func LoadTextureCube(filename string) {
surface := loadSdlSurface(filename)
defer surface.Free()
W := surface.W / 4
H := surface.H / 3
top_rect := sdl.Rect{W, 0 * H, W, H}
bottom_rect := sdl.Rect{W, 2 * H, W, H}
left_rect := sdl.Rect{0 * W, H, W, H}
front_rect := sdl.Rect{1 * W, H, W, H}
right_rect := sdl.Rect{2 * W, H, W, H}
back_rect := sdl.Rect{3 * W, H, W, H}
bounds := sdl.Rect{0, 0, W, H}
imageData, _ := sdl.CreateRGBSurface(0, W, H, 32, surface.Format.Rmask, surface.Format.Gmask, surface.Format.Bmask, surface.Format.Amask)
surface.Blit(&top_rect, imageData, &bounds)
gl.TexImage2D(gl.TEXTURE_CUBE_MAP_POSITIVE_Y, 0, gl.RGBA, int(W), int(H), 0, gl.RGBA, gl.UNSIGNED_BYTE, imageData.Pixels())
surface.Blit(&bottom_rect, imageData, &bounds)
gl.TexImage2D(gl.TEXTURE_CUBE_MAP_NEGATIVE_Y, 0, gl.RGBA, int(W), int(H), 0, gl.RGBA, gl.UNSIGNED_BYTE, imageData.Pixels())
surface.Blit(&left_rect, imageData, &bounds)
gl.TexImage2D(gl.TEXTURE_CUBE_MAP_NEGATIVE_X, 0, gl.RGBA, int(W), int(H), 0, gl.RGBA, gl.UNSIGNED_BYTE, imageData.Pixels())
surface.Blit(&right_rect, imageData, &bounds)
gl.TexImage2D(gl.TEXTURE_CUBE_MAP_POSITIVE_X, 0, gl.RGBA, int(W), int(H), 0, gl.RGBA, gl.UNSIGNED_BYTE, imageData.Pixels())
surface.Blit(&back_rect, imageData, &bounds)
gl.TexImage2D(gl.TEXTURE_CUBE_MAP_NEGATIVE_Z, 0, gl.RGBA, int(W), int(H), 0, gl.RGBA, gl.UNSIGNED_BYTE, imageData.Pixels())
surface.Blit(&front_rect, imageData, &bounds)
gl.TexImage2D(gl.TEXTURE_CUBE_MAP_POSITIVE_Z, 0, gl.RGBA, int(W), int(H), 0, gl.RGBA, gl.UNSIGNED_BYTE, imageData.Pixels())
}
func newLCD(width, height int) *lcd {
window, err := sdl.CreateWindow("Game Boy",
sdl.WINDOWPOS_CENTERED, sdl.WINDOWPOS_CENTERED,
width, height,
sdl.WINDOW_SHOWN)
if err != nil {
log.Fatal(err)
}
windowSurface, err := window.GetSurface()
if err != nil {
window.Destroy()
log.Fatal(err)
}
surface, err := sdl.CreateRGBSurface(0, lcdWidth, lcdHeight, 32,
0x000000ff, 0x0000ff00, 0x00ff0000, 0xff000000)
if err != nil {
window.Destroy()
log.Fatal(err)
}
return &lcd{window, windowSurface, surface, []byte{},
[lcdWidth * lcdHeight]uint8{}, width, height}
}
// MakeFillSurfaceAlpha makes a new rectangular surface and fills with with RGBA
func MakeFillSurfaceAlpha(width, height int32, red, green, blue, alpha uint8) (*sdl.Surface, error) {
pf, err := sdl.AllocFormat(sdl.PIXELFORMAT_RGBA8888)
if err != nil {
return nil, err
}
color := sdl.MapRGBA(pf, red, green, blue, alpha)
surface, err := sdl.CreateRGBSurface(0, width, height, 32, pf.Rmask, pf.Gmask, pf.Bmask, pf.Amask)
if err != nil {
return nil, err
}
surface.FillRect(&sdl.Rect{X: 0, Y: 0, W: width, H: height}, color)
return surface, nil
}
// surfaceManipulate is an internal function that creates a new surface, gets
// metadata, and then calls a passed-in function to actually do something to it,
// e.g. horizontally flip all the pixels.
//
// Note: this only supports manipulations that leave the Surface the same
// dimensions. It could potentially be generalized to handle manipulations that
// leave the Surface with the same number of pixels.
func surfaceManipulate(src *sdl.Surface, f func(src *sdl.Surface, srcWBytes, bytesPerPixel int32, srcPx, destPx []byte)) (*sdl.Surface, error) {
pf := src.Format
pixels := src.Pixels()
bytesPP := int32(pf.BytesPerPixel)
bitsPP := int32(pf.BitsPerPixel)
newSurface, err := sdl.CreateRGBSurface(0, src.W, src.H, bitsPP, pf.Rmask, pf.Gmask, pf.Bmask, pf.Amask)
if err != nil {
return nil, err
}
pixelsDest := newSurface.Pixels()
srcWBytes := int32(src.W * bytesPP)
// Perform the manipulation
f(src, srcWBytes, bytesPP, pixels, pixelsDest)
return newSurface, nil
}
// MakeEmptySurfaceFrom makes a new empty surface the same size and format of the given surface.
// WARNING: does not handle palettized images!
func MakeEmptySurfaceFrom(src *sdl.Surface) (*sdl.Surface, error) {
pf := src.Format
return sdl.CreateRGBSurface(0, src.W, src.H, int32(pf.BitsPerPixel), pf.Rmask, pf.Gmask, pf.Bmask, pf.Amask)
}