUFFER, positionBufferObject)
gl.EnableVertexAttribArray(0)
gl.VertexAttribPointer(0, 4, gl.FLOAT, gl.FALSE, 0, (gl.Pointer)(nil))
/* for _,v := range elms {
}
*/
for _, v := range elms {
gl.DrawArrays(gl.LINE_LOOP, gl.Int(v.Start), gl.Sizei(v.Length))
}
// Draw Coordinate acis
/*for i := 9; i < 9+2*5; i += 2 {
gl.DrawArrays(gl.LINE_STRIP, gl.Int(i), 2)
}*/
}