Exemplo n.º 1
0
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)
}
Exemplo n.º 2
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))
		}
	}
}
Exemplo n.º 3
0
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),
		)
	}
}
Exemplo n.º 4
0
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.
	}
}