func (s *vertexStream) newContext() *vertexStreamContext {
buffer := gl.CreateBuffer()
gl.BindBuffer(gl.ARRAY_BUFFER, buffer)
gl.BufferData(gl.ARRAY_BUFFER, s.data, gl.STATIC_DRAW)
gl.BindBuffer(gl.ARRAY_BUFFER, gl.Buffer{})
checkError()
return &vertexStreamContext{buffer}
}
func (b *indexBuffer) newContext() *indexBufferContext {
dataVal := reflect.ValueOf(b.data)
length := dataVal.Len() / 2 // HACK: Hardcode support for only ptUshort.
buffer := gl.CreateBuffer()
gl.BindBuffer(gl.ELEMENT_ARRAY_BUFFER, buffer)
gl.BufferData(gl.ELEMENT_ARRAY_BUFFER, b.data, gl.STATIC_DRAW)
gl.BindBuffer(gl.ELEMENT_ARRAY_BUFFER, gl.Buffer{})
checkError()
return &indexBufferContext{
buffer: buffer,
ty: b.ty,
length: length,
}
}
func (p *glParams) renderFlush() {
c := p.context
if len(c.calls) > 0 {
gl.UseProgram(c.shader.program)
gl.BlendFunc(gl.ONE, gl.ONE_MINUS_SRC_ALPHA)
gl.Enable(gl.CULL_FACE)
gl.CullFace(gl.BACK)
gl.FrontFace(gl.CCW)
gl.Enable(gl.BLEND)
gl.Disable(gl.DEPTH_TEST)
gl.Disable(gl.SCISSOR_TEST)
gl.ColorMask(true, true, true, true)
gl.StencilMask(0xffffffff)
gl.StencilOp(gl.KEEP, gl.KEEP, gl.KEEP)
gl.StencilFunc(gl.ALWAYS, 0, 0xffffffff)
gl.ActiveTexture(gl.TEXTURE0)
gl.BindTexture(gl.TEXTURE_2D, gl.Texture{})
c.stencilMask = 0xffffffff
c.stencilFunc = gl.ALWAYS
c.stencilFuncRef = 0
c.stencilFuncMask = 0xffffffff
b := castFloat32ToByte(c.vertexes)
//dumpLog("vertex:", c.vertexes)
// Upload vertex data
gl.BindBuffer(gl.ARRAY_BUFFER, c.vertexBuffer)
gl.BufferData(gl.ARRAY_BUFFER, b, gl.STREAM_DRAW)
gl.EnableVertexAttribArray(c.shader.vertexAttrib)
gl.EnableVertexAttribArray(c.shader.tcoordAttrib)
gl.VertexAttribPointer(c.shader.vertexAttrib, 2, gl.FLOAT, false, 4*4, 0)
gl.VertexAttribPointer(c.shader.tcoordAttrib, 2, gl.FLOAT, false, 4*4, 8)
// Set view and texture just once per frame.
gl.Uniform1i(c.shader.locations[glnvgLocTEX], 0)
gl.Uniform2fv(c.shader.locations[glnvgLocVIEWSIZE], c.view[:])
for i := range c.calls {
call := &c.calls[i]
switch call.callType {
case glnvgFILL:
c.fill(call)
case glnvgCONVEXFILL:
c.convexFill(call)
case glnvgSTROKE:
c.stroke(call)
case glnvgTRIANGLES:
c.triangles(call)
}
}
gl.DisableVertexAttribArray(c.shader.vertexAttrib)
gl.DisableVertexAttribArray(c.shader.tcoordAttrib)
gl.Disable(gl.CULL_FACE)
gl.BindBuffer(gl.ARRAY_BUFFER, gl.Buffer{})
gl.UseProgram(gl.Program{})
c.bindTexture(nil)
}
c.vertexes = c.vertexes[:0]
c.paths = c.paths[:0]
c.calls = c.calls[:0]
c.uniforms = c.uniforms[:0]
}
func (c vertexStreamContext) bind() {
gl.BindBuffer(gl.ARRAY_BUFFER, c.buffer)
}
func (c *indexBufferContext) render(drawMode drawMode) {
gl.BindBuffer(gl.ELEMENT_ARRAY_BUFFER, c.buffer)
gl.DrawElements(gl.Enum(drawMode), c.length, gl.Enum(c.ty), 0)
gl.BindBuffer(gl.ELEMENT_ARRAY_BUFFER, gl.Buffer{})
checkError()
}