public void VertexTextureVisualTest()
{
// Implements an extremely simple terrain that reads from a heightmap in the vertex shader.
Game.DrawWith += (sender, e) =>
{
const int heightMapSize = 64;
var heightMapTexture = new Texture2D(Game.GraphicsDevice, heightMapSize, heightMapSize, false, SurfaceFormat.Single);
var heightMapData = new float[heightMapSize * heightMapSize];
for (var y = 0; y < heightMapSize; y++)
{
for (var x = 0; x < heightMapSize; x++)
{
heightMapData[(y * heightMapSize) + x] = (float)Math.Sin(x / 2.0f) + (float)Math.Sin(y / 3.0f);
}
}
heightMapTexture.SetData(heightMapData);
var viewMatrix = Matrix.CreateLookAt(new Vector3(32, 10, 60), new Vector3(32, 0, 30), Vector3.Up);
var projectionMatrix = Matrix.CreatePerspectiveFieldOfView(MathHelper.PiOver4,
Game.GraphicsDevice.Viewport.AspectRatio, 1.0f, 100.0f);
var effect = AssetTestUtility.CompileEffect(Game.GraphicsDevice, "VertexTextureEffect.fx");
effect.Parameters["WorldViewProj"].SetValue(viewMatrix * projectionMatrix);
effect.Parameters["HeightMapTexture"].SetValue(heightMapTexture);
effect.Parameters["HeightMapSize"].SetValue((float)heightMapSize);
effect.CurrentTechnique.Passes[0].Apply();
const int numVertices = heightMapSize * heightMapSize;
var vertexBuffer = new VertexBuffer(Game.GraphicsDevice, typeof(VertexPosition2), numVertices, BufferUsage.WriteOnly);
var vertices = new VertexPosition2[numVertices];
for (var y = 0; y < heightMapSize; y++)
{
for (var x = 0; x < heightMapSize; x++)
{
vertices[(y * heightMapSize) + x] = new VertexPosition2 {
Position = new Vector2(x, y)
}
}
}
;
vertexBuffer.SetData(vertices);
Game.GraphicsDevice.SetVertexBuffer(vertexBuffer);
const int numIndices = (heightMapSize - 1) * (heightMapSize - 1) * 2 * 3;
var indexBuffer = new IndexBuffer(Game.GraphicsDevice, IndexElementSize.SixteenBits, numIndices, BufferUsage.WriteOnly);
var indexData = new short[numIndices];
var indexIndex = 0;
for (short y = 0; y < heightMapSize - 1; y++)
{
for (short x = 0; x < heightMapSize - 1; x++)
{
var baseIndex = (short)((y * heightMapSize) + x);
indexData[indexIndex++] = baseIndex;
indexData[indexIndex++] = (short)(baseIndex + heightMapSize);
indexData[indexIndex++] = (short)(baseIndex + 1);
indexData[indexIndex++] = (short)(baseIndex + 1);
indexData[indexIndex++] = (short)(baseIndex + heightMapSize);
indexData[indexIndex++] = (short)(baseIndex + heightMapSize + 1);
}
}
indexBuffer.SetData(indexData);
Game.GraphicsDevice.Indices = indexBuffer;
Game.GraphicsDevice.RasterizerState = RasterizerState.CullNone;
Game.GraphicsDevice.Clear(Color.CornflowerBlue);
Game.GraphicsDevice.DrawIndexedPrimitives(PrimitiveType.TriangleList,
0, 0, numVertices, 0, numIndices / 3);
};
RunSingleFrameTest();
}
public void VertexTextureVisualTest()
{
// Implements an extremely simple terrain that reads from a heightmap in the vertex shader.
Game.DrawWith += (sender, e) =>
{
const int heightMapSize = 64;
var heightMapTexture = new Texture2D(Game.GraphicsDevice, heightMapSize, heightMapSize, false, SurfaceFormat.Single);
var heightMapData = new float[heightMapSize * heightMapSize];
for (var y = 0; y < heightMapSize; y++)
for (var x = 0; x < heightMapSize; x++)
heightMapData[(y * heightMapSize) + x] = (float) Math.Sin(x / 2.0f) + (float) Math.Sin(y / 3.0f);
heightMapTexture.SetData(heightMapData);
var viewMatrix = Matrix.CreateLookAt(new Vector3(32, 10, 60), new Vector3(32, 0, 30), Vector3.Up);
var projectionMatrix = Matrix.CreatePerspectiveFieldOfView(MathHelper.PiOver4,
Game.GraphicsDevice.Viewport.AspectRatio, 1.0f, 100.0f);
var effect = AssetTestUtility.CompileEffect(Game.GraphicsDevice, "VertexTextureEffect.fx");
effect.Parameters["WorldViewProj"].SetValue(viewMatrix * projectionMatrix);
effect.Parameters["HeightMapTexture"].SetValue(heightMapTexture);
effect.Parameters["HeightMapSize"].SetValue((float) heightMapSize);
effect.CurrentTechnique.Passes[0].Apply();
const int numVertices = heightMapSize * heightMapSize;
var vertexBuffer = new VertexBuffer(Game.GraphicsDevice, typeof(VertexPosition2), numVertices, BufferUsage.WriteOnly);
var vertices = new VertexPosition2[numVertices];
for (var y = 0; y < heightMapSize; y++)
for (var x = 0; x < heightMapSize; x++)
vertices[(y * heightMapSize) + x] = new VertexPosition2 { Position = new Vector2(x, y) };
vertexBuffer.SetData(vertices);
Game.GraphicsDevice.SetVertexBuffer(vertexBuffer);
const int numIndices = (heightMapSize - 1) * (heightMapSize - 1) * 2 * 3;
var indexBuffer = new IndexBuffer(Game.GraphicsDevice, IndexElementSize.SixteenBits, numIndices, BufferUsage.WriteOnly);
var indexData = new short[numIndices];
var indexIndex = 0;
for (short y = 0; y < heightMapSize - 1; y++)
for (short x = 0; x < heightMapSize - 1; x++)
{
var baseIndex = (short) ((y * heightMapSize) + x);
indexData[indexIndex++] = baseIndex;
indexData[indexIndex++] = (short) (baseIndex + heightMapSize);
indexData[indexIndex++] = (short) (baseIndex + 1);
indexData[indexIndex++] = (short) (baseIndex + 1);
indexData[indexIndex++] = (short) (baseIndex + heightMapSize);
indexData[indexIndex++] = (short) (baseIndex + heightMapSize + 1);
}
indexBuffer.SetData(indexData);
Game.GraphicsDevice.Indices = indexBuffer;
Game.GraphicsDevice.RasterizerState = RasterizerState.CullNone;
Game.GraphicsDevice.Clear(Color.CornflowerBlue);
Game.GraphicsDevice.DrawIndexedPrimitives(PrimitiveType.TriangleList,
0, 0, numVertices, 0, numIndices / 3);
};
RunSingleFrameTest();
}
