private void UnloadMeshData(MeshAssetData meshAsset)
{
if (meshAsset.IsLoaded)
{
GL.DeleteVertexArray(meshAsset.VertexArrayObjectHandle);
GL.DeleteBuffer(meshAsset.VertexBufferHandle);
GL.DeleteBuffer(meshAsset.IndicesBufferHandle);
}
}
private void RenderWithBlinn(
MeshAssetData mesh,
ImageAssetData colorTexture,
ImageAssetData normalTexture,
Matrix4 modelMatrix)
{
var modelViewProjection =
modelMatrix *
this.gameData.CameraData.Transformation *
this.gameData.CameraData.PerspectiveProjection;
var shader = this.gameData.BlinnShader;
GL.ActiveTexture(TextureUnit.Texture0);
GL.BindTexture(TextureTarget.Texture2D, colorTexture.OpenGLHandle);
GL.ActiveTexture(TextureUnit.Texture1);
GL.BindTexture(TextureTarget.Texture2D, normalTexture.OpenGLHandle);
GL.BindVertexArray(mesh.VertexArrayObjectHandle);
GL.UseProgram(shader.BasicShader.ProgramHandle);
GL.UniformMatrix4(
shader.BasicShader.ModelviewProjectionMatrixLocation,
false,
ref modelViewProjection);
GL.UniformMatrix4(shader.ModelMatrixLocation, false, ref modelMatrix);
GL.Uniform1(shader.ColorTextureLocation, 0);
GL.Uniform1(shader.NormalTextureLocation, 1);
GL.Uniform1(shader.MaterialShininessLocation, 2.0f);
GL.Uniform3(shader.LightDirectionLocation, this.gameData.AmbientLightDirection);
GL.Uniform4(shader.LightAmbientColorLocation, new Vector4(0.6f, 0.6f, 0.6f, 0));
GL.Uniform4(shader.LightDiffuseColorLocation, new Vector4(0.8f, 0.8f, 0.8f, 0));
GL.Uniform4(shader.LightSpecularColorLocation, new Vector4(0.0f, 0.0f, 0.0f, 0));
GL.Uniform4(shader.CameraPositionLocation, new Vector4(this.gameData.CameraData.Eye, 1));
GL.DrawElements(
PrimitiveType.Triangles,
mesh.IndicesCount,
DrawElementsType.UnsignedInt,
IntPtr.Zero);
GL.BindVertexArray(0);
GL.ActiveTexture(TextureUnit.Texture0);
}
private void LoadMeshAsset(MeshAssetData meshAsset)
{
if (meshAsset.IsLoaded)
{
return;
}
var planeMesh = Wavefront.Load(meshAsset.AssetName);
meshAsset.IndicesCount = planeMesh.Indices.Length;
meshAsset.xMin = planeMesh.xMin;
meshAsset.xMax = planeMesh.xMax;
meshAsset.yMin = planeMesh.yMin;
meshAsset.yMax = planeMesh.yMax;
var xMax = Math.Max(Math.Abs(meshAsset.xMin), Math.Abs(meshAsset.xMax));
var yMax = Math.Max(Math.Abs(meshAsset.yMin), Math.Abs(meshAsset.yMax));
meshAsset.OverallMaximum = Math.Max(xMax, yMax);
// load geometry into gpu memory
int strideCount = 14;
var interleaved = new float[strideCount * planeMesh.Vertices.Length];
var interleavedIndex = 0;
for (int i = 0; i < planeMesh.Vertices.Length; i++)
{
interleavedIndex = i * strideCount;
interleaved[interleavedIndex++] = planeMesh.Vertices[i].X;
interleaved[interleavedIndex++] = planeMesh.Vertices[i].Y;
interleaved[interleavedIndex++] = planeMesh.Vertices[i].Z;
interleaved[interleavedIndex++] = planeMesh.Normals[i].X;
interleaved[interleavedIndex++] = planeMesh.Normals[i].Y;
interleaved[interleavedIndex++] = planeMesh.Normals[i].Z;
interleaved[interleavedIndex++] = planeMesh.UVs[i].X;
interleaved[interleavedIndex++] = planeMesh.UVs[i].Y;
interleaved[interleavedIndex++] = planeMesh.Tangents[i].X;
interleaved[interleavedIndex++] = planeMesh.Tangents[i].Y;
interleaved[interleavedIndex++] = planeMesh.Tangents[i].Z;
interleaved[interleavedIndex++] = planeMesh.BiTangents[i].X;
interleaved[interleavedIndex++] = planeMesh.BiTangents[i].Y;
interleaved[interleavedIndex++] = planeMesh.BiTangents[i].Z;
}
int vertexBufferHandle;
GL.GenBuffers(1, out vertexBufferHandle);
GL.BindBuffer(BufferTarget.ArrayBuffer, vertexBufferHandle);
GL.BufferData(
BufferTarget.ArrayBuffer,
interleaved.Length * sizeof(float),
interleaved,
BufferUsageHint.StaticDraw);
GL.BindBuffer(BufferTarget.ArrayBuffer, 0);
meshAsset.VertexBufferHandle = vertexBufferHandle;
int indexBufferHandle;
GL.GenBuffers(1, out indexBufferHandle);
GL.BindBuffer(BufferTarget.ElementArrayBuffer, indexBufferHandle);
GL.BufferData(
BufferTarget.ElementArrayBuffer,
sizeof(uint) * planeMesh.Indices.Length,
planeMesh.Indices,
BufferUsageHint.StaticDraw);
GL.BindBuffer(BufferTarget.ElementArrayBuffer, 0);
meshAsset.IndicesBufferHandle = indexBufferHandle;
int vertexArrayObjectHandle;
GL.GenVertexArrays(1, out vertexArrayObjectHandle);
GL.BindVertexArray(vertexArrayObjectHandle);
GL.BindBuffer(BufferTarget.ElementArrayBuffer, indexBufferHandle);
GL.BindBuffer(BufferTarget.ArrayBuffer, vertexBufferHandle);
GL.EnableVertexAttribArray(0);
GL.EnableVertexAttribArray(1);
GL.EnableVertexAttribArray(2);
GL.EnableVertexAttribArray(3);
GL.EnableVertexAttribArray(4);
var stride = (4 * Vector3.SizeInBytes) + Vector2.SizeInBytes;
GL.VertexAttribPointer(
VertexAttribIndex.Vertex,
3,
VertexAttribPointerType.Float,
true,
stride,
0);
GL.VertexAttribPointer(
VertexAttribIndex.Normal,
3,
VertexAttribPointerType.Float,
true,
stride,
Vector3.SizeInBytes);
GL.VertexAttribPointer(
VertexAttribIndex.Uv,
2,
VertexAttribPointerType.Float,
true,
stride,
2 * Vector3.SizeInBytes);
GL.VertexAttribPointer(
VertexAttribIndex.Tangent,
3,
VertexAttribPointerType.Float,
true,
stride,
2 * Vector3.SizeInBytes + Vector2.SizeInBytes);
GL.VertexAttribPointer(
VertexAttribIndex.Bitangent,
3,
VertexAttribPointerType.Float,
true,
stride,
3 * Vector3.SizeInBytes + Vector2.SizeInBytes);
GL.BindVertexArray(0);
meshAsset.VertexArrayObjectHandle = vertexArrayObjectHandle;
meshAsset.IsLoaded = true;
}
