func (r *Renderer) drawMesh(ns *nativeShader, m *gfx.Mesh) {
// Grab the native mesh.
native := m.NativeMesh.(*nativeMesh)
// Use vertices data.
location, ok := r.findAttribLocation(ns, "Vertex")
if ok {
r.render.BindBuffer(gl.ARRAY_BUFFER, native.vertices)
r.render.EnableVertexAttribArray(location)
defer r.render.DisableVertexAttribArray(location)
r.render.VertexAttribPointer(location, 3, gl.FLOAT, gl.GLBool(false), 0, nil)
}
if native.colors != 0 {
// Use colors data.
location, ok = r.findAttribLocation(ns, "Color")
if ok {
r.render.BindBuffer(gl.ARRAY_BUFFER, native.colors)
r.render.EnableVertexAttribArray(location)
defer r.render.DisableVertexAttribArray(location)
r.render.VertexAttribPointer(location, 4, gl.FLOAT, gl.GLBool(false), 0, nil)
}
}
if native.bary != 0 {
// Use bary data.
location, ok = r.findAttribLocation(ns, "Bary")
if ok {
r.render.BindBuffer(gl.ARRAY_BUFFER, native.bary)
r.render.EnableVertexAttribArray(location)
defer r.render.DisableVertexAttribArray(location)
r.render.VertexAttribPointer(location, 3, gl.FLOAT, gl.GLBool(false), 0, nil)
}
}
// Use each texture coordinate set data.
for index, texCoords := range native.texCoords {
name := texCoordName(index)
location, ok = r.findAttribLocation(ns, name)
if ok {
r.render.BindBuffer(gl.ARRAY_BUFFER, texCoords)
r.render.EnableVertexAttribArray(location)
defer r.render.DisableVertexAttribArray(location)
r.render.VertexAttribPointer(location, 2, gl.FLOAT, gl.GLBool(false), 0, nil)
}
}
if native.indicesCount > 0 {
// Draw indexed mesh.
r.render.BindBuffer(gl.ELEMENT_ARRAY_BUFFER, native.indices)
r.render.DrawElements(gl.TRIANGLES, native.indicesCount, gl.UNSIGNED_INT, nil)
} else {
// Draw regular mesh.
r.render.DrawArrays(gl.TRIANGLES, 0, native.verticesCount)
}
// Unbind buffer to avoid carrying OpenGL state.
r.render.BindBuffer(gl.ARRAY_BUFFER, 0)
}
func (r *Renderer) stateDepthWrite(enabled bool) {
if r.last.depthWrite != enabled {
r.last.depthWrite = enabled
if enabled {
r.render.DepthMask(gl.GLBool(true))
} else {
r.render.DepthMask(gl.GLBool(false))
}
}
}
func (r *Renderer) stateColorWrite(cr, g, b, a bool) {
cw := [4]bool{cr, g, b, a}
if r.last.colorWrite != cw {
r.last.colorWrite = cw
r.render.ColorMask(
gl.GLBool(cr),
gl.GLBool(g),
gl.GLBool(b),
gl.GLBool(a),
)
}
}
func (r *Renderer) updateUniform(native *nativeShader, name string, value interface{}) {
location := r.findUniformLocation(native, name)
if location == -1 {
// The uniform is not used by the shader program and should just be
// dropped.
return
}
switch v := value.(type) {
case texSlot:
// Special case: Texture input uniform.
r.render.Uniform1i(location, int32(v))
case bool:
var intBool int32
if v {
intBool = 1
}
r.render.Uniform1iv(location, 1, &intBool)
case float32:
r.render.Uniform1fv(location, 1, &v)
case []float32:
if len(v) > 0 {
r.render.Uniform1fv(location, uint32(len(v)), &v[0])
}
case gfx.Vec3:
r.render.Uniform3fv(location, 1, &v.X)
case []gfx.Vec3:
if len(v) > 0 {
r.render.Uniform3fv(location, uint32(len(v)), &v[0].X)
}
case gfx.Mat4:
r.render.UniformMatrix4fv(location, 1, gl.GLBool(false), &v[0][0])
case []gfx.Mat4:
if len(v) > 0 {
r.render.UniformMatrix4fv(location, uint32(len(v)), gl.GLBool(false), &v[0][0][0])
}
default:
// We don't know of the type at all, ignore it.
}
}