private Mesh CreateDegenerateTriangleMesh()
{
Mesh mesh = new Mesh();
mesh.PrimitiveType = PrimitiveType.Triangles;
mesh.FrontFaceWindingOrder = WindingOrder.Counterclockwise;
int numberOfPositions = _clipmapSegments * 4;
VertexAttributeFloatVector2 positionsAttribute = new VertexAttributeFloatVector2("position", numberOfPositions);
IList <Vector2F> positions = positionsAttribute.Values;
mesh.Attributes.Add(positionsAttribute);
int numberOfIndices = (_clipmapSegments / 2) * 3 * 4;
IndicesUnsignedShort indices = new IndicesUnsignedShort(numberOfIndices);
mesh.Indices = indices;
for (int i = 0; i < _clipmapPosts; ++i)
{
positions.Add(new Vector2F(0.0f, i));
}
for (int i = 1; i < _clipmapPosts; ++i)
{
positions.Add(new Vector2F(i, _clipmapSegments));
}
for (int i = _clipmapSegments - 1; i >= 0; --i)
{
positions.Add(new Vector2F(_clipmapSegments, i));
}
for (int i = _clipmapSegments - 1; i > 0; --i)
{
positions.Add(new Vector2F(i, 0.0f));
}
for (int i = 0; i < numberOfIndices; i += 2)
{
indices.AddTriangle(new TriangleIndicesUnsignedShort((ushort)i, (ushort)(i + 1), (ushort)(i + 2)));
}
return(mesh);
}
public Triangle()
{
_window = Device.CreateWindow(800, 600, "Chapter 3: Triangle");
_window.Resize += OnResize;
_window.RenderFrame += OnRenderFrame;
_sceneState = new SceneState();
_clearState = new ClearState();
string vs =
@"#version 330
layout(location = og_positionVertexLocation) in vec4 position;
uniform mat4 og_modelViewPerspectiveMatrix;
void main()
{
gl_Position = og_modelViewPerspectiveMatrix * position;
}";
string fs =
@"#version 330
out vec3 fragmentColor;
uniform vec3 u_color;
void main()
{
fragmentColor = u_color;
}";
ShaderProgram sp = Device.CreateShaderProgram(vs, fs);
((Uniform <Vector3F>)sp.Uniforms["u_color"]).Value = new Vector3F(1, 0, 0);
///////////////////////////////////////////////////////////////////
Mesh mesh = new Mesh();
VertexAttributeFloatVector3 positionsAttribute = new VertexAttributeFloatVector3("position", 3);
mesh.Attributes.Add(positionsAttribute);
IndicesUnsignedShort indices = new IndicesUnsignedShort(3);
mesh.Indices = indices;
IList <Vector3F> positions = positionsAttribute.Values;
positions.Add(new Vector3F(0, 0, 0));
positions.Add(new Vector3F(1, 0, 0));
positions.Add(new Vector3F(0, 0, 1));
indices.AddTriangle(new TriangleIndicesUnsignedShort(0, 1, 2));
VertexArray va = _window.Context.CreateVertexArray(mesh, sp.VertexAttributes, BufferHint.StaticDraw);
///////////////////////////////////////////////////////////////////
RenderState renderState = new RenderState();
renderState.FacetCulling.Enabled = false;
renderState.DepthTest.Enabled = false;
_drawState = new DrawState(renderState, sp, va);
///////////////////////////////////////////////////////////////////
_sceneState.Camera.ZoomToTarget(1);
}