// drawScene renders the 3D models consisting of one VAO
func (tag *trtag) drawScene() {
gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)
tag.checkError("gl.Clear")
gl.UseProgram(tag.shaders)
tag.checkError("gl.UseProgram")
gl.BindVertexArray(tag.vao)
tag.checkError("gl.BindVertexArray")
// Use a modelview matrix and quaternion to rotate the 3D object.
tag.mvp64.SetQ(lin.NewQ().SetAa(0, 1, 0, lin.Rad(-tag.rotateAngle)))
tag.mvp64.TranslateMT(0, 0, -4)
tag.mvp64.Mult(tag.mvp64, tag.persp)
tag.mvp32 = renderMatrix(tag.mvp64, tag.mvp32)
gl.UniformMatrix4fv(tag.mvpRef, 1, false, tag.mvp32.Pointer())
if err := gl.GetError(); err != 0 {
fmt.Printf("gl.UniformMatrix error %d\n", err)
}
gl.DrawElements(gl.TRIANGLES, int32(len(tag.faces)), gl.UNSIGNED_BYTE, gl.Pointer(nil))
if err := gl.GetError(); err != 0 {
fmt.Printf("gl.DrawElements error %d\n", err)
}
// cleanup
gl.UseProgram(0)
tag.checkError("gl.UseProgram-0")
gl.BindVertexArray(0)
tag.checkError("gl.BindVertexArray-0")
// rotate based on time... not on how fast the computer runs.
if time.Now().Sub(tag.lastTime).Seconds() > 0.01 {
tag.rotateAngle += 1
tag.lastTime = time.Now()
}
}
// drawScene renders the shader-only scene.
func (sf *sftag) drawScene() {
gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)
gl.UseProgram(sf.shaders)
gl.BindVertexArray(sf.vao)
timeSinceStart := time.Since(sf.sTime).Seconds()
gl.Uniform1f(sf.gTime, float32(timeSinceStart))
gl.Uniform2f(sf.sizes, 500, 500)
sf.mvp32 = renderMatrix(sf.ortho, sf.mvp32)
gl.UniformMatrix4fv(sf.mvpref, 1, false, sf.mvp32.Pointer())
gl.DrawElements(gl.TRIANGLES, int32(len(sf.faces)), gl.UNSIGNED_BYTE, gl.Pointer(nil))
// cleanup
gl.UseProgram(0)
gl.BindVertexArray(0)
}
// drawScene renders the scene consisting of one VAO.
func (tb *tbtag) drawScene() {
gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)
gl.UseProgram(tb.shaders)
gl.Uniform1i(tb.sampler, 0)
gl.ActiveTexture(gl.TEXTURE0 + 0)
gl.BindTexture(gl.TEXTURE_2D, tb.texture.Tid)
gl.BindVertexArray(tb.vao)
tb.mvp32 = renderMatrix(tb.ortho, tb.mvp32)
gl.UniformMatrix4fv(tb.mvpref, 1, false, tb.mvp32.Pointer())
gl.DrawElements(gl.TRIANGLES, int32(len(tb.faces)), gl.UNSIGNED_BYTE, gl.Pointer(nil))
// cleanup
gl.ActiveTexture(0)
gl.UseProgram(0)
gl.BindVertexArray(0)
}
// sh is used to test and showcase the vu/device package. Just getting a window
// to appear demonstrates that the majority of the functionality is working.
// The remainder of the example dumps keyboard and mouse events showing that
// user input is being processed.
func sh() {
sh := &shtag{}
dev := device.New("Shell", 400, 100, 800, 600)
gl.Init()
fmt.Printf("%s %s", gl.GetString(gl.RENDERER), gl.GetString(gl.VERSION))
fmt.Printf(" GLSL %s\n", gl.GetString(gl.SHADING_LANGUAGE_VERSION))
dev.Open()
gl.ClearColor(0.3, 0.6, 0.4, 1.0)
for dev.IsAlive() {
sh.update(dev)
gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)
dev.SwapBuffers()
}
dev.ShowCursor(true)
dev.Dispose()
}
// render draws the scene consisting of one VAO
func (ld *ldtag) render() {
gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)
gl.UseProgram(ld.shaders)
gl.BindVertexArray(ld.vao)
// use a model-view-projection matrix
ld.mvp64.Set(lin.M4I).ScaleSM(0.5, 0.5, 0.5).TranslateMT(0, 0, -2)
ld.mvp64.Mult(ld.mvp64, ld.persp)
v3 := renderMatrix(ld.mvp64, ld.mvp32)
gl.UniformMatrix4fv(ld.mvpref, 1, false, v3.Pointer())
gl.CullFace(gl.BACK)
gl.DrawElements(gl.TRIANGLES, ld.faceCount, gl.UNSIGNED_SHORT, gl.Pointer(nil))
// cleanup
gl.UseProgram(0)
gl.BindVertexArray(0)
}
func (gc *opengl) Clear() { gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT) }
