/// <summary>
/// Function to return the appropriate draw call based on the states provided.
/// </summary>
/// <param name="texture">The texture to display.</param>
/// <param name="blendState">The blending state for the texture.</param>
/// <param name="samplerState">The sampler state for the texture.</param>
/// <param name="shader">The pixel shader to use.</param>
/// <param name="constantBuffers">Constant buffers for the pixel shader, if required.</param>
private void GetDrawCall(GorgonTexture2DView texture, GorgonBlendState blendState, GorgonSamplerState samplerState, GorgonPixelShader shader, GorgonConstantBuffers constantBuffers)
{
if ((_drawCall != null) &&
(shader == _pixelShader) &&
(_drawCall.PixelShader.Samplers[0] == samplerState) &&
(_pipelineState.BlendStates[0] == blendState) &&
(_drawCall.PixelShader.ShaderResources[0] == texture) &&
(_drawCall.PixelShader.ConstantBuffers.DirtyEquals(constantBuffers)))
{
// This draw call hasn't changed, so return the previous one.
return;
}
if (_pipelineState.BlendStates[0] != blendState)
{
_pipelineState = _pipeStateBuilder
.BlendState(blendState)
.Build();
_drawCallBuilder.PipelineState(_pipelineState);
}
_drawCall = _drawCallBuilder.ConstantBuffers(ShaderType.Pixel, constantBuffers)
.SamplerState(ShaderType.Pixel, samplerState)
.ShaderResource(ShaderType.Pixel, texture)
.Build(_drawAllocator);
}
/// <summary>
/// Function to flush the cache data into the buffers and render the renderables.
/// </summary>
/// <param name="drawCall">The draw call that will be used to render the renderables.</param>
public void RenderBatches(GorgonDrawCall drawCall)
{
GorgonVertexBuffer vertexBuffer = VertexBuffer.VertexBuffer;
int cacheIndex = _currentVertexIndex - _allocatedVertexCount;
while (_allocatedVertexCount > 0)
{
int vertexCount = _allocatedVertexCount.Min(MaxVertexCount);
int byteCount = Gorgon2DVertex.SizeInBytes * vertexCount;
// If we've exceeded our vertex or index buffer size, we need to reset from the beginning.
if ((_vertexBufferByteOffset + byteCount) >= vertexBuffer.SizeInBytes)
{
_indexStart = 0;
_vertexBufferByteOffset = 0;
_vertexBufferIndex = 0;
_indexBufferBaseVertexIndex = 0;
}
CopyMode copyMode = _vertexBufferByteOffset == 0 ? CopyMode.Discard : CopyMode.NoOverwrite;
// Copy a chunk of the cache.
vertexBuffer.SetData(_vertexCache, cacheIndex, vertexCount, _vertexBufferByteOffset, copyMode);
drawCall.VertexStartIndex = _vertexBufferIndex;
drawCall.VertexCount = vertexCount;
Graphics.Submit(drawCall);
// Move to the next block of bytes to render.
_vertexBufferByteOffset += byteCount;
_vertexBufferIndex += vertexCount;
_allocatedVertexCount -= vertexCount;
_indexBufferBaseVertexIndex += vertexCount;
cacheIndex += vertexCount;
}
// Invalidate the cache.
_currentVertexIndex = 0;
_allocatedVertexCount = 0;
_indexCount = 0;
}
/// <summary>
/// Function to initialize the application.
/// </summary>
/// <returns>The main window.</returns>
private static FormMain Initialize()
{
// Create our form and center on the primary monitor.
FormMain window = GorgonExample.Initialize(new DX.Size2(1280, 800), "Gorgon MiniTri");
try
{
// First we create and enumerate the list of video devices installed in the computer.
// We must do this in order to tell Gorgon which video device we intend to use. Note that this method may be quite slow (particularly when running DEBUG versions of
// Direct 3D). To counter this, this object and its Enumerate method are thread safe so this can be run in the background while keeping the main UI responsive.
// Find out which devices we have installed in the system.
// If no suitable device was found (no Direct 3D 12.0 support) in the computer, this method will throw an exception. However, if it succeeds, then the devices object
// will be populated with the IGorgonVideoDeviceInfo for each video device in the system.
//
// Using this method, we could also enumerate the software rasterizer. These devices are typically used to determine if there's a driver error, and can be terribly slow to render
// It is recommended that these only be used in diagnostic scenarios only.
IReadOnlyList <IGorgonVideoAdapterInfo> deviceList = GorgonGraphics.EnumerateAdapters();
if (deviceList.Count == 0)
{
throw new
NotSupportedException("There are no suitable video adapters available in the system. This example is unable to continue and will now exit.");
}
// Now we create the main graphics interface with the first applicable video device.
_graphics = new GorgonGraphics(deviceList[0]);
// Check to ensure that we can support the format required for our swap chain.
// If a video device can't support this format, then the odds are good it won't render anything. Since we're asking for a very common display format, this will
// succeed nearly 100% of the time (unless you've somehow gotten an ancient video device to work with Direct 3D 11.1). Regardless, it's good form to the check for a
// working display format prior to setting up the swap chain.
//
// This method is also used to determine if a format can be used for other objects (e.g. a texture, render target, etc...) Like the swap chain format, this is also a
// best practice to check if the object you're creating supports the desired format.
if ((_graphics.FormatSupport[BufferFormat.R8G8B8A8_UNorm].FormatSupport & BufferFormatSupport.Display) != BufferFormatSupport.Display)
{
// We should never see this unless you've performed some form of black magic.
GorgonDialogs.ErrorBox(window, "We should not see this error.");
return(window);
}
// Finally, create a swap chain to display our output.
// In this case we're setting up our swap chain to bind with our main window, and we use its client size to determine the width/height of the swap chain back buffers.
// This width/height does not need to be the same size as the window, but, except for some scenarios, that would produce undesirable image quality.
_swap = new GorgonSwapChain(_graphics,
window,
new GorgonSwapChainInfo("Main Swap Chain")
{
Format = BufferFormat.R8G8B8A8_UNorm,
Width = window.ClientSize.Width,
Height = window.ClientSize.Height
})
{
DoNotAutoResizeBackBuffer = true
};
// Create the shaders used to render the triangle.
// These shaders provide transformation and coloring for the output pixel data.
CreateShaders();
// Set up our input layout.
//
// We'll be using this to describe to Direct 3D how the elements of a vertex is laid out in memory.
// In order to provide synchronization between the layout on the CPU side and the GPU side, we have to pass the vertex shader because it will contain the vertex
// layout to match with our C# input layout.
_inputLayout = GorgonInputLayout.CreateUsingType <MiniTriVertex>(_graphics, _vertexShader);
// Set up the triangle vertices.
CreateVertexBuffer();
// Set up the constant buffer.
//
// This is used (but could be used for more) to transform the vertex data from 3D space into 2D space.
CreateConstantBuffer(window);
// This defines where to send the pixel data when rendering. For now, this goes to our swap chain.
_graphics.SetRenderTarget(_swap.RenderTargetView);
// Create our draw call.
//
// This will pass all the necessary information to the GPU to render the triangle
//
// Since draw calls are immutable objects, we use builders to create them (and any pipeline state). Once a draw
// call is built, it cannot be changed (except for the vertex, and if applicable, index, and instance ranges).
//
// Builders work on a fluent interface. Much like LINQ and can be used to create multiple draw calls from the same
// builder.
var drawCallBuilder = new GorgonDrawCallBuilder();
var pipelineStateBuilder = new GorgonPipelineStateBuilder(_graphics);
_drawCall = drawCallBuilder.VertexBuffer(_inputLayout, _vertexBuffer)
.VertexRange(0, 3)
.ConstantBuffer(ShaderType.Vertex, _constantBuffer)
.PipelineState(pipelineStateBuilder
.PixelShader(_pixelShader)
.VertexShader(_vertexShader)
.RasterState(GorgonRasterState.NoCulling))
.Build();
GorgonExample.LoadResources(_graphics);
return(window);
}
finally
{
GorgonExample.EndInit();
}
}
/// <summary>
/// Function used to initialize the application.
/// </summary>
private static void Initialize()
{
GorgonExample.ResourceBaseDirectory = new DirectoryInfo(Settings.Default.ResourceLocation);
// Build the form so we can actually show something.
_mainForm = GorgonExample.Initialize(new DX.Size2(1280, 800), "Geometry Shaders");
try
{
// Now we create and enumerate the list of video devices installed in the computer.
// We must do this in order to tell Gorgon which video device we intend to use. Note that this method may be quite slow (particularly when running DEBUG versions of
// Direct 3D). To counter this, this object and its Enumerate method are thread safe so this can be run in the background while keeping the main UI responsive.
//
// If no suitable device was found (no Direct 3D 11.4 support) in the computer, this method will return an empty list. However, if it succeeds, then the devices list
// will be populated with an IGorgonVideoDeviceInfo for each suitable video device in the system.
//
// Using this method, we could also enumerate the WARP software rasterizer, and/of the D3D Reference device (only if the DEBUG functionality provided by the Windows
// SDK is installed). These devices are typically used to determine if there's a driver error, and can be terribly slow to render (reference moreso than WARP). It is
// recommended that these only be used in diagnostic scenarios only.
IReadOnlyList <IGorgonVideoAdapterInfo> devices = GorgonGraphics.EnumerateAdapters(log: GorgonApplication.Log);
if (devices.Count == 0)
{
GorgonDialogs.ErrorBox(_mainForm, "This example requires a video adapter that supports Direct3D 11.4 or better.");
GorgonApplication.Quit();
return;
}
// Now we create the main graphics interface with the first applicable video device.
_graphics = new GorgonGraphics(devices[0], log: GorgonApplication.Log);
// Check to ensure that we can support the format required for our swap chain.
// If a video device can't support this format, then the odds are good it won't render anything. Since we're asking for a very common display format, this will
// succeed nearly 100% of the time. Regardless, it's good form to the check for a working display format prior to setting up the swap chain.
//
// This is also used to determine if a format can be used for other objects (e.g. a texture, render target, etc...) And like the swap chain format, it is also best
// practice to check if the object you're creating supports the desired format.
if (!_graphics.FormatSupport[BufferFormat.R8G8B8A8_UNorm].IsDisplayFormat)
{
// We should never see this unless you've got some very esoteric hardware.
GorgonDialogs.ErrorBox(_mainForm, "We should not see this error.");
return;
}
// Finally, create a swap chain to display our output.
// In this case we're setting up our swap chain to bind with our main window, and we use its client size to determine the width/height of the swap chain back buffers.
// This width/height does not need to be the same size as the window, but, except for some scenarios, that would produce undesirable image quality.
_swap = new GorgonSwapChain(_graphics,
_mainForm,
new GorgonSwapChainInfo("Main Swap Chain")
{
Format = BufferFormat.R8G8B8A8_UNorm, Width = _mainForm.ClientSize.Width, Height = _mainForm.ClientSize.Height
});
// Assign events so we can update our projection with our window size.
_swap.BeforeSwapChainResized += Swap_BeforeSwapChainResized;
_swap.AfterSwapChainResized += Swap_AfterSwapChainResized;
// We'll need a depth buffer for this example, or else our pyramid will look weird when rotating as back faces will appear through front faces.
// So, first we should check for support of a proper depth/stencil format. That said, if we don't have this format, then we're likely not running hardware from the last decade or more.
if (!_graphics.FormatSupport[BufferFormat.D24_UNorm_S8_UInt].IsDepthBufferFormat)
{
GorgonDialogs.ErrorBox(_mainForm, "A 24 bit depth buffer is required for this example.");
return;
}
_depthStencil = GorgonDepthStencil2DView.CreateDepthStencil(_graphics,
new GorgonTexture2DInfo
{
Format = BufferFormat.D24_UNorm_S8_UInt,
Binding = TextureBinding.DepthStencil,
Usage = ResourceUsage.Default,
Width = _swap.Width,
Height = _swap.Height
});
// Load the shaders from a file on disc.
LoadShaders();
// Load the texture.
_texture = GorgonTexture2DView.FromFile(_graphics,
Path.Combine(GorgonExample.GetResourcePath(@"Textures\GeometryShader\").FullName, "GSTexture.png"),
new GorgonCodecPng());
// Create our builders so we can compose a draw call and pipeline state.
_drawCallBuilder = new GorgonDrawCallBuilder();
_pipeStateBuilder = new GorgonPipelineStateBuilder(_graphics);
// Create a constant buffer so we can adjust the positioning of the data.
DX.Matrix.PerspectiveFovLH((65.0f).ToRadians(), (float)_swap.Width / _swap.Height, 0.125f, 1000.0f, out _projection);
_vsConstants = GorgonConstantBufferView.CreateConstantBuffer(_graphics,
new GorgonConstantBufferInfo("WorldProjection CBuffer")
{
SizeInBytes = (DX.Matrix.SizeInBytes * 2) + DX.Vector4.SizeInBytes
});
_vsConstants.Buffer.SetData(ref _projection, copyMode: CopyMode.Discard);
_vsConstants.Buffer.SetData(ref _worldMatrix, 64, CopyMode.NoOverwrite);
// Create a draw call so we actually have something we can draw.
_drawCall = _drawCallBuilder.VertexRange(0, 3)
.PipelineState(_pipeStateBuilder.PixelShader(_pixelShader)
.VertexShader(_bufferless)
.GeometryShader(_geometryShader)
.DepthStencilState(GorgonDepthStencilState.DepthEnabled))
.ShaderResource(ShaderType.Pixel, _texture)
.ConstantBuffer(ShaderType.Vertex, _vsConstants)
.ConstantBuffer(ShaderType.Geometry, _vsConstants)
.Build();
// Finally set our swap chain as the active rendering target and the depth/stencil buffer.
_graphics.SetRenderTarget(_swap.RenderTargetView, _depthStencil);
GorgonExample.LoadResources(_graphics);
}
finally
{
GorgonExample.EndInit();
}
}
