/// <summary>
/// draws the particles on a GPU system
/// </summary>
protected override void DrawGpuParticles(DrawState state, Content.ParticleSystemTypeData particleType, uint particleCount, AlphaBlendState blendMode, Texture2D positionTex, Texture2D velocityRotation, Texture2D colourTex, Texture2D userValues, bool usesUserValuesPositionBuffer)
{
//this is very similar to the billboard drawer (see it for reference)
Vector2 targetSize = state.DrawTarget.Size;
state.PushRenderState();
state.RenderState.AlphaBlend = blendMode;
state.RenderState.DepthColourCull.DepthWriteEnabled = false;
Texture2D displayTexture = particleType.Texture ?? Xen.Ex.Material.WhiteTexture.GetTexture(state);
//get the shared vertice
BillboardParticles2DElement.GenerateBillboardVertices(state, ref vertices, ref indices);
int count = (int)particleCount;
DrawVelocityParticles_GpuTex shaderNoColour = null;
DrawVelocityParticlesColour_GpuTex shaderColour = null;
//user variants
DrawVelocityParticles_GpuTex_UserOffset shaderNoColour_UO = null;
DrawVelocityParticlesColour_GpuTex_UserOffset shaderColour_UO = null;
float resolutionXF = (float)positionTex.Width;
float resolutionYF = (float)positionTex.Height;
Vector2 invTextureSize;
Vector2 velScale = new Vector2(velocityScale, 0);
if (this.useRotationToScaleVelocityEffect)
{
velScale = new Vector2(0, velocityScale);
}
invTextureSize = new Vector2(1.0f / resolutionXF, 1.0f / resolutionYF);
IShader shader;
if (!usesUserValuesPositionBuffer)
{
if (colourTex != null)
{
shader = shaderColour = state.GetShader <DrawVelocityParticlesColour_GpuTex>();
shaderColour.PositionTexture = positionTex;
shaderColour.ColourTexture = colourTex;
shaderColour.VelocityTexture = velocityRotation;
shaderColour.DisplayTexture = displayTexture;
shaderColour.SetVelocityScale(ref velScale);
}
else
{
shader = shaderNoColour = state.GetShader <DrawVelocityParticles_GpuTex>();
shaderNoColour.PositionTexture = positionTex;
shaderNoColour.VelocityTexture = velocityRotation;
shaderNoColour.DisplayTexture = displayTexture;
shaderNoColour.SetVelocityScale(ref velScale);
}
}
else
{
if (colourTex != null)
{
shader = shaderColour_UO = state.GetShader <DrawVelocityParticlesColour_GpuTex_UserOffset>();
shaderColour_UO.PositionTexture = positionTex;
shaderColour_UO.ColourTexture = colourTex;
shaderColour_UO.VelocityTexture = velocityRotation;
shaderColour_UO.UserTexture = userValues;
shaderColour_UO.DisplayTexture = displayTexture;
shaderColour_UO.SetVelocityScale(ref velScale);
}
else
{
shader = shaderNoColour_UO = state.GetShader <DrawVelocityParticles_GpuTex_UserOffset>();
shaderNoColour_UO.PositionTexture = positionTex;
shaderNoColour_UO.VelocityTexture = velocityRotation;
shaderNoColour_UO.UserTexture = userValues;
shaderNoColour_UO.DisplayTexture = displayTexture;
shaderNoColour_UO.SetVelocityScale(ref velScale);
}
}
int drawn = 0;
while (count > 0)
{
int drawCount = Math.Min(count, vertices.Count / 4);
if (!usesUserValuesPositionBuffer)
{
if (colourTex != null)
{
shaderColour.TextureSizeOffset = new Vector3(invTextureSize, (float)drawn);
}
else
{
shaderNoColour.TextureSizeOffset = new Vector3(invTextureSize, (float)drawn);
}
}
else
{
if (colourTex != null)
{
shaderColour_UO.TextureSizeOffset = new Vector3(invTextureSize, (float)drawn);
}
else
{
shaderNoColour_UO.TextureSizeOffset = new Vector3(invTextureSize, (float)drawn);
}
}
//bind
shader.Bind(state);
vertices.Draw(state, indices, PrimitiveType.TriangleList, drawCount * 2, 0, 0);
count -= drawCount;
drawn += drawCount;
}
state.PopRenderState();
}
/// <summary>
/// implements the method to draw gpu particles
/// </summary>
protected override void DrawGpuParticles(DrawState state, Content.ParticleSystemTypeData particleType, uint particleCount, AlphaBlendState blendMode, Texture2D positionTex, Texture2D velocityRotation, Texture2D colourTex, Texture2D userValues, bool usesUserValuesPositionBuffer)
{
Vector2 targetSize = state.DrawTarget.Size;
state.PushRenderState();
state.RenderState.AlphaBlend = blendMode;
state.RenderState.DepthColourCull.DepthWriteEnabled = false;
//get the display texture, or a white texture if none exists
Texture2D displayTexture = particleType.Texture ?? Xen.Ex.Material.WhiteTexture.GetTexture(state);
//get / create the shared vertices and indices for drawing billboard particles
BillboardParticles2DElement.GenerateBillboardVertices(state, ref vertices, ref indices);
int count = (int)particleCount;
//instances of the two possible shaders
DrawVelocityBillboardParticles_GpuTex3D shaderNoColour = null;
DrawVelocityBillboardParticlesColour_GpuTex3D shaderColour = null;
//user variantes
DrawVelocityBillboardParticles_GpuTex3D_UserOffset shaderNoColour_UO = null;
DrawVelocityBillboardParticlesColour_GpuTex3D_UserOffset shaderColour_UO = null;
float resolutionXF = (float)positionTex.Width;
float resolutionYF = (float)positionTex.Height;
Vector2 invTextureSize = new Vector2(1.0f / resolutionXF, 1.0f / resolutionYF);
Matrix cameraMatrix;
state.Camera.GetCameraMatrix(out cameraMatrix);
Vector3 worldSpaceYAxis = new Vector3(cameraMatrix.M21, cameraMatrix.M22, cameraMatrix.M23);
Vector2 velScale = new Vector2(velocityScale, 0);
if (this.useRotationToScaleVelocityEffect)
{
velScale = new Vector2(0, velocityScale);
}
IShader shader;
if (!usesUserValuesPositionBuffer)
{
if (colourTex != null) // does this particle system use colours?
{
//get the shader
shaderColour = state.GetShader <DrawVelocityBillboardParticlesColour_GpuTex3D>();
//set the samplers
shaderColour.PositionTexture = positionTex;
shaderColour.ColourTexture = colourTex;
shaderColour.VelocityTexture = velocityRotation;
shaderColour.DisplayTexture = displayTexture;
shaderColour.SetWorldSpaceYAxis(ref worldSpaceYAxis);
shaderColour.SetVelocityScale(ref velScale);
shader = shaderColour;
}
else
{
shaderNoColour = state.GetShader <DrawVelocityBillboardParticles_GpuTex3D>();
shaderNoColour.PositionTexture = positionTex;
shaderNoColour.VelocityTexture = velocityRotation;
shaderNoColour.DisplayTexture = displayTexture;
shaderNoColour.SetWorldSpaceYAxis(ref worldSpaceYAxis);
shaderNoColour.SetVelocityScale(ref velScale);
shader = shaderNoColour;
}
}
else
{
if (colourTex != null) // does this particle system use colours?
{
//get the shader
shaderColour_UO = state.GetShader <DrawVelocityBillboardParticlesColour_GpuTex3D_UserOffset>();
//set the samplers
shaderColour_UO.PositionTexture = positionTex;
shaderColour_UO.ColourTexture = colourTex;
shaderColour_UO.VelocityTexture = velocityRotation;
shaderColour_UO.UserTexture = userValues;
shaderColour_UO.DisplayTexture = displayTexture;
shaderColour_UO.SetWorldSpaceYAxis(ref worldSpaceYAxis);
shaderColour_UO.SetVelocityScale(ref velScale);
shader = shaderColour_UO;
}
else
{
shaderNoColour_UO = state.GetShader <DrawVelocityBillboardParticles_GpuTex3D_UserOffset>();
shaderNoColour_UO.PositionTexture = positionTex;
shaderNoColour_UO.VelocityTexture = velocityRotation;
shaderNoColour_UO.UserTexture = userValues;
shaderNoColour_UO.DisplayTexture = displayTexture;
shaderNoColour_UO.SetWorldSpaceYAxis(ref worldSpaceYAxis);
shaderNoColour_UO.SetVelocityScale(ref velScale);
shader = shaderNoColour_UO;
}
}
int drawn = 0;
while (count > 0)
{
//draw upto vertices.Count / 4 (4 vertices per quad)
int drawCount = Math.Min(count, vertices.Count / 4);
//set the inverse texture size, and the start offset value, then bind the shader
if (!usesUserValuesPositionBuffer)
{
if (colourTex != null)
{
shaderColour.InvTextureSizeOffset = new Vector3(invTextureSize, (float)drawn);
}
else
{
shaderNoColour.InvTextureSizeOffset = new Vector3(invTextureSize, (float)drawn);
}
}
else
{
if (colourTex != null)
{
shaderColour_UO.InvTextureSizeOffset = new Vector3(invTextureSize, (float)drawn);
}
else
{
shaderNoColour_UO.InvTextureSizeOffset = new Vector3(invTextureSize, (float)drawn);
}
}
//bind
shader.Bind(state);
//draw!
vertices.Draw(state, indices, PrimitiveType.TriangleList, drawCount * 2, 0, 0);
count -= drawCount;
drawn += drawCount;
}
//and done.
state.PopRenderState();
}
//draws on CPU particle systems
/// <summary>
/// draws the particles from a CPU system
/// </summary>
protected override void DrawCpuParticles(DrawState state, Content.ParticleSystemTypeData particleType, uint particleCount, AlphaBlendState blendMode, Vector4[] positionSize, Vector4[] velocityRotation, Vector4[] colourData, Vector4[] userValues)
{
//this is very similar to the billboard drawer (see it for reference)
Vector2 targetSize = state.DrawTarget.Size;
state.PushRenderState();
state.RenderState.AlphaBlend = blendMode;
state.RenderState.DepthColourCull.DepthWriteEnabled = false;
Texture2D displayTexture = particleType.Texture ?? Xen.Ex.Material.WhiteTexture.GetTexture(state);
BillboardParticles2DElement.GenerateBillboardVertices(state, ref this.vertices, ref this.indices);
int count = (int)particleCount;
DrawVelocityParticles_BillboardCpu shaderNoColour = null;
DrawVelocityParticlesColour_BillboardCpu shaderColour = null;
if (colourData != null)
{
shaderColour = state.GetShader <DrawVelocityParticlesColour_BillboardCpu>();
}
else
{
shaderNoColour = state.GetShader <DrawVelocityParticles_BillboardCpu>();
}
Vector2 velScale = new Vector2(velocityScale, 0);
if (this.useRotationToScaleVelocityEffect)
{
velScale = new Vector2(0, velocityScale);
}
int drawn = 0;
while (count > 0)
{
int drawCount;
drawCount = Math.Min(count, 80);
if (colourData != null)
{
shaderColour.PositionData.SetArray(positionSize, drawn);
shaderColour.VelocityData.SetArray(velocityRotation, drawn);
shaderColour.ColourData.SetArray(colourData, drawn);
shaderColour.DisplayTexture = displayTexture;
shaderColour.SetVelocityScale(ref velScale);
shaderColour.Bind(state);
}
else
{
shaderNoColour.PositionData.SetArray(positionSize, drawn);
shaderNoColour.VelocityData.SetArray(velocityRotation, drawn);
shaderNoColour.DisplayTexture = displayTexture;
shaderNoColour.SetVelocityScale(ref velScale);
shaderNoColour.Bind(state);
}
vertices.Draw(state, indices, PrimitiveType.TriangleList, drawCount * 2, 0, 0);
count -= drawCount;
drawn += drawCount;
}
state.PopRenderState();
}
/// <summary>
/// implements the method to draw cpu processed particles
/// </summary>
protected override void DrawCpuParticles(DrawState state, Content.ParticleSystemTypeData particleType, uint particleCount, AlphaBlendState blendMode, Vector4[] positionSize, Vector4[] velocityRotation, Vector4[] colourData, Vector4[] userValues)
{
//this is a bit more complex, but mostly the same as the GPU draw method
Vector2 targetSize = state.DrawTarget.Size;
state.PushRenderState();
state.RenderState.AlphaBlend = blendMode;
state.RenderState.DepthColourCull.DepthWriteEnabled = false;
Texture2D displayTexture = particleType.Texture ?? Xen.Ex.Material.WhiteTexture.GetTexture(state);
BillboardParticles2DElement.GenerateBillboardVertices(state, ref this.vertices, ref this.indices);
Matrix cameraMatrix;
state.Camera.GetCameraMatrix(out cameraMatrix);
Vector3 worldSpaceYAxis = new Vector3(cameraMatrix.M21, cameraMatrix.M22, cameraMatrix.M23);
Vector2 velScale = new Vector2(velocityScale, 0);
if (this.useRotationToScaleVelocityEffect)
{
velScale = new Vector2(0, velocityScale);
}
int count = (int)particleCount;
DrawVelocityBillboardParticles_BillboardCpu3D shaderNoColour = null;
DrawVelocityBillboardParticlesColour_BillboardCpu3D shaderColour = null;
if (colourData != null)
{
shaderColour = state.GetShader <DrawVelocityBillboardParticlesColour_BillboardCpu3D>();
shaderColour.SetWorldSpaceYAxis(ref worldSpaceYAxis);
shaderColour.SetVelocityScale(ref velScale);
}
else
{
shaderNoColour = state.GetShader <DrawVelocityBillboardParticles_BillboardCpu3D>();
shaderNoColour.SetWorldSpaceYAxis(ref worldSpaceYAxis);
shaderNoColour.SetVelocityScale(ref velScale);
}
int drawn = 0;
while (count > 0)
{
int drawCount;
drawCount = Math.Min(count, 75);
if (colourData != null)
{
shaderColour.PositionData.SetArray(positionSize, drawn);
shaderColour.VelocityData.SetArray(velocityRotation, drawn);
shaderColour.ColourData.SetArray(colourData, drawn);
shaderColour.DisplayTexture = displayTexture;
shaderColour.Bind(state);
}
else
{
shaderNoColour.PositionData.SetArray(positionSize, drawn);
shaderNoColour.VelocityData.SetArray(velocityRotation, drawn);
shaderNoColour.DisplayTexture = displayTexture;
shaderNoColour.Bind(state);
}
vertices.Draw(state, indices, PrimitiveType.TriangleList, drawCount * 2, 0, 0);
count -= drawCount;
drawn += drawCount;
}
state.PopRenderState();
}
