/// <summary>
/// Function to blit the texture to the specified render target.
/// </summary>
/// <param name="texture">The texture that will be blitted to the render target.</param>
/// <param name="destRect">The layout area to blit the texture into.</param>
/// <param name="sourceOffset">The offset within the source texture to start blitting from.</param>
/// <param name="color">The color used to tint the diffuse value of the texture.</param>
/// <param name="clip"><b>true</b> to clip the contents of the texture if the destination is larger/small than the size of the texture.</param>
/// <param name="blendState">The blending state to apply.</param>
/// <param name="samplerState">The sampler state to apply.</param>
/// <param name="pixelShader">The pixel shader used to override the default pixel shader.</param>
/// <param name="pixelShaderConstants">The pixel shader constant buffers to use.</param>
public void Blit(GorgonTexture2DView texture,
DX.Rectangle destRect,
DX.Point sourceOffset,
GorgonColor color,
bool clip,
GorgonBlendState blendState,
GorgonSamplerState samplerState,
GorgonPixelShader pixelShader,
GorgonConstantBuffers pixelShaderConstants)
{
if ((_graphics.RenderTargets[0] == null) ||
(color.Alpha.EqualsEpsilon(0)))
{
return;
}
if (texture == null)
{
texture = _defaultTexture;
}
GorgonRenderTargetView currentView = _graphics.RenderTargets[0];
// We need to update the projection/view if the size of the target changes.
if ((_targetBounds == null) ||
(currentView.Width != _targetBounds.Value.Width) ||
(currentView.Height != _targetBounds.Value.Height))
{
_needsWvpUpdate = true;
}
UpdateProjection();
// Set to default states if not provided.
if (blendState == null)
{
blendState = GorgonBlendState.NoBlending;
}
if (pixelShader == null)
{
pixelShader = _pixelShader;
}
if (samplerState == null)
{
samplerState = GorgonSamplerState.Default;
}
if (pixelShaderConstants == null)
{
pixelShaderConstants = _emptyPsConstants;
}
GetDrawCall(texture, blendState, samplerState, pixelShader, pixelShaderConstants);
// Calculate position on the texture.
DX.Vector2 topLeft = texture.Texture.ToTexel(sourceOffset);
DX.Vector2 bottomRight = texture.Texture.ToTexel(clip ? new DX.Vector2(destRect.Width, destRect.Height) : new DX.Point(texture.Width, texture.Height));
if (clip)
{
DX.Vector2.Add(ref bottomRight, ref topLeft, out bottomRight);
}
// Update the vertices.
_vertices[0] = new BltVertex
{
Position = new DX.Vector4(destRect.X, destRect.Y, 0, 1.0f),
Uv = topLeft,
Color = color
};
_vertices[1] = new BltVertex
{
Position = new DX.Vector4(destRect.Right, destRect.Y, 0, 1.0f),
Uv = new DX.Vector2(bottomRight.X, topLeft.Y),
Color = color
};
_vertices[2] = new BltVertex
{
Position = new DX.Vector4(destRect.X, destRect.Bottom, 0, 1.0f),
Uv = new DX.Vector2(topLeft.X, bottomRight.Y),
Color = color
};
_vertices[3] = new BltVertex
{
Position = new DX.Vector4(destRect.Right, destRect.Bottom, 0, 1.0f),
Uv = new DX.Vector2(bottomRight.X, bottomRight.Y),
Color = color
};
// Copy to the vertex buffer.
_vertexBufferBindings[0].VertexBuffer.SetData(_vertices);
_graphics.Submit(_drawCall);
}
/// <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);
}