//Draws all the sprites in the supplied slice
func (sheet SpriteSheet) Draw(sprites []*Sprite) {
gl.Enable(gl.TEXTURE_2D)
sheet.texture.Bind(gl.TEXTURE_2D)
for _, sprite := range sprites {
gl.Begin(gl.TRIANGLE_STRIP)
{
gl.TexCoord2f(sprite.left, sprite.bottom)
gl.Vertex2f(sprite.X, sprite.Y)
gl.TexCoord2f(sprite.left, sprite.top)
gl.Vertex2f(sprite.X, sprite.Y+sprite.H)
gl.TexCoord2f(sprite.right, sprite.bottom)
gl.Vertex2f(sprite.X+sprite.W, sprite.Y)
gl.TexCoord2f(sprite.right, sprite.top)
gl.Vertex2f(sprite.X+sprite.W, sprite.Y+sprite.H)
}
gl.End()
}
sheet.texture.Unbind(gl.TEXTURE_2D)
gl.Disable(gl.TEXTURE_2D)
}
func drawPaddle(x float32, y float32) {
gl.PushMatrix()
gl.Translatef(float32(x), float32(y), 0)
gl.Color3f(1.0, 1.0, 1.0)
gl.Begin(gl.LINE_STRIP)
gl.Vertex2f(0, -5)
gl.Vertex2f(0, 5)
gl.End()
gl.PopMatrix()
}
func drawQuad(srcwidth, destwidth, srcheight, destheight float32) {
gl.Begin(gl.QUADS)
gl.TexCoord2i(0, 0)
gl.Vertex2f(-1, -1)
gl.TexCoord2i(int(srcwidth), 0)
gl.Vertex2f(-1+destwidth, -1)
gl.TexCoord2i(int(srcwidth), int(srcheight))
gl.Vertex2f(-1+destwidth, -1+destheight)
gl.TexCoord2i(0, int(srcheight))
gl.Vertex2f(-1, -1+destheight)
gl.End()
}
func drawBall(angle float32, ball_x float32, ball_y float32) {
gl.PushMatrix()
gl.Color3f(1, 1, 1)
gl.Translatef(ball_x, ball_y, 0.0)
gl.Begin(gl.LINE_LOOP)
for rad := 0.0; rad < 1.0; rad += 0.01 {
gl.Vertex2f(
float32(2.0*math.Cos(2.0*math.Pi*rad)),
float32(2.0*math.Sin(2.0*math.Pi*rad)+0.2))
}
gl.End()
gl.Rotatef(angle, 0.0, 0.0, 1.0)
gl.Begin(gl.LINE_STRIP)
gl.Vertex2f(0, 0)
gl.Vertex2f(2, 0)
gl.End()
gl.PopMatrix()
}
func display() {
gl.Clear(gl.COLOR_BUFFER_BIT)
gl.Begin(gl.TRIANGLES)
l := t.units
for e := l.Front(); e != nil; e = e.Next() {
b := e.Value.(*Entity)
//r := b.rot_matrix
p := b.pos
gl.Color3f(0.0, 0.0, 1.0) /* blue */
gl.Vertex2f(p[0], p[1])
gl.Color3f(0.0, 1.0, 0.0) /* green */
gl.Vertex2f(20+p[0], 20+p[1])
gl.Color3f(1.0, 0.0, 0.0) /* red */
gl.Vertex2f(p[0], 20+p[1])
}
gl.End()
gl.Flush() /* Single buffered, so needs a flush. */
glut.SwapBuffers()
}
func main() {
err := initGL()
if err != nil {
log.Printf("InitGL: %v", err)
return
}
defer glfw.Terminate()
// Create our texture atlas.
atlas := glh.NewTextureAtlas(AtlasSize, AtlasSize, 4)
defer atlas.Release()
// Fill the altas with image data.
fillAtlas(atlas)
// Display the atlas texture on a quad, so we can see
// what it looks like.
for glfw.WindowParam(glfw.Opened) > 0 {
gl.Clear(gl.COLOR_BUFFER_BIT)
// Bind the atlas texture and render a quad with it.
atlas.Bind(gl.TEXTURE_2D)
gl.Begin(gl.QUADS)
gl.TexCoord2f(0, 0)
gl.Vertex2f(0, 0)
gl.TexCoord2f(1, 0)
gl.Vertex2f(AtlasSize, 0)
gl.TexCoord2f(1, 1)
gl.Vertex2f(AtlasSize, AtlasSize)
gl.TexCoord2f(0, 1)
gl.Vertex2f(0, AtlasSize)
gl.End()
atlas.Unbind(gl.TEXTURE_2D)
glfw.SwapBuffers()
}
}
// vertex draws vertices.
// Used in classic render mode.
func (a *Attr) vertex(i int) {
i *= a.size
switch a.size {
case 2:
switch v := a.data.(type) {
case []int16:
gl.Vertex2s(v[i], v[i+1])
case []int32:
gl.Vertex2i(int(v[i]), int(v[i+1]))
case []float32:
gl.Vertex2f(v[i], v[i+1])
case []float64:
gl.Vertex2d(v[i], v[i+1])
}
case 3:
switch v := a.data.(type) {
case []int16:
gl.Vertex3s(v[i], v[i+1], v[i+2])
case []int32:
gl.Vertex3i(int(v[i]), int(v[i+1]), int(v[i+2]))
case []float32:
gl.Vertex3f(v[i], v[i+1], v[i+2])
case []float64:
gl.Vertex3d(v[i], v[i+1], v[i+2])
}
case 4:
switch v := a.data.(type) {
case []int16:
gl.Vertex4s(v[i], v[i+1], v[i+2], v[i+3])
case []int32:
gl.Vertex4i(int(v[i]), int(v[i+1]), int(v[i+2]), int(v[i+3]))
case []float32:
gl.Vertex4f(v[i], v[i+1], v[i+2], v[i+3])
case []float64:
gl.Vertex4d(v[i], v[i+1], v[i+2], v[i+3])
}
}
}
func (r *RenderTarget) Render(verts []Vertex, primType PrimitiveType, states RenderStates) {
// Nothing to draw?
if len(verts) == 0 {
return
}
// First set the persistent OpenGL states if it's the very first call
if !r.glStatesSet {
r.resetGlStates()
}
// Check if the vertex count is low enough so that we can pre-transform them
// TODO: Fix vertex cache
useVertexCache := /*len(verts) <= vertexCacheSize*/ false
if useVertexCache {
// Pre-transform the vertices and store them into the vertex cache
for i := 0; i < len(verts); i++ {
r.vertexCache[i].Pos = states.Transform.TransformPoint(verts[i].Pos)
r.vertexCache[i].Color = verts[i].Color
r.vertexCache[i].TexCoords = verts[i].TexCoords
}
// Since vertices are transformed, we must use an identity transform to render them
if !r.useVertexCache {
r.applyTransform(IdentityTransform())
}
} else {
r.applyTransform(states.Transform)
}
// Apply the view
if r.viewChanged {
r.applyCurrentView()
}
// Apply the blend mode
if states.BlendMode != r.lastBlendMode {
//r.applyBlendMode(states.BlendMode)
}
// Apply the texture
var textureId uint64
if states.Texture != nil {
textureId = states.Texture.cacheId
}
if textureId != r.lastTextureId {
r.applyTexture(states.Texture)
}
// Apply the shader
// TODO
/*if states.shader {
applyShader(states.shader);
}*/
// If we pre-transform the vertices, we must use our internal vertex cache
if useVertexCache {
// ... and if we already used it previously, we don't need to set the pointers again
if !r.useVertexCache {
verts = r.vertexCache[:]
} else {
verts = nil
}
}
// #########################################
if len(verts) > 0 {
// Find the OpenGL primitive type
modes := [...]gl.GLenum{gl.POINTS, gl.LINES, gl.LINE_STRIP, gl.TRIANGLES,
gl.TRIANGLE_STRIP, gl.TRIANGLE_FAN, gl.QUADS}
mode := modes[primType]
gl.Begin(mode)
for i, _ := range verts {
gl.TexCoord2f(verts[i].TexCoords.X, verts[i].TexCoords.Y)
gl.Color4f(verts[i].Color.R/255, verts[i].Color.G/255,
verts[i].Color.B/255, verts[i].Color.A/255)
gl.Vertex2f(verts[i].Pos.X, verts[i].Pos.Y)
}
gl.End()
}
// #########################################
// Setup the pointers to the vertices' components
/*if len(verts) > 0 {
vData := make([]Vector2, len(verts))
//cData := make([]byte, len(verts))
tData := make([]Vector2, len(verts))
for i, _ := range verts {
vData[i] = verts[i].Pos
//cData[i] = verts[i].Color
tData[i] = verts[i].TexCoords
}
//const char* data = reinterpret_cast<const char*>(vertices);
gl.VertexPointer(2, gl.FLOAT, 0, vData)
//gl.ColorPointer(4, gl.UNSIGNED_BYTE, unsafe.Sizeof(Vertex), cData))
gl.TexCoordPointer(2, gl.FLOAT, 0, tData)
}
// Find the OpenGL primitive type
modes := [...]gl.GLenum{gl.POINTS, gl.LINES, gl.LINE_STRIP, gl.TRIANGLES,
gl.TRIANGLE_STRIP, gl.TRIANGLE_FAN, gl.QUADS}
mode := modes[primType]
// Draw the primitives
gl.DrawArrays(mode, 0, len(verts))*/
// Unbind the shader, if any
// TODO
/*if (states.shader) {
r.applyShader(nil)
}*/
// Update the cache
r.useVertexCache = useVertexCache
}
// loadFont loads the given font data. This does not deal with font scaling.
// Scaling should be handled by the independent Bitmap/Truetype loaders.
// We therefore expect the supplied image and charset to already be adjusted
// to the correct font scale.
//
// The image should hold a sprite sheet, defining the graphical layout for
// every glyph. The config describes font metadata.
func loadFont(img *image.RGBA, config *FontConfig) (f *Font, err error) {
f = new(Font)
f.config = config
// Resize image to next power-of-two.
img = glh.Pow2Image(img).(*image.RGBA)
ib := img.Bounds()
// Create the texture itself. It will contain all glyphs.
// Individual glyph-quads display a subset of this texture.
f.texture = gl.GenTexture()
f.texture.Bind(gl.TEXTURE_2D)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR)
gl.TexImage2D(gl.TEXTURE_2D, 0, gl.RGBA, ib.Dx(), ib.Dy(), 0,
gl.RGBA, gl.UNSIGNED_BYTE, img.Pix)
// Create display lists for each glyph.
f.listbase = gl.GenLists(len(config.Glyphs))
texWidth := float32(ib.Dx())
texHeight := float32(ib.Dy())
for index, glyph := range config.Glyphs {
// Update max glyph bounds.
if glyph.Width > f.maxGlyphWidth {
f.maxGlyphWidth = glyph.Width
}
if glyph.Height > f.maxGlyphHeight {
f.maxGlyphHeight = glyph.Height
}
// Quad width/height
vw := float32(glyph.Width)
vh := float32(glyph.Height)
// Texture coordinate offsets.
tx1 := float32(glyph.X) / texWidth
ty1 := float32(glyph.Y) / texHeight
tx2 := (float32(glyph.X) + vw) / texWidth
ty2 := (float32(glyph.Y) + vh) / texHeight
// Advance width (or height if we render top-to-bottom)
adv := float32(glyph.Advance)
gl.NewList(f.listbase+uint(index), gl.COMPILE)
{
gl.Begin(gl.QUADS)
{
gl.TexCoord2f(tx1, ty2)
gl.Vertex2f(0, 0)
gl.TexCoord2f(tx2, ty2)
gl.Vertex2f(vw, 0)
gl.TexCoord2f(tx2, ty1)
gl.Vertex2f(vw, vh)
gl.TexCoord2f(tx1, ty1)
gl.Vertex2f(0, vh)
}
gl.End()
switch config.Dir {
case LeftToRight:
gl.Translatef(adv, 0, 0)
case RightToLeft:
gl.Translatef(-adv, 0, 0)
case TopToBottom:
gl.Translatef(0, -adv, 0)
}
}
gl.EndList()
}
err = glh.CheckGLError()
return
}
func (r *RenderTarget) Render(verts []Vertex, primType PrimitiveType, states RenderStates) {
// Nothing to draw?
if len(verts) == 0 {
return
}
// First set the persistent OpenGL states if it's the very first call
if !r.glStatesSet {
r.resetGlStates()
}
// Check if the vertex count is low enough so that we can pre-transform them
useVertexCache := len(verts) <= vertexCacheSize
if useVertexCache {
// Pre-transform the vertices and store them into the vertex cache
for i := 0; i < len(verts); i++ {
r.vpCache[i] = states.Transform.TransformPoint(verts[i].Pos)
r.vcCache[i] = verts[i].Color
r.vtCache[i] = verts[i].TexCoords
}
// Since vertices are transformed, we must use an identity transform to render them
if !r.useVertexCache {
r.applyTransform(IdentityTransform())
}
} else {
r.applyTransform(states.Transform)
}
// Apply the view
if r.viewChanged {
r.applyCurrentView()
}
// Apply the blend mode
if states.BlendMode != r.lastBlendMode {
r.applyBlendMode(states.BlendMode)
}
// Apply the texture
var textureId uint64
if states.Texture != nil {
textureId = states.Texture.cacheId
}
if textureId != r.lastTextureId {
r.applyTexture(states.Texture)
}
// Apply the shader
// TODO
/*if states.shader {
applyShader(states.shader);
}*/
// #########################################
if !useVertexCache {
// Find the OpenGL primitive type
modes := [...]gl.GLenum{gl.POINTS, gl.LINES, gl.LINE_STRIP, gl.TRIANGLES,
gl.TRIANGLE_STRIP, gl.TRIANGLE_FAN, gl.QUADS}
mode := modes[primType]
gl.Begin(mode)
for i, _ := range verts {
gl.TexCoord2f(verts[i].TexCoords.X, verts[i].TexCoords.Y)
gl.Color4f(float32(verts[i].Color.R)/255, float32(verts[i].Color.G)/255,
float32(verts[i].Color.B)/255, float32(verts[i].Color.A)/255)
gl.Vertex2f(verts[i].Pos.X, verts[i].Pos.Y)
}
gl.End()
}
// #########################################
// Setup the pointers to the vertices' components
// ... and if we already used it previously, we don't need to set the pointers again
if useVertexCache {
if !r.useVertexCache {
gl.VertexPointer(2, gl.FLOAT, 0, r.vpCache[:])
gl.ColorPointer(4, gl.UNSIGNED_BYTE, 0, r.vcCache[:])
gl.TexCoordPointer(2, gl.FLOAT, 0, r.vtCache[:])
}
// Find the OpenGL primitive type
modes := [...]gl.GLenum{gl.POINTS, gl.LINES, gl.LINE_STRIP, gl.TRIANGLES,
gl.TRIANGLE_STRIP, gl.TRIANGLE_FAN, gl.QUADS}
mode := modes[primType]
// Draw the primitives
gl.DrawArrays(mode, 0, len(verts))
}
// Unbind the shader, if any
// TODO
/*if (states.shader) {
r.applyShader(nil)
}*/
// Update the cache
r.useVertexCache = useVertexCache
}
func renderBlock_(color ColorDef, w, h, radius, lineWidth float32) {
setColor(color)
gl.Begin(gl.QUADS)
// Render inner square
gl.Vertex2f(radius, radius)
gl.Vertex2f(radius, h-radius)
gl.Vertex2f(w-radius, h-radius)
gl.Vertex2f(w-radius, radius)
// Render top square
gl.Vertex2f(radius, h-radius)
gl.Vertex2f(radius, h)
gl.Vertex2f(w-radius, h)
gl.Vertex2f(w-radius, h-radius)
// Render bottom square
gl.Vertex2f(radius, radius)
gl.Vertex2f(radius, 0)
gl.Vertex2f(w-radius, 0)
gl.Vertex2f(w-radius, radius)
// Render left square
gl.Vertex2f(w-radius, radius)
gl.Vertex2f(w, radius)
gl.Vertex2f(w, h-radius)
gl.Vertex2f(w-radius, h-radius)
// Render right square
gl.Vertex2f(radius, radius)
gl.Vertex2f(0, radius)
gl.Vertex2f(0, h-radius)
gl.Vertex2f(radius, h-radius)
gl.End()
// Render bottom right corner
ww, hh := float64(w-radius), float64(h-radius)
renderCorner(color, ww, hh, 0, radius, lineWidth)
// Render bottom left corner
ww, hh = float64(radius), float64(h-radius)
renderCorner(color, ww, hh, 1, radius, lineWidth)
// Render top left corner
ww, hh = float64(radius), float64(radius)
renderCorner(color, ww, hh, 2, radius, lineWidth)
// Render top right corner
ww, hh = float64(w-radius), float64(radius)
renderCorner(color, ww, hh, 3, radius, lineWidth)
if lineWidth != 0 {
// Render the shape
gl.LineWidth(lineWidth)
gl.Color3i(0, 0, 0)
gl.Begin(gl.LINES)
gl.Vertex2f(radius, 0)
gl.Vertex2f(w-radius, 0)
gl.Vertex2f(0, radius)
gl.Vertex2f(0, h-radius)
gl.Vertex2f(w, radius)
gl.Vertex2f(w, h-radius)
gl.Vertex2f(radius, h)
gl.Vertex2f(w-radius, h)
gl.End()
}
gl.PopMatrix()
}