/// <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)
{
Vector2 targetSize = state.DrawTarget.Size;
state.PushRenderState();
state.RenderState.AlphaBlend = blendMode;
state.RenderState.DepthColourCull.DepthWriteEnabled = false;
//get the shared vertice
VelocityLineParticles2DElement.GenerateLinesVertices(state, ref vertices);
int count = (int)particleCount;
DrawVelocityParticles_LinesGpuTex shaderNoColour = null;
DrawVelocityParticlesColour_LinesGpuTex shaderColour = null;
//user variants
DrawVelocityParticles_LinesGpuTex_UserOffset shaderNoColour_UO = null;
DrawVelocityParticlesColour_LinesGpuTex_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_LinesGpuTex>();
shaderColour.PositionTexture = positionTex;
shaderColour.ColourTexture = colourTex;
shaderColour.VelocityTexture = velocityRotation;
shaderColour.SetVelocityScale(ref velScale);
}
else
{
shader = shaderNoColour = state.GetShader <DrawVelocityParticles_LinesGpuTex>();
shaderNoColour.PositionTexture = positionTex;
shaderNoColour.VelocityTexture = velocityRotation;
shaderNoColour.SetVelocityScale(ref velScale);
}
}
else
{
if (colourTex != null)
{
shader = shaderColour_UO = state.GetShader <DrawVelocityParticlesColour_LinesGpuTex_UserOffset>();
shaderColour_UO.PositionTexture = positionTex;
shaderColour_UO.ColourTexture = colourTex;
shaderColour_UO.VelocityTexture = velocityRotation;
shaderColour_UO.SetVelocityScale(ref velScale);
}
else
{
shader = shaderNoColour_UO = state.GetShader <DrawVelocityParticles_LinesGpuTex_UserOffset>();
shaderNoColour_UO.PositionTexture = positionTex;
shaderNoColour_UO.VelocityTexture = velocityRotation;
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, null, PrimitiveType.LineList, drawCount, 0, 0);
count -= drawCount;
drawn += drawCount;
}
state.PopRenderState();
}
/// <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)
{
Vector2 targetSize = state.DrawTarget.Size;
state.PushRenderState();
state.RenderState.AlphaBlend = blendMode;
state.RenderState.DepthColourCull.DepthWriteEnabled = false;
VelocityLineParticles2DElement.GenerateLinesVertices(state, ref this.vertices);
int count = (int)particleCount;
DrawVelocityParticles_LinesCpu shaderNoColour = null;
DrawVelocityParticlesColour_LinesCpu shaderColour = null;
if (colourData != null)
{
shaderColour = state.GetShader <DrawVelocityParticlesColour_LinesCpu>();
}
else
{
shaderNoColour = state.GetShader <DrawVelocityParticles_LinesCpu>();
}
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.SetVelocityScale(ref velScale);
shaderColour.Bind(state);
}
else
{
shaderNoColour.PositionData.SetArray(positionSize, drawn);
shaderNoColour.VelocityData.SetArray(velocityRotation, drawn);
shaderNoColour.SetVelocityScale(ref velScale);
shaderNoColour.Bind(state);
}
vertices.Draw(state, null, PrimitiveType.LineList, drawCount, 0, 0);
count -= drawCount;
drawn += drawCount;
}
state.PopRenderState();
}