func display() {
// Clear the background as white
gl.ClearColor(1.0, 1.0, 1.0, 1.0)
gl.Clear(gl.COLOR_BUFFER_BIT)
// Use the GLSL program
gl.UseProgram(program)
gl.BindBuffer(gl.ARRAY_BUFFER, vboTriangle)
gl.EnableVertexAttribArray(attributeCoord2d)
// Describe our vertices array to OpenGL (it can't guess its format automatically)
gl.VertexAttribPointer(attributeCoord2d, 2, gl.FLOAT, gl.FALSE, 0, gl.Pointer(nil))
gl.EnableVertexAttribArray(attributeColor)
gl.BindBuffer(gl.ARRAY_BUFFER, vboTriangleColors)
gl.VertexAttribPointer(attributeColor, 3, gl.FLOAT, gl.FALSE, 0, gl.Pointer(nil))
// Push each element in buffer_vertices to the vertex shader
gl.DrawArrays(gl.TRIANGLES, 0, 3)
gl.DisableVertexAttribArray(attributeCoord2d)
gl.DisableVertexAttribArray(attributeColor)
gl.BindBuffer(gl.ARRAY_BUFFER, 0) // Unbind
// Display the result
glfw.SwapBuffers()
}
func drawgl() {
gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)
uniYaw = yrot * (math.Pi / 180.0)
yrot = yrot - 1.0
uniPitch = zrot * (math.Pi / 180.0)
zrot = zrot - 0.5
uniRoll = xrot * (math.Pi / 180.0)
xrot = xrot - 0.2
gl.Uniform4f(UniScale, gl.Float(uniRoll), gl.Float(uniYaw), gl.Float(uniPitch), gl.Float(uniscale))
gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)
gl.DrawArrays(gl.TRIANGLES, gl.Int(0), gl.Sizei(len(triangle_vertices)*4))
time.Sleep(50 * time.Millisecond)
}
func drawPrimitives(color color.Color, mode gl.Enum, vecs ...geometry.Vector2) {
vertices := make([]float32, len(vecs)*2)
r, g, b, a := glcolor.ConvertColorF(color)
var colors []float32
for i := range vecs {
vertices[i*2] = vecs[i].X
vertices[i*2+1] = vecs[i].Y
colors = append(colors, r, g, b, a)
}
DefaultPrimitivesShaderProgram.Use()
primitivesUniformMatrix.UniformMatrix4fv(1, false, DefaultCamera.Transposed())
primitivesAttributeCoord.Enable()
primitivesAttributeCoord.AttribPointer(2, gl.FLOAT, false, 0, gl.Pointer(&vertices[0]))
primitivesAttributeColor.Enable()
primitivesAttributeColor.AttribPointer(4, gl.FLOAT, false, 0, gl.Pointer(&colors[0]))
gl.DrawArrays(mode, 0, gl.Sizei(len(vecs)))
primitivesAttributeColor.Disable()
primitivesAttributeCoord.Disable()
}
func (vbo *VertexBufferObject) DrawArrays(start, end int) {
gl.DrawArrays(gl.TRIANGLES, gl.Int(start), gl.Sizei(end))
}
