func (s *shaderProgram) bind(ctx *context, vb *vertexBuffer, uniforms uniformBindings) {
gl.UseProgram(s.program)
for _, a := range s.attributes {
vs, found := vb.streams[a.name]
if !found {
panic(fmt.Errorf("VertexBuffer missing required stream '%s'", a.name))
}
if a.ty != vs.ty {
panic(fmt.Errorf("Attribute '%s' type '%s' does not match stream type '%s'",
a.name, a.ty, vs.ty))
}
elementCount := a.ty.vectorElementCount()
elementTy := a.ty.vectorElementType()
ctx.getOrCreateVertexStreamContext(vs).bind()
a.enableArray()
a.attribPointer(int32(elementCount), uint32(elementTy), false, 0, 0)
}
for _, u := range s.uniforms {
v, found := uniforms[u.name]
if !found {
panic(fmt.Errorf("Uniforms missing '%s'", u.name))
}
u.bind(ctx, v)
}
checkError()
}
func newShaderProgram(ctx *context, vsSource, fsSource string) *shaderProgram {
vs := compile(vsSource, gl.VERTEX_SHADER)
fs := compile(fsSource, gl.FRAGMENT_SHADER)
program := gl.CreateProgram()
gl.AttachShader(program, vs)
gl.AttachShader(program, fs)
gl.LinkProgram(program)
if gl.GetProgrami(program, gl.LINK_STATUS) != gl.TRUE {
panic(gl.GetProgramInfoLog(program))
}
gl.UseProgram(program)
checkError()
uniformCount := gl.GetProgrami(program, gl.ACTIVE_UNIFORMS)
uniforms := make([]shaderUniform, uniformCount)
textureUnit := 0
for i := range uniforms {
name, size, ty := gl.GetActiveUniform(program, uint32(i))
location := gl.GetUniformLocation(program, name)
uniforms[i] = shaderUniform{
name: name,
size: size,
ty: shaderDataType(ty),
location: location,
textureUnit: textureUnit,
}
if ty == gl.SAMPLER_2D {
textureUnit++
}
}
attributeCount := gl.GetProgrami(program, gl.ACTIVE_ATTRIBUTES)
attributes := make([]shaderAttribute, attributeCount)
for i := range attributes {
name, size, ty := gl.GetActiveAttrib(program, uint32(i))
location := gl.GetAttribLocation(program, name)
attributes[i] = shaderAttribute{
name: name,
size: size,
ty: shaderDataType(ty),
location: location,
}
}
ctx.stats.shaderProgramCount++
return &shaderProgram{
program: program,
uniforms: uniforms,
attributes: attributes,
}
}
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]
}