public void Draw(Image texture, Rectangle area, float opacity = 1.0f)
{
//init the data we need uo upload
Transform transform = new Transform();
RenderConfig renderConfig = new RenderConfig();
transform.World = Matrix4x4.CreateTranslation(new System.Numerics.Vector3(area.Left, area.Top, 0));
transform.World = Matrix4x4.CreateScale(new System.Numerics.Vector3(area.Right - area.Left, area.Bottom - area.Top, 1)) * transform.World;
transform.Projection = Matrix4x4.CreateOrthographicOffCenter(0, mSwapChain.Size.Width, 0, mSwapChain.Size.Height, 0, 1);
renderConfig.Opacity = new System.Numerics.Vector4(opacity);
//upload it to gpu memory
mTransformBuffer.Update(transform);
mRenderConfigBuffer.Update(renderConfig);
//set resource to shader
mDevice.SetBuffer(mTransformBuffer, mTransformBufferSlot, GpuShaderType.VertexShader);
mDevice.SetBuffer(mRenderConfigBuffer, mRenderConfigBufferSlot, GpuShaderType.PixelShader);
mDevice.SetSamplerState(mGpuSamplerState, mSamplerStateSlot, GpuShaderType.PixelShader);
mDevice.SetResourceUsage(texture.GpuResourceUsage, mTextureSlot, GpuShaderType.PixelShader);
//draw
mDevice.DrawIndexed(6, 0, 0);
}
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 DrawImage(Rectangle <float> rectangle, Image image, Color <float> color)
{
//fill rectangle with texture
//the result color's alpha is equal texture.alpha * opacity
MatrixData matrixData = new MatrixData();
RenderConfig renderConfig = new RenderConfig()
{
Color = color
};
//1.scale the rectangle
matrixData.World = Matrix4x4.CreateScale(rectangle.Right - rectangle.Left, rectangle.Bottom - rectangle.Top, 1.0f);
//2.translate it
matrixData.World *= Matrix4x4.CreateTranslation(rectangle.Left, rectangle.Top, 0.0f);
//3.keep transform matrix data
matrixData.World *= Transform;
//set projection matrix
matrixData.Project = mProject;
mMatrixDataBuffer.Update(matrixData);
mRenderConfigBuffer.Update(renderConfig);
mDevice.SetPixelShader(mTexturePixelShader);
mDevice.SetVertexBuffer(mSquareVertexBuffer);
mDevice.SetIndexBuffer(mSquareIndexBuffer);
mDevice.SetSamplerState(mSamplerState, mSamplerStateSlot, GpuShaderType.PixelShader);
mDevice.SetBuffer(mMatrixDataBuffer, mMatrixDataBufferSlot, GpuShaderType.VertexShader);
mDevice.SetBuffer(mRenderConfigBuffer, mRenderConfigBufferSlot, GpuShaderType.PixelShader);
mDevice.SetResourceUsage(image.GpuResourceUsage, mTextureSlot, GpuShaderType.PixelShader);
mDevice.DrawIndexed(6, 0, 0);
}
