/// <summary>
/// Renders the specified model group on a batch basis.
/// </summary>
private void RenderGroup(ModelGroup modelGroup, Matrix4 modelViewProjection)
{
// Reenable depth test
GL.Enable(EnableCap.DepthTest);
// Render the object
// Send the vertices to the shader
this.VertexBufferLookup[modelGroup].Bind();
this.VertexBufferLookup[modelGroup].EnableAttributes();
this.NormalBufferLookup[modelGroup].Bind();
this.NormalBufferLookup[modelGroup].EnableAttributes();
this.TextureCoordinateBufferLookup[modelGroup].Bind();
this.TextureCoordinateBufferLookup[modelGroup].EnableAttributes();
// Bind the index buffer
this.VertexIndexBufferLookup[modelGroup].Bind();
if (this.ShouldRenderWireframe)
{
this.Shader.Wireframe.SetWireframeColour(EverlookConfiguration.Instance.WireframeColour);
// Override blend setting
GL.Enable(EnableCap.Blend);
}
// Render all the different materials (opaque first, transparent after)
foreach (RenderBatch renderBatch in modelGroup.GetRenderBatches()
.OrderBy(batch => batch.MaterialIndex)
.ThenBy(batch => this.Model.GetMaterial(batch.MaterialIndex).BlendMode))
{
this.Shader.Enable();
ModelMaterial modelMaterial = this.Model.GetMaterial(renderBatch.MaterialIndex);
this.Shader.SetMaterial(modelMaterial);
this.Shader.SetMVPMatrix(modelViewProjection);
// Set the texture as the first diffuse texture in unit 0
Texture2D texture = this.Cache.GetCachedTexture(modelMaterial.Texture0);
if (modelMaterial.Flags.HasFlag(MaterialFlags.TextureWrappingClamp))
{
texture.WrappingMode = TextureWrapMode.Clamp;
}
else
{
texture.WrappingMode = TextureWrapMode.Repeat;
}
this.Shader.BindTexture2D(TextureUnit.Texture0, TextureUniform.Texture0, texture);
// Finally, draw the model
GL.DrawRangeElements
(
PrimitiveType.Triangles,
renderBatch.FirstPolygonIndex,
renderBatch.FirstPolygonIndex + renderBatch.PolygonIndexCount - 1,
renderBatch.PolygonIndexCount,
DrawElementsType.UnsignedShort,
new IntPtr(renderBatch.FirstPolygonIndex * 2)
);
}
// Release the attribute arrays
this.VertexBufferLookup[modelGroup].DisableAttributes();
this.NormalBufferLookup[modelGroup].DisableAttributes();
this.TextureCoordinateBufferLookup[modelGroup].DisableAttributes();
}