func initScene() {
halfW, halfH := float32(Width)*0.5, float32(Height)*0.5
Projection = mgl.Ortho2D(-halfW, halfW, -halfH, halfH).Mul4(
mgl.Translate3D(-halfW, -halfH, 0))
ModelView = mgl.Ident4f().Mul4(mgl.Scale3D(100, 100, 0))
MVP <- Projection.Mul4(ModelView)
gl.Disable(gl.DEPTH_TEST)
gl.DepthMask(false)
program := Program(FragmentShader(fsh), VertexShader(vsh))
gl.UseProgram(uint(program))
uMVP = gl.GetUniformLocation(program, "uMVP")
attrPos = gl.GetAttribLocation(program, "pos")
attrColor = gl.GetAttribLocation(program, "color")
gl.EnableVertexAttribArray(uint(attrPos))
gl.EnableVertexAttribArray(uint(attrColor))
gl.ClearColor(0.0, 0.0, 0.0, 1.0)
gl.VertexAttribPointer(uint(attrPos), 2, gl.FLOAT, false, 0, uintptr(gl.Void(&POSITION[0])))
gl.VertexAttribPointer(uint(attrColor), 4, gl.FLOAT, false, 0, uintptr(gl.Void(&COLOR[0])))
}
func NewWorld(width, height int) *World {
gl.Enable(gl.DEPTH_TEST)
gl.ClearColor(0.0, 0.0, 0.0, 0.0)
gl.Viewport(0, 0, gl.Sizei(width), gl.Sizei(height))
return &World{
Width: width,
Height: height,
objects: make([]*Cube, 0),
projection: mathgl.Perspective(60, float32(width)/float32(height), 1, 20), // makePerspective(60.0, float32(width)/float32(height), 1.0, 20.0),
view: mathgl.Ident4f(),
}
}
func NewCube() *Cube {
cube := new(Cube)
cube.model = mathgl.Ident4f()
cube.Vertices = NewBufferFloat([]float32{
// Front
1, -1, 1, 1, TEX_COORD_MAX, 0,
1, 1, 1, 1, TEX_COORD_MAX, TEX_COORD_MAX,
-1, 1, 1, 1, 0, TEX_COORD_MAX,
-1, -1, 1, 1, 0, 0,
// Back
1, 1, -1, 1, TEX_COORD_MAX, 0,
-1, -1, -1, 1, 0, TEX_COORD_MAX,
1, -1, -1, 1, TEX_COORD_MAX, TEX_COORD_MAX,
-1, 1, -1, 1, 0, 0,
// Left
-1, -1, 1, 1, TEX_COORD_MAX, 0,
-1, 1, 1, 1, TEX_COORD_MAX, TEX_COORD_MAX,
-1, 1, -1, 1, 0, TEX_COORD_MAX,
-1, -1, -1, 1, 0, 0,
// Right
1, -1, -1, 1, TEX_COORD_MAX, 0,
1, 1, -1, 1, TEX_COORD_MAX, TEX_COORD_MAX,
1, 1, 1, 1, 0, TEX_COORD_MAX,
1, -1, 1, 1, 0, 0,
// Top
1, 1, 1, 1, TEX_COORD_MAX, 0,
1, 1, -1, 1, TEX_COORD_MAX, TEX_COORD_MAX,
-1, 1, -1, 1, 0, TEX_COORD_MAX,
-1, 1, 1, 1, 0, 0,
// Bottom
1, -1, -1, 1, TEX_COORD_MAX, 0,
1, -1, 1, 1, TEX_COORD_MAX, TEX_COORD_MAX,
-1, -1, 1, 1, 0, TEX_COORD_MAX,
-1, -1, -1, 1, 0, 0,
})
cube.indices = NewBufferByte([]byte{
// Front
0, 1, 2,
2, 3, 0,
// Back
4, 5, 6,
4, 5, 7,
// Left
8, 9, 10,
10, 11, 8,
// Right
12, 13, 14,
14, 15, 12,
// Top
16, 17, 18,
18, 19, 16,
// Bottom
20, 21, 22,
22, 23, 20,
})
fragmentShader := (FragmentShader)(`
precision highp float;
varying vec2 texOut;
uniform sampler2D texture;
void main() {
gl_FragColor = texture2D(texture, texOut);
}
`)
vertexShader := (VertexShader)(`
uniform mat4 model;
uniform mat4 projection_view;
attribute vec4 pos;
attribute vec2 texIn;
varying vec2 texOut;
void main() {
gl_Position = projection_view*model*pos;
texOut = texIn;
}
`)
fsh := fragmentShader.Compile()
vsh := vertexShader.Compile()
cube.Program.Link(fsh, vsh)
cube.Program.Use()
cube.attrPos = cube.Program.GetAttribute("pos")
cube.attrColor = cube.Program.GetAttribute("color")
cube.attrTexIn = cube.Program.GetAttribute("texIn")
cube.uniformTexture = cube.Program.GetUniform("texture")
cube.uniformModel = cube.Program.GetUniform("model")
cube.uniformProjectionView = cube.Program.GetUniform("projection_view")
gl.EnableVertexAttribArray(cube.attrPos)
gl.EnableVertexAttribArray(cube.attrColor)
gl.EnableVertexAttribArray(cube.attrTexIn)
return cube
}