func main() {
var winTitle string = "Go-SDL2 + Go-GL"
var winWidth, winHeight int = 800, 600
var window *sdl.Window
var context sdl.GLContext
var event sdl.Event
var running bool
if 0 != sdl.Init(sdl.INIT_EVERYTHING) {
panic(sdl.GetError())
}
window = sdl.CreateWindow(winTitle, sdl.WINDOWPOS_UNDEFINED, sdl.WINDOWPOS_UNDEFINED,
winWidth, winHeight, sdl.WINDOW_OPENGL)
if window == nil {
panic(sdl.GetError())
}
context = sdl.GL_CreateContext(window)
if context == nil {
panic(sdl.GetError())
}
gl.Enable(gl.DEPTH_TEST)
gl.ClearColor(0.2, 0.2, 0.3, 1.0)
gl.ClearDepth(1)
gl.DepthFunc(gl.LEQUAL)
gl.Viewport(0, 0, int32(winWidth), int32(winHeight))
running = true
for running {
for event = sdl.PollEvent(); event != nil; event = sdl.PollEvent() {
switch t := event.(type) {
case *sdl.QuitEvent:
running = false
case *sdl.MouseMotionEvent:
fmt.Printf("[%d ms] MouseMotion\tid:%d\tx:%d\ty:%d\txrel:%d\tyrel:%d\n", t.Timestamp, t.Which, t.X, t.Y, t.XRel, t.YRel)
}
}
drawgl()
sdl.GL_SwapWindow(window)
}
sdl.GL_DeleteContext(context)
window.Destroy()
sdl.Quit()
}
func TestBindVariables(t *testing.T) {
if sdl.Init(sdl.INIT_EVERYTHING) != 0 {
panic(sdl.GetError())
}
window := sdl.CreateWindow("test", 0, 0, 320, 200, sdl.WINDOW_HIDDEN|sdl.WINDOW_OPENGL)
sdl.GL_SetAttribute(sdl.GL_CONTEXT_PROFILE_MASK, sdl.GL_CONTEXT_PROFILE_ES)
sdl.GL_SetAttribute(sdl.GL_CONTEXT_MAJOR_VERSION, 2)
sdl.GL_SetAttribute(sdl.GL_CONTEXT_MINOR_VERSION, 0)
glctx := sdl.GL_CreateContext(window)
vs := gl.CreateShader(gl.VERTEX_SHADER)
vs.Source(`
uniform mat4 u_projection;
uniform vec2 u_size;
attribute vec2 a_vertex;
attribute vec2 a_texcoord;
varying vec2 v_texcoord;
void main()
{
v_texcoord = a_texcoord;
gl_Position = u_projection * vec4(a_vertex * u_size, 0, 1);
}
`)
vs.Compile()
fs := gl.CreateShader(gl.FRAGMENT_SHADER)
fs.Source(`
precision mediump float;
uniform sampler2D u_tex;
uniform vec4 u_color;
varying vec2 v_texcoord;
void main()
{
gl_FragColor = texture2D(u_tex, v_texcoord).a * u_color;
}
`)
fs.Compile()
p := gl.CreateProgram()
p.AttachShader(vs)
p.AttachShader(fs)
p.Link()
var v struct {
Proj gl.UniformMatrix4f `glsl:"u_projection"`
Size gl.Uniform2f `glsl:"u_size"`
Tex gl.Uniform1i `glsl:"u_tex"`
Color gl.Uniform4f `glsl:"u_color"`
Vertices gl.Vec2Attrib `glsl:"a_vertex"`
TexCoords gl.Vec2Attrib `glsl:"a_texcoord"`
}
p.BindVariables(&v)
uniforms := []gl.Uniform{v.Proj, v.Size, v.Tex, v.Color}
cksum := 0
for _, u := range uniforms {
cksum |= 1 << uint(u.Location())
}
if cksum != 0xF {
t.Errorf("unexpected uniform locations: %#x", cksum)
}
attributes := []gl.VertexAttrib{v.Vertices, v.TexCoords}
cksum = 0
for _, a := range attributes {
cksum |= 1 << uint(a.Index())
}
if cksum != 0x3 {
t.Errorf("unexpected attribute locations: %#x", cksum)
}
sdl.GL_DeleteContext(glctx)
window.Destroy()
sdl.Quit()
}
func main() {
var window *sdl.Window
var context sdl.GLContext
var event sdl.Event
var running bool
runtime.LockOSThread()
if 0 != sdl.Init(sdl.INIT_EVERYTHING) {
panic(sdl.GetError())
}
window = sdl.CreateWindow(winTitle, sdl.WINDOWPOS_UNDEFINED,
sdl.WINDOWPOS_UNDEFINED,
winWidth, winHeight, sdl.WINDOW_OPENGL)
if window == nil {
panic(sdl.GetError())
}
context = sdl.GL_CreateContext(window)
if context == nil {
panic(sdl.GetError())
}
gl.Init()
gl.Viewport(0, 0, gl.Sizei(winWidth), gl.Sizei(winHeight))
// OPENGL FLAGS
gl.ClearColor(0.0, 0.1, 0.0, 1.0)
gl.Enable(gl.DEPTH_TEST)
gl.DepthFunc(gl.LESS)
gl.Enable(gl.BLEND)
gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)
// VERTEX BUFFER
var vertexbuffer gl.Uint
gl.GenBuffers(1, &vertexbuffer)
gl.BindBuffer(gl.ARRAY_BUFFER, vertexbuffer)
gl.BufferData(gl.ARRAY_BUFFER, gl.Sizeiptr(len(triangle_vertices)*4), gl.Pointer(&triangle_vertices[0]), gl.STATIC_DRAW)
// COLOUR BUFFER
var colourbuffer gl.Uint
gl.GenBuffers(1, &colourbuffer)
gl.BindBuffer(gl.ARRAY_BUFFER, colourbuffer)
gl.BufferData(gl.ARRAY_BUFFER, gl.Sizeiptr(len(triangle_colours)*4), gl.Pointer(&triangle_colours[0]), gl.STATIC_DRAW)
// GUESS WHAT
program := createprogram()
// VERTEX ARRAY
var VertexArrayID gl.Uint
gl.GenVertexArrays(1, &VertexArrayID)
gl.BindVertexArray(VertexArrayID)
gl.EnableVertexAttribArray(0)
gl.BindBuffer(gl.ARRAY_BUFFER, vertexbuffer)
gl.VertexAttribPointer(0, 3, gl.FLOAT, gl.FALSE, 0, nil)
// VERTEX ARRAY HOOK COLOURS
gl.EnableVertexAttribArray(1)
gl.BindBuffer(gl.ARRAY_BUFFER, colourbuffer)
gl.VertexAttribPointer(1, 3, gl.FLOAT, gl.FALSE, 0, nil)
//UNIFORM HOOK
unistring := gl.GLString("scaleMove")
UniScale = gl.GetUniformLocation(program, unistring)
fmt.Printf("Uniform Link: %v\n", UniScale+1)
gl.UseProgram(program)
running = true
for running {
for event = sdl.PollEvent(); event != nil; event =
sdl.PollEvent() {
switch t := event.(type) {
case *sdl.QuitEvent:
running = false
case *sdl.MouseMotionEvent:
xrot = float32(t.Y) / 2
yrot = float32(t.X) / 2
fmt.Printf("[%dms]MouseMotion\tid:%d\tx:%d\ty:%d\txrel:%d\tyrel:%d\n", t.Timestamp, t.Which, t.X, t.Y, t.XRel, t.YRel)
}
}
drawgl()
sdl.GL_SwapWindow(window)
}
sdl.GL_DeleteContext(context)
window.Destroy()
sdl.Quit()
}