func InitGL(width, height, msaa int, fullscreen bool) {
C.SDL_Init(C.SDL_INIT_VIDEO)
C.SDL_VideoInit( /*nil*/ C.SDL_GetVideoDriver(0))
C.SDL_GL_SetAttribute(C.SDL_GL_CONTEXT_MAJOR_VERSION, 3)
C.SDL_GL_SetAttribute(C.SDL_GL_CONTEXT_MINOR_VERSION, 2)
if msaa != 0 {
C.SDL_GL_SetAttribute(C.SDL_GL_MULTISAMPLEBUFFERS, 1)
C.SDL_GL_SetAttribute(C.SDL_GL_MULTISAMPLESAMPLES, C.int(msaa))
}
C.SDL_GL_SetAttribute(C.SDL_GL_DEPTH_SIZE, 16)
//win = C.SDL_CreateWindow(nil, C.SDL_WINDOWPOS_CENTERED, C.SDL_WINDOWPOS_CENTERED,C.int(width), C.int(height), C.SDL_WINDOW_OPENGL)
if fullscreen {
win = C.SDL_CreateWindow(nil, C.SDL_WINDOWPOS_CENTERED, C.SDL_WINDOWPOS_CENTERED, C.int(width), C.int(height), C.SDL_WINDOW_OPENGL|C.SDL_WINDOW_FULLSCREEN_DESKTOP)
} else {
win = C.SDL_CreateWindow(nil, C.SDL_WINDOWPOS_CENTERED, C.SDL_WINDOWPOS_CENTERED, C.int(width), C.int(height), C.SDL_WINDOW_OPENGL)
}
C.SDL_ShowWindow(win)
wat := C.SDL_GL_CreateContext(win)
fmt.Println(C.GoString(C.SDL_GetVideoDriver(0)))
C.SDL_GL_MakeCurrent(win, wat)
//C.SDL_GL_SetSwapInterval(1)
C.glEnable(C.GL_DEPTH_TEST)
C.glDepthFunc(C.GL_LEQUAL)
C.glClearColor(0.3, 0.5, 1, 0)
C.glClear(C.GL_COLOR_BUFFER_BIT | C.GL_DEPTH_BUFFER_BIT)
printerr("failed to initialize openGL")
}
func BeginFrame(width, height int, devicePixelRatio float32) {
w := C.GLsizei(float32(width) * devicePixelRatio)
h := C.GLsizei(float32(height) * devicePixelRatio)
C.glViewport(0, 0, w, h)
C.glClearColor(0, 0, 0, 1)
C.glClear(C.GL_COLOR_BUFFER_BIT | C.GL_DEPTH_BUFFER_BIT | C.GL_STENCIL_BUFFER_BIT)
C.nvgBeginFrame(vg, C.int(width), C.int(height), C.float(devicePixelRatio))
}
// ClearColor specifies clear values for the color buffers.
func ClearColor(col color.Color) {
r, g, b, a := col.RGBA()
C.glClearColor(
C.GLclampf(r)/255.0,
C.GLclampf(g)/255.0,
C.GLclampf(b)/255.0,
C.GLclampf(a)/255.0)
}
func ClearColor(
red Clampf, green Clampf,
blue Clampf, alpha Clampf) {
C.glClearColor(
C.GLclampf(red),
C.GLclampf(green),
C.GLclampf(blue),
C.GLclampf(alpha))
}
func (game *game) initGL() {
log.Printf("GL_VERSION: %v GL_RENDERER: %v GL_VENDOR %v\n",
GetString(C.GL_VERSION), GetString(C.GL_RENDERER), GetString(C.GL_VENDOR))
log.Printf("GL_EXTENSIONS: %v\n", GetString(C.GL_EXTENSIONS))
C.glClearColor(0.0, 0.0, 0.0, 1.0)
C.glEnable(C.GL_CULL_FACE)
C.glEnable(C.GL_DEPTH_TEST)
game.prog = createProgram(vertShaderSrcDef, fragShaderSrcDef)
posAttrib := attribLocation(game.prog, "vPosition")
game.offsetUni = uniformLocation(game.prog, "offset")
game.colorUni = uniformLocation(game.prog, "color")
C.glUseProgram(game.prog)
C.glEnableVertexAttribArray(C.GLuint(posAttrib))
vertVBO := GenBuffer()
checkGLError()
C.glBindBuffer(C.GL_ARRAY_BUFFER, vertVBO)
verts := []float32{.0, 0.5, -0.5, -0.5, 0.5, -0.5}
C.glBufferData(C.GL_ARRAY_BUFFER, C.GLsizeiptr(len(verts)*int(unsafe.Sizeof(verts[0]))), unsafe.Pointer(&verts[0]), C.GL_STATIC_DRAW)
C.glVertexAttribPointer(C.GLuint(posAttrib), 2, C.GL_FLOAT, C.GL_FALSE, 0, unsafe.Pointer(uintptr(0)))
}
// ClearColor calls glClearColor
func ClearColor(r float64, g float64, b float64, a float64) {
C.glClearColor(C.GLclampf(r), C.GLclampf(g), C.GLclampf(b), C.GLclampf(a))
}
func ClearColor(red, green, blue, alpha float32) {
C.glClearColor(C.GLclampf(red), C.GLclampf(green), C.GLclampf(blue), C.GLclampf(alpha))
}
func ClearColor(red, green, blue, alpha float32) {
C.glClearColor(C.GLfloat(red), C.GLfloat(green), C.GLfloat(blue), C.GLfloat(alpha))
}
func Test(win window.Window) {
C.glClearColor(1.0, 0.0, 0.0, 0.0)
C.glClear(C.GL_COLOR_BUFFER_BIT | C.GL_DEPTH_BUFFER_BIT | C.GL_STENCIL_BUFFER_BIT)
win.SwapBuffers()
}
func ClearColor(red, green, blue, alpha float32) {
C.glClearColor(
(C.GLclampf)(red), (C.GLclampf)(green),
(C.GLclampf)(blue), (C.GLclampf)(alpha))
}
// ClearColor calls glClearColor
func ClearColor(r int, g int, b int, a int) {
C.glClearColor(C.GLclampf(r), C.GLclampf(g), C.GLclampf(b), C.GLclampf(a))
}
func Cls(c col.Colour) {
//
r, g, b := col.Float(c) // 0.0, 0.0, 0.0
C.glClearColor(C.GLclampf(r), C.GLclampf(g), C.GLclampf(b), C.GLclampf(0.0))
}