public virtual void BeginDraw(Image image)
{
//begin draw and we need set the render target before we draw anything
//reset device and set render target
mDevice.Reset();
mDevice.SetRenderTarget(image.GpuRenderTarget);
//set blend state
mDevice.SetBlendState(mBlendState);
//set input layout ,vertex shader and primitive type
mDevice.SetInputLayout(mInputLayout);
mDevice.SetPixelShader(mPixelShader);
mDevice.SetVertexShader(mVertexShader);
mDevice.SetPrimitiveType(GpuPrimitiveType.TriangleList);
//set view port
mDevice.SetViewPort(new Rectanglef(0, 0, image.Size.Width, image.Size.Height));
mDevice.SetSamplerState(mSamplerState, mSamplerStateSlot, GpuShaderType.All);
//set the project matrix, need set null when we end draw
mProject = Matrix4x4.CreateOrthographicOffCenter(
0, image.Size.Width,
0, image.Size.Height, 0, 1);
}
public virtual void DrawLine(Position <float> start, Position <float> end, Color <float> color,
float padding = 2.0f)
{
//draw line with start and end position
//padding means the width of line
//color.Alpha means the opacity of line
//first, we compute the matrix of world transform
MatrixData matrixData = new MatrixData();
Vector2 vector = new Vector2(end.X - start.X, end.Y - start.Y);
//1.compute the scale component, x-component is euqal the length of line, y-component is equal the padding
matrixData.World = Matrix4x4.CreateScale(vector.Length(), padding, 1.0f);
//2.compute the angle of rotate, we only rotate it at the z-axis
matrixData.World *= Matrix4x4.CreateRotationZ((float)Math.Atan2(vector.Y, vector.X), new Vector3(0, padding * 0.5f, 0));
//3.compute the translation, the position of start, but the y is start.y - padding * 0.5f
matrixData.World *= Matrix4x4.CreateTranslation(new Vector3(start.X, start.Y - padding * 0.5f, 0));
//4.keep transform matrix data
matrixData.World *= Transform;
//set project matrix
matrixData.Project = mProject;
//second, we set the render config
RenderConfig renderConfig = new RenderConfig()
{
Color = color
};
//update buffer
mMatrixDataBuffer.Update(matrixData);
mRenderConfigBuffer.Update(renderConfig);
//set buffer and shader
mDevice.SetPixelShader(mColorPixelShader);
mDevice.SetVertexBuffer(mSquareVertexBuffer);
mDevice.SetIndexBuffer(mSquareIndexBuffer);
mDevice.SetBuffer(mMatrixDataBuffer, mMatrixDataBufferSlot, GpuShaderType.VertexShader);
mDevice.SetBuffer(mRenderConfigBuffer, mRenderConfigBufferSlot, GpuShaderType.PixelShader);
//draw
mDevice.DrawIndexed(6, 0, 0);
}
public void BeginDraw()
{
//reset graphics pipeline and set render target
mDevice.Reset();
mDevice.SetRenderTarget(mSwapChain.RenderTarget);
mDevice.ClearRenderTarget(mSwapChain.RenderTarget, new Colorf(1, 1, 1, 1));
//set graphics pipeline
mDevice.SetBlendState(mBlendState);
mDevice.SetInputLayout(mInputLayout);
mDevice.SetVertexBuffer(mVertexBuffer);
mDevice.SetIndexBuffer(mIndexBuffer);
mDevice.SetPrimitiveType(GpuPrimitiveType.TriangleList);
mDevice.SetVertexShader(mVertexShader);
mDevice.SetPixelShader(mDrawPixelShader);
mDevice.SetViewPort(new Rectanglef(0, 0, mSwapChain.Size.Width, mSwapChain.Size.Height));
}
public void BeginDraw(Image image, RenderMode mode)
{
//begin draw and we need set the render target before we draw anything
Mode = mode;
//reset device and set render target
mDevice.Reset();
mDevice.SetRenderTarget(image);
//set blend and raster state and input layout
mDevice.SetBlendState(mBlendState);
mDevice.SetInputLayout(mInputLayout);
mDevice.SetRasterizerState(mRasterizerState);
//set vertex shader, pixel shader
switch (Mode)
{
case RenderMode.Fill:
mDevice.SetPixelShader(mFillBezierPixelShader);
mDevice.SetVertexShader(mFillBezierVertexShader);
break;
case RenderMode.Draw:
mDevice.SetPixelShader(mDrawBezierPixelShader);
mDevice.SetVertexShader(mDrawBezierVertexShader);
break;
default: throw new Exception("Mode Not Supported.");
}
//set primitive type
mDevice.SetPrimitiveType(GpuPrimitiveType.TriangleList);
//set view port
mDevice.SetViewPort(new Rectangle <float>(0, 0, image.Size.Width, image.Size.Height));
//set the project matrix, need set null when we end draw
mProjection = Matrix4x4.CreateOrthographicOffCenter(
0, image.Size.Width,
0, image.Size.Height, 0, 1);
//set the canvas size
mCanvasSize = image.Size;
}