public bool GenetateProgram()
{
if (_compute_prog != null)
{
return(_compute_prog.Valid);
}
string source_code = AssembleShaderCode();
if (source_code == null || source_code == "")
{
return(false);
}
_compute_prog = _openGLFactory.ComputeShaderProgram(source_code);
return(_compute_prog.Generate());
}
//! On load window (once)
protected override void OnLoad()
{
_version = openGLFactory.NewVersionInformation(Console.WriteLine);
_extensions = openGLFactory.NewExtensionInformation();
_debug_callback = openGLFactory.NewDebugCallback(Console.WriteLine);
// Version strings
_version.Retrieve();
// Get OpenGL extensions
_extensions.Retrieve();
// Debug callback
_debug_callback.Init();
// create Vertex Array Object, Array Buffer Object and Element Array Buffer Object
float[] vquad =
{
// x y z r g b a
-1.0f, -1.0f, 0.0f, 1.0f, 0.0f, 0.0f, 1.0f,
1.0f, -1.0f, 0.0f, 1.0f, 1.0f, 0.0f, 1.0f,
1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f, 1.0f,
-1.0f, 1.0f, 0.0f, 0.0f, 0.0f, 1.0f, 1.0f
};
uint[] iquad = { 0, 1, 2, 0, 2, 3 };
TVertexFormat[] format =
{
new TVertexFormat(0, 0, 3, 0, false),
new TVertexFormat(0, 1, 4, 3, false),
};
int vao = GL.GenVertexArray();
GL.BindVertexArray(vao);
// Create shader program
string vert_shader = @"
#version 460 core
layout(std430, binding = 0) buffer TVertex
{
vec4 vertex[];
};
uniform mat4 u_mvp;
uniform vec2 u_resolution;
uniform float u_thickness;
void main()
{
int line_i = gl_VertexID / 6;
int tri_i = gl_VertexID % 6;
vec4 va[4];
for (int i=0; i<4; ++i)
{
va[i] = u_mvp * vertex[line_i+i];
va[i].xyz /= va[i].w;
va[i].xy = (va[i].xy + 1.0) * 0.5 * u_resolution;
}
vec2 v_line = normalize(va[2].xy - va[1].xy);
vec2 nv_line = vec2(-v_line.y, v_line.x);
vec4 pos;
if (tri_i == 0 || tri_i == 1 || tri_i == 3)
{
vec2 v_pred = normalize(va[1].xy - va[0].xy);
vec2 v_miter = normalize(nv_line + vec2(-v_pred.y, v_pred.x));
pos = va[1];
pos.xy += v_miter * u_thickness * (tri_i == 1 ? -0.5 : 0.5) / dot(v_miter, nv_line);
}
else
{
vec2 v_succ = normalize(va[3].xy - va[2].xy);
vec2 v_miter = normalize(nv_line + vec2(-v_succ.y, v_succ.x));
pos = va[2];
pos.xy += v_miter * u_thickness * (tri_i == 5 ? 0.5 : -0.5) / dot(v_miter, nv_line);
}
pos.xy = pos.xy / u_resolution * 2.0 - 1.0;
pos.xyz *= pos.w;
gl_Position = pos;
}";
string frag_shader = @"
#version 460 core
out vec4 fragColor;
uniform vec4 u_color;
void main()
{
fragColor = u_color;
}";
_test_prog = openGLFactory.VertexAndFragmentShaderProgram(vert_shader, frag_shader);
_test_prog.Generate();
mvpLocation = GL.GetUniformLocation(this._test_prog.Object, "u_mvp");
resolutionLocation = GL.GetUniformLocation(this._test_prog.Object, "u_resolution");
thicknessLocation = GL.GetUniformLocation(this._test_prog.Object, "u_thickness");
colorLocation = GL.GetUniformLocation(this._test_prog.Object, "u_color");
_test_prog.Use();
float[] p0 = { -1.0f, -1.0f, 0.0f, 1.0f };
float[] p1 = { 1.0f, -1.0f, 0.0f, 1.0f };
float[] p2 = { 1.0f, 1.0f, 0.0f, 1.0f };
float[] p3 = { -1.0f, 1.0f, 0.0f, 1.0f };
float[] line1 = p3.Concat(p0).Concat(p1).Concat(p2).Concat(p3).Concat(p0).Concat(p1).ToArray();
_lineBuffer1 = openGLFactory.NewStorageBuffer();
_lineBuffer1.Create(line1);
_no_vertices_1 = line1.Length / 4;
var ll2 = new List <float>();
for (int u = -8; u <= 368; u += 8)
{
double a = u * Math.PI / 180.0;
double c = Math.Cos(a), s = Math.Sin(a);
ll2.AddRange(new float[] { (float)c, (float)s, 0.0f, 1.0f });
}
float[] line2 = ll2.ToArray();
_lineBuffer2 = openGLFactory.NewStorageBuffer();
_lineBuffer2.Create(line2);
_no_vertices_2 = line2.Length / 4;
// states
GL.ClearColor(0.8f, 0.9f, 1.0f, 1.0f);
base.OnLoad();
}