func LoadTexture(name string) (tex gl.Texture, err error) {
imgFile, err := asset.Open(name)
if err != nil {
return
}
img, _, err := image.Decode(imgFile)
if err != nil {
return
}
rgba := image.NewRGBA(img.Bounds())
image_draw.Draw(rgba, rgba.Bounds(), img, image.Point{0, 0}, image_draw.Src)
tex = gl.CreateTexture()
gl.ActiveTexture(gl.TEXTURE0)
gl.BindTexture(gl.TEXTURE_2D, tex)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE)
gl.TexImage2D(
gl.TEXTURE_2D,
0,
rgba.Rect.Size().X,
rgba.Rect.Size().Y,
gl.RGBA,
gl.UNSIGNED_BYTE,
rgba.Pix)
return
}
func (video *Video) drawFrame() {
gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)
gl.UseProgram(video.prog)
gl.ActiveTexture(gl.TEXTURE0)
gl.BindTexture(gl.TEXTURE_2D, video.texture)
log.Print("Reading")
frame := <-video.pixelBuffer
buf := make([]float32, len(frame))
log.Print("Read frame")
for k, v := range frame {
buf[k] = float32(v)
}
log.Print("Writing")
if video.pixelBuffer != nil {
gl.TexImage2D(gl.TEXTURE_2D, 0, 256, 256, gl.RGBA,
gl.UNSIGNED_SHORT_4_4_4_4, f32.Bytes(binary.LittleEndian, buf...))
}
log.Print("Wrote")
gl.DrawArrays(gl.TRIANGLES, 0, 6)
video.fpsmanager.FramerateDelay()
}
func (w *windowImpl) Draw(src2dst f64.Aff3, src screen.Texture, sr image.Rectangle, op draw.Op, opts *screen.DrawOptions) {
t := src.(*textureImpl)
a := w.vertexAff3(sr)
gl.UseProgram(w.s.texture.program)
writeAff3(w.s.texture.mvp, mul(a, src2dst))
// OpenGL's fragment shaders' UV coordinates run from (0,0)-(1,1),
// unlike vertex shaders' XY coordinates running from (-1,+1)-(+1,-1).
//
// We are drawing a rectangle PQRS, defined by two of its
// corners, onto the entire texture. The two quads may actually
// be equal, but in the general case, PQRS can be smaller.
//
// (0,0) +---------------+ (1,0)
// | P +-----+ Q |
// | | | |
// | S +-----+ R |
// (0,1) +---------------+ (1,1)
//
// The PQRS quad is always axis-aligned. First of all, convert
// from pixel space to texture space.
tw := float64(t.size.X)
th := float64(t.size.Y)
px := float64(sr.Min.X-0) / tw
py := float64(sr.Min.Y-0) / th
qx := float64(sr.Max.X-0) / tw
sy := float64(sr.Max.Y-0) / th
// Due to axis alignment, qy = py and sx = px.
//
// The simultaneous equations are:
// 0 + 0 + a02 = px
// 0 + 0 + a12 = py
// a00 + 0 + a02 = qx
// a10 + 0 + a12 = qy = py
// 0 + a01 + a02 = sx = px
// 0 + a11 + a12 = sy
writeAff3(w.s.texture.uvp, f64.Aff3{
qx - px, 0, px,
0, sy - py, py,
})
gl.ActiveTexture(gl.TEXTURE0)
gl.BindTexture(gl.TEXTURE_2D, t.id)
gl.Uniform1i(w.s.texture.sample, 0)
gl.BindBuffer(gl.ARRAY_BUFFER, w.s.texture.quadXY)
gl.EnableVertexAttribArray(w.s.texture.pos)
gl.VertexAttribPointer(w.s.texture.pos, 2, gl.FLOAT, false, 0, 0)
gl.BindBuffer(gl.ARRAY_BUFFER, w.s.texture.quadUV)
gl.EnableVertexAttribArray(w.s.texture.inUV)
gl.VertexAttribPointer(w.s.texture.inUV, 2, gl.FLOAT, false, 0, 0)
gl.DrawArrays(gl.TRIANGLE_STRIP, 0, 4)
gl.DisableVertexAttribArray(w.s.texture.pos)
gl.DisableVertexAttribArray(w.s.texture.inUV)
}
func onPaint(sz size.Event) {
gl.ClearColor(rgb(156), rgb(39), rgb(176), 1)
gl.Clear(gl.COLOR_BUFFER_BIT)
var rotationMatrix = []float32{
f32.Cos(-alpha), -f32.Sin(-alpha), 0.0,
f32.Sin(-alpha), f32.Cos(-alpha), 0.0,
0.0, 0.0, 1.0,
}
gl.UseProgram(program)
// setting color
gl.Uniform4f(color, rgb(255), rgb(255), rgb(255), 1)
gl.UniformMatrix3fv(matrixId, rotationMatrix)
gl.Uniform1f(resolutionId, resIndex)
gl.BindBuffer(gl.ARRAY_BUFFER, swasBuffer)
gl.EnableVertexAttribArray(position)
gl.VertexAttribPointer(position, 3, gl.FLOAT, false, 0, 0)
gl.DrawArrays(gl.LINES, 0, 16)
gl.DisableVertexAttribArray(position)
gl.UseProgram(texProgram)
// setting color
gl.Uniform4f(color2, rgb(130), rgb(50), rgb(80), 1)
gl.Uniform1f(resolutionId2, resIndex)
gl.UniformMatrix3fv(matrixId2, rotationMatrix)
gl.BindBuffer(gl.ARRAY_BUFFER, quadBuffer)
gl.EnableVertexAttribArray(position2)
gl.VertexAttribPointer(position2, 3, gl.FLOAT, false, 0, 0)
gl.BindBuffer(gl.ARRAY_BUFFER, quadTexBuffer)
gl.EnableVertexAttribArray(textureCoords)
gl.VertexAttribPointer(textureCoords, 2, gl.FLOAT, false, 0, 0)
gl.Uniform1i(gl.GetUniformLocation(texProgram, "myTexture"), 0)
gl.ActiveTexture(gl.TEXTURE0)
gl.BindTexture(gl.TEXTURE_2D, textureId)
gl.DrawArrays(gl.TRIANGLES, 0, 6)
gl.DisableVertexAttribArray(position2)
gl.DisableVertexAttribArray(textureCoords)
if spin == true {
alpha += 0.1
}
if alpha >= 360 {
alpha = 0.0
}
}
func (video *Video) initGL() {
log.Print("Initing")
video.fpsmanager = gfx.NewFramerate()
video.fpsmanager.SetFramerate(60)
gl.ClearColor(0.0, 0.0, 0.0, 1.0)
gl.Enable(gl.CULL_FACE)
gl.Enable(gl.DEPTH_TEST)
log.Print("Creating program")
video.prog = createProgram(vertShaderSrcDef, fragShaderSrcDef)
log.Print("Attrib loc 1")
posAttrib := attribLocation(video.prog, "vPosition")
log.Print("Attrib loc 2")
texCoordAttr := attribLocation(video.prog, "vTexCoord")
log.Print("Uniform loc 1")
paletteLoc := uniformLocation(video.prog, "palette")
log.Print("Uniform loc 2")
video.textureUni = uniformLocation(video.prog, "texture")
log.Print("Gen Texture")
video.texture = genTexture()
gl.ActiveTexture(gl.TEXTURE0)
gl.BindTexture(gl.TEXTURE_2D, video.texture)
log.Print("TexParam")
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST)
gl.UseProgram(video.prog)
gl.EnableVertexAttribArray(posAttrib)
gl.EnableVertexAttribArray(texCoordAttr)
gl.Uniform3iv(paletteLoc, nes.SPaletteRgb)
log.Print("VertBO")
vertVBO := genBuffer()
checkGLError()
gl.BindBuffer(gl.ARRAY_BUFFER, vertVBO)
verts := f32.Bytes(binary.LittleEndian, -1.0, 1.0, -1.0, -1.0, 1.0, -1.0, 1.0, -1.0, 1.0, 1.0, -1.0, 1.0)
gl.BufferData(gl.ARRAY_BUFFER, verts, gl.STATIC_DRAW)
textCoorBuf := genBuffer()
checkGLError()
gl.BindBuffer(gl.ARRAY_BUFFER, textCoorBuf)
texVerts := f32.Bytes(binary.LittleEndian, 0.0, 1.0, 0.0, 0.0, 1.0, 0.0, 1.0, 0.0, 1.0, 1.0, 0.0, 1.0)
gl.BufferData(gl.ARRAY_BUFFER, texVerts, gl.STATIC_DRAW)
gl.VertexAttribPointer(posAttrib, 2, gl.FLOAT, false, 0, 0)
gl.VertexAttribPointer(texCoordAttr, 2, gl.FLOAT, false, 0, 0)
log.Print("Started")
}
func (e *Engine) Draw(c event.Config) {
since := time.Now().Sub(e.started)
gl.Enable(gl.DEPTH_TEST)
gl.DepthFunc(gl.LESS)
gl.ClearColor(0, 0, 0, 1)
gl.Clear(gl.COLOR_BUFFER_BIT)
gl.Clear(gl.DEPTH_BUFFER_BIT)
gl.UseProgram(e.shader.program)
// Setup MVP
var m mgl.Mat4
m = mgl.Perspective(0.785, float32(c.Width/c.Height), 0.1, 10.0)
gl.UniformMatrix4fv(e.shader.projection, m[:])
m = mgl.LookAtV(
mgl.Vec3{3, 3, 3}, // eye
mgl.Vec3{0, 0, 0}, // center
mgl.Vec3{0, 1, 0}, // up
)
gl.UniformMatrix4fv(e.shader.view, m[:])
m = mgl.HomogRotate3D(float32(since.Seconds()), mgl.Vec3{0, 1, 0})
gl.UniformMatrix4fv(e.shader.model, m[:])
// Draw our shape
gl.BindBuffer(gl.ARRAY_BUFFER, e.shape.buf)
gl.EnableVertexAttribArray(e.shader.vertCoord)
gl.VertexAttribPointer(e.shader.vertCoord, e.shape.coordsPerVertex, gl.FLOAT, false, 20, 0) // 4 bytes in float, 5 values per vertex
gl.EnableVertexAttribArray(e.shader.vertTexCoord)
gl.VertexAttribPointer(e.shader.vertTexCoord, e.shape.texCoordsPerVertex, gl.FLOAT, false, 20, 12)
gl.ActiveTexture(gl.TEXTURE0)
gl.BindTexture(gl.TEXTURE_2D, e.shape.texture)
gl.DrawArrays(gl.TRIANGLES, 0, e.shape.vertexCount)
gl.DisableVertexAttribArray(e.shader.vertCoord)
//debug.DrawFPS(c)
}
// Draw draws the srcBounds part of the image onto a parallelogram, defined by
// three of its corners, in the current GL framebuffer.
func (img *Image) Draw(topLeft, topRight, bottomLeft geom.Point, srcBounds image.Rectangle) {
// TODO(crawshaw): Adjust viewport for the top bar on android?
gl.UseProgram(glimage.program)
{
// We are drawing a parallelogram PQRS, defined by three of its
// corners, onto the entire GL framebuffer ABCD. The two quads may
// actually be equal, but in the general case, PQRS can be smaller,
// and PQRS is not necessarily axis-aligned.
//
// A +---------------+ B
// | P +-----+ Q |
// | | | |
// | S +-----+ R |
// D +---------------+ C
//
// There are two co-ordinate spaces: geom space and framebuffer space.
// In geom space, the ABCD rectangle is:
//
// (0, 0) (geom.Width, 0)
// (0, geom.Height) (geom.Width, geom.Height)
//
// and the PQRS quad is:
//
// (topLeft.X, topLeft.Y) (topRight.X, topRight.Y)
// (bottomLeft.X, bottomLeft.Y) (implicit, implicit)
//
// In framebuffer space, the ABCD rectangle is:
//
// (-1, +1) (+1, +1)
// (-1, -1) (+1, -1)
//
// First of all, convert from geom space to framebuffer space. For
// later convenience, we divide everything by 2 here: px2 is half of
// the P.X co-ordinate (in framebuffer space).
px2 := -0.5 + float32(topLeft.X/geom.Width)
py2 := +0.5 - float32(topLeft.Y/geom.Height)
qx2 := -0.5 + float32(topRight.X/geom.Width)
qy2 := +0.5 - float32(topRight.Y/geom.Height)
sx2 := -0.5 + float32(bottomLeft.X/geom.Width)
sy2 := +0.5 - float32(bottomLeft.Y/geom.Height)
// Next, solve for the affine transformation matrix
// [ a00 a01 a02 ]
// a = [ a10 a11 a12 ]
// [ 0 0 1 ]
// that maps A to P:
// a × [ -1 +1 1 ]' = [ 2*px2 2*py2 1 ]'
// and likewise maps B to Q and D to S. Solving those three constraints
// implies that C maps to R, since affine transformations keep parallel
// lines parallel. This gives 6 equations in 6 unknowns:
// -a00 + a01 + a02 = 2*px2
// -a10 + a11 + a12 = 2*py2
// +a00 + a01 + a02 = 2*qx2
// +a10 + a11 + a12 = 2*qy2
// -a00 - a01 + a02 = 2*sx2
// -a10 - a11 + a12 = 2*sy2
// which gives:
// a00 = (2*qx2 - 2*px2) / 2 = qx2 - px2
// and similarly for the other elements of a.
glimage.mvp.WriteAffine(&f32.Affine{{
qx2 - px2,
px2 - sx2,
qx2 + sx2,
}, {
qy2 - py2,
py2 - sy2,
qy2 + sy2,
}})
}
{
// Mapping texture co-ordinates is similar, except that in texture
// space, the ABCD rectangle is:
//
// (0,0) (1,0)
// (0,1) (1,1)
//
// and the PQRS quad is always axis-aligned. First of all, convert
// from pixel space to texture space.
w := float32(img.texWidth)
h := float32(img.texHeight)
px := float32(srcBounds.Min.X-img.Rect.Min.X) / w
py := float32(srcBounds.Min.Y-img.Rect.Min.Y) / h
qx := float32(srcBounds.Max.X-img.Rect.Min.X) / w
sy := float32(srcBounds.Max.Y-img.Rect.Min.Y) / h
// Due to axis alignment, qy = py and sx = px.
//
// The simultaneous equations are:
// 0 + 0 + a02 = px
// 0 + 0 + a12 = py
// a00 + 0 + a02 = qx
// a10 + 0 + a12 = qy = py
// 0 + a01 + a02 = sx = px
// 0 + a11 + a12 = sy
glimage.uvp.WriteAffine(&f32.Affine{{
qx - px,
0,
px,
}, {
0,
sy - py,
py,
}})
}
gl.ActiveTexture(gl.TEXTURE0)
gl.BindTexture(gl.TEXTURE_2D, img.Texture)
gl.Uniform1i(glimage.textureSample, 0)
gl.BindBuffer(gl.ARRAY_BUFFER, glimage.quadXY)
gl.EnableVertexAttribArray(glimage.pos)
gl.VertexAttribPointer(glimage.pos, 2, gl.FLOAT, false, 0, 0)
gl.BindBuffer(gl.ARRAY_BUFFER, glimage.quadUV)
gl.EnableVertexAttribArray(glimage.inUV)
gl.VertexAttribPointer(glimage.inUV, 2, gl.FLOAT, false, 0, 0)
gl.DrawArrays(gl.TRIANGLE_STRIP, 0, 4)
gl.DisableVertexAttribArray(glimage.pos)
gl.DisableVertexAttribArray(glimage.inUV)
}