void ReleaseDesignerOutlets()
{
if (BGImage != null)
{
BGImage.Dispose();
BGImage = null;
}
if (BrushPreview != null)
{
BrushPreview.Dispose();
BrushPreview = null;
}
if (BrushSlider != null)
{
BrushSlider.Dispose();
BrushSlider = null;
}
if (Canvas != null)
{
Canvas.Dispose();
Canvas = null;
}
if (ChangeColourButton != null)
{
ChangeColourButton.Dispose();
ChangeColourButton = null;
}
if (Colour1 != null)
{
Colour1.Dispose();
Colour1 = null;
}
if (Colour2 != null)
{
Colour2.Dispose();
Colour2 = null;
}
if (TempCanvas != null)
{
TempCanvas.Dispose();
TempCanvas = null;
}
if (TouchToCanvas != null)
{
TouchToCanvas.Dispose();
TouchToCanvas = null;
}
}
public static void DrawBrushPreview(
PaintContext heightmapPC,
BrushPreview previewTexture,
Texture brushTexture, // brush texture to apply
BrushTransform brushXform, // brush transform that defines the brush UV space
Material proceduralMaterial, // the material to render with (must support procedural quad-mesh generation)
int materialPassIndex) // the pass to use within the material
{
// we want to build a quad mesh, with one vertex for each pixel in the heightmap
// i.e. a 3x3 heightmap would create a mesh that looks like this:
//
// +-+-+
// |\|\|
// +-+-+
// |\|\|
// +-+-+
//
int quadsX = heightmapPC.pixelRect.width - 1;
int quadsY = heightmapPC.pixelRect.height - 1;
int vertexCount = quadsX * quadsY * (2 * 3); // two triangles (2 * 3 vertices) per quad
// issue: the 'int vertexID' in the shader is often stored in an fp32
// which can only represent exact integers up to 16777216 ~== 6 * 1672^2
// once we have more than 16777216 vertices, the vertexIDs start skipping odd values, resulting in missing triangles
// the solution is to reduce vertex count by halving our mesh resolution before we hit that point
const int kMaxFP32Int = 16777216;
int vertSkip = 1;
while (vertexCount > kMaxFP32Int / 2) // in practice we want to stay well below 16 million verts, for perf sanity
{
quadsX = (quadsX + 1) / 2;
quadsY = (quadsY + 1) / 2;
vertexCount = quadsX * quadsY * (2 * 3);
vertSkip *= 2;
}
// this is used to tessellate the quad mesh (from within the vertex shader)
proceduralMaterial.SetVector("_QuadRez", new Vector4(quadsX, quadsY, vertexCount, vertSkip));
// paint context pixels to heightmap uv: uv = (pixels + 0.5) / width
Texture heightmapTexture = (previewTexture == BrushPreview.SourceRenderTexture) ? heightmapPC.sourceRenderTexture : heightmapPC.destinationRenderTexture;
float invWidth = 1.0f / heightmapTexture.width;
float invHeight = 1.0f / heightmapTexture.height;
proceduralMaterial.SetVector("_HeightmapUV_PCPixelsX", new Vector4(invWidth, 0.0f, 0.0f, 0.0f));
proceduralMaterial.SetVector("_HeightmapUV_PCPixelsY", new Vector4(0.0f, invHeight, 0.0f, 0.0f));
proceduralMaterial.SetVector("_HeightmapUV_Offset", new Vector4(0.5f * invWidth, 0.5f * invHeight, 0.0f, 0.0f));
// make sure we point filter the heightmap
FilterMode oldFilter = heightmapTexture.filterMode;
heightmapTexture.filterMode = FilterMode.Point;
proceduralMaterial.SetTexture("_Heightmap", heightmapTexture);
// paint context pixels to object (terrain) position
// objectPos.x = scaleX * pcPixels.x + heightmapRect.xMin * scaleX
// objectPos.y = scaleY * H
// objectPos.z = scaleZ * pcPixels.y + heightmapRect.yMin * scaleZ
float scaleX = heightmapPC.pixelSize.x;
float scaleY = heightmapPC.heightWorldSpaceSize / PaintContext.kNormalizedHeightScale;
float scaleZ = heightmapPC.pixelSize.y;
proceduralMaterial.SetVector("_ObjectPos_PCPixelsX", new Vector4(scaleX, 0.0f, 0.0f, 0.0f));
proceduralMaterial.SetVector("_ObjectPos_HeightMapSample", new Vector4(0.0f, scaleY, 0.0f, 0.0f));
proceduralMaterial.SetVector("_ObjectPos_PCPixelsY", new Vector4(0.0f, 0.0f, scaleZ, 0.0f));
proceduralMaterial.SetVector("_ObjectPos_Offset", new Vector4(heightmapPC.pixelRect.xMin * scaleX, heightmapPC.heightWorldSpaceMin - heightmapPC.originTerrain.GetPosition().y, heightmapPC.pixelRect.yMin * scaleZ, 1.0f));
// heightmap paint context pixels to brush UV
// derivation:
// BrushUV = f(terrainSpace.xz) = f(g(pcPixels.xy))
// f(ts.xy) = ts.x * brushXform.X + ts.y * brushXform.Y + brushXform.Origin
// g(pcPixels.xy) = ts.xz = pcOrigin + pcPixels.xy * pcSize
// f(g(pcPixels.uv)) == (pcOrigin + pcPixels.uv * pcSize).x * brushXform.X + (pcOrigin + pcPixels.uv * pcSize).y * brushXform.Y + brushXform.Origin
// f(g(pcPixels.uv)) == (pcOrigin.x + pcPixels.u * pcSize.x) * brushXform.X + (pcOrigin.y + pcPixels.v * pcSize.y) * brushXform.Y + brushXform.Origin
// f(g(pcPixels.uv)) == (pcOrigin.x * brushXform.X) + (pcPixels.u * pcSize.x) * brushXform.X + (pcOrigin.y * brushXform.Y) + (pcPixels.v * pcSize.y) * brushXform.Y + brushXform.Origin
// f(g(pcPixels.uv)) == pcPixels.u * (pcSize.x * brushXform.X) + pcPixels.v * (pcSize.y * brushXform.Y) + (brushXform.Origin + (pcOrigin.x * brushXform.X) + (pcOrigin.y * brushXform.Y))
// paint context origin in terrain space
// (note this is the UV space origin and size, not the mesh origin & size)
float pcOriginX = heightmapPC.pixelRect.xMin * heightmapPC.pixelSize.x;
float pcOriginZ = heightmapPC.pixelRect.yMin * heightmapPC.pixelSize.y;
float pcSizeX = heightmapPC.pixelSize.x;
float pcSizeZ = heightmapPC.pixelSize.y;
Vector2 scaleU = pcSizeX * brushXform.targetX;
Vector2 scaleV = pcSizeZ * brushXform.targetY;
Vector2 offset = brushXform.targetOrigin + pcOriginX * brushXform.targetX + pcOriginZ * brushXform.targetY;
proceduralMaterial.SetVector("_BrushUV_PCPixelsX", new Vector4(scaleU.x, scaleU.y, 0.0f, 0.0f));
proceduralMaterial.SetVector("_BrushUV_PCPixelsY", new Vector4(scaleV.x, scaleV.y, 0.0f, 0.0f));
proceduralMaterial.SetVector("_BrushUV_Offset", new Vector4(offset.x, offset.y, 0.0f, 1.0f));
proceduralMaterial.SetTexture("_BrushTex", brushTexture);
Vector3 terrainPos = heightmapPC.originTerrain.GetPosition();
proceduralMaterial.SetVector("_TerrainObjectToWorldOffset", terrainPos);
proceduralMaterial.SetPass(materialPassIndex);
Graphics.DrawProceduralNow(MeshTopology.Triangles, vertexCount);
heightmapTexture.filterMode = oldFilter;
}
public static void DrawBrushPreview(
PaintContext heightmapPC,
BrushPreview previewTexture,
Texture brushTexture, // brush texture to apply
BrushTransform brushXform, // brush transform that defines the brush UV space
Material proceduralMaterial, // the material to render with (must support procedural quad-mesh generation)
int materialPassIndex) // the pass to use within the material
{
// we want to build a quad mesh, with one vertex for each pixel in the heightmap
// i.e. a 3x3 heightmap would create a mesh that looks like this:
//
// +-+-+
// |\|\|
// +-+-+
// |\|\|
// +-+-+
//
int quadsX = heightmapPC.pixelRect.width - 1;
int quadsY = heightmapPC.pixelRect.height - 1;
int vertexCount = quadsX * quadsY * (2 * 3); // two triangles (2 * 3 vertices) per quad
// this is used to tessellate the quad mesh (from within the vertex shader)
proceduralMaterial.SetVector("_QuadRez", new Vector4(quadsX, quadsY, vertexCount, 0.0f));
// paint context pixels to heightmap uv: uv = (pixels + 0.5) / width
Texture heightmapTexture = (previewTexture == BrushPreview.SourceRenderTexture) ? heightmapPC.sourceRenderTexture : heightmapPC.destinationRenderTexture;
float invWidth = 1.0f / heightmapTexture.width;
float invHeight = 1.0f / heightmapTexture.height;
proceduralMaterial.SetVector("_HeightmapUV_PCPixelsX", new Vector4(invWidth, 0.0f, 0.0f, 0.0f));
proceduralMaterial.SetVector("_HeightmapUV_PCPixelsY", new Vector4(0.0f, invHeight, 0.0f, 0.0f));
proceduralMaterial.SetVector("_HeightmapUV_Offset", new Vector4(0.5f * invWidth, 0.5f * invHeight, 0.0f, 0.0f));
// make sure we point filter the heightmap
FilterMode oldFilter = heightmapTexture.filterMode;
heightmapTexture.filterMode = FilterMode.Point;
proceduralMaterial.SetTexture("_Heightmap", heightmapTexture);
// paint context pixels to object (terrain) position
// objectPos.x = scaleX * pcPixels.x + heightmapRect.xMin * scaleX
// objectPos.y = scaleY * H
// objectPos.z = scaleZ * pcPixels.y + heightmapRect.yMin * scaleZ
float scaleX = heightmapPC.pixelSize.x;
float scaleY = 2.0f * heightmapPC.originTerrain.terrainData.heightmapScale.y;
float scaleZ = heightmapPC.pixelSize.y;
proceduralMaterial.SetVector("_ObjectPos_PCPixelsX", new Vector4(scaleX, 0.0f, 0.0f, 0.0f));
proceduralMaterial.SetVector("_ObjectPos_HeightMapSample", new Vector4(0.0f, scaleY, 0.0f, 0.0f));
proceduralMaterial.SetVector("_ObjectPos_PCPixelsY", new Vector4(0.0f, 0.0f, scaleZ, 0.0f));
proceduralMaterial.SetVector("_ObjectPos_Offset", new Vector4(heightmapPC.pixelRect.xMin * scaleX, 0.0f, heightmapPC.pixelRect.yMin * scaleZ, 1.0f));
// heightmap paint context pixels to brush UV
// derivation:
// BrushUV = f(terrainSpace.xz) = f(g(pcPixels.xy))
// f(ts.xy) = ts.x * brushXform.X + ts.y * brushXform.Y + brushXform.Origin
// g(pcPixels.xy) = ts.xz = pcOrigin + pcPixels.xy * pcSize
// f(g(pcPixels.uv)) == (pcOrigin + pcPixels.uv * pcSize).x * brushXform.X + (pcOrigin + pcPixels.uv * pcSize).y * brushXform.Y + brushXform.Origin
// f(g(pcPixels.uv)) == (pcOrigin.x + pcPixels.u * pcSize.x) * brushXform.X + (pcOrigin.y + pcPixels.v * pcSize.y) * brushXform.Y + brushXform.Origin
// f(g(pcPixels.uv)) == (pcOrigin.x * brushXform.X) + (pcPixels.u * pcSize.x) * brushXform.X + (pcOrigin.y * brushXform.Y) + (pcPixels.v * pcSize.y) * brushXform.Y + brushXform.Origin
// f(g(pcPixels.uv)) == pcPixels.u * (pcSize.x * brushXform.X) + pcPixels.v * (pcSize.y * brushXform.Y) + (brushXform.Origin + (pcOrigin.x * brushXform.X) + (pcOrigin.y * brushXform.Y))
// paint context origin in terrain space
// (note this is the UV space origin and size, not the mesh origin & size)
float pcOriginX = heightmapPC.pixelRect.xMin * heightmapPC.pixelSize.x;
float pcOriginZ = heightmapPC.pixelRect.yMin * heightmapPC.pixelSize.y;
float pcSizeX = heightmapPC.pixelSize.x;
float pcSizeZ = heightmapPC.pixelSize.y;
Vector2 scaleU = pcSizeX * brushXform.targetX;
Vector2 scaleV = pcSizeZ * brushXform.targetY;
Vector2 offset = brushXform.targetOrigin + pcOriginX * brushXform.targetX + pcOriginZ * brushXform.targetY;
proceduralMaterial.SetVector("_BrushUV_PCPixelsX", new Vector4(scaleU.x, scaleU.y, 0.0f, 0.0f));
proceduralMaterial.SetVector("_BrushUV_PCPixelsY", new Vector4(scaleV.x, scaleV.y, 0.0f, 0.0f));
proceduralMaterial.SetVector("_BrushUV_Offset", new Vector4(offset.x, offset.y, 0.0f, 1.0f));
proceduralMaterial.SetTexture("_BrushTex", brushTexture);
Vector3 terrainPos = heightmapPC.originTerrain.GetPosition();
proceduralMaterial.SetVector("_TerrainObjectToWorldOffset", terrainPos);
proceduralMaterial.SetPass(materialPassIndex);
Graphics.DrawProceduralNow(MeshTopology.Triangles, vertexCount);
heightmapTexture.filterMode = oldFilter;
}
