Implement Array, Cubemap, and Volume texture types (issue #1111).

- Add love.graphics.newArrayImage, newCubeImage, and newVolumeImage.
- Add love.graphics.newCanvas(w, h, layers) and newCanvas(w, h, layers, settings). Add ‘type’ field to the settings table of newCanvas.

- Add new love.graphics.setCanvas variants: setCanvas(canvas, slice), and setCanvas(canvastable) where canvastable is in the format: {{canvas1, layer=2}, {canvas2, face=5}}

- Add Texture:getTextureType, getDepth, getLayerCount, getMipmapCount, and getFormat.

- Remove Image:getData and Image:refresh.
- Add Image:replacePixels(imagedata [, slice] [, mipmap]).

- Update Canvas:newImageData to accept a slice argument.

- Add love.image.newCubeFaces(imagedata).

--HG--
branch : minor

src/modules/graphics/opengl/Mesh.cpp

@@ -99,6 +99,9 @@ void Mesh::drawInstanced(love::graphics::Graphics *gfx, const love::Matrix4 &m,
 	if (instancecount > 1 && !gl.isInstancingSupported())
 		throw love::Exception("Instancing is not supported on this system.");
 
+	if (Shader::current && texture.get())
+		Shader::current->checkMainTextureType(texture->getTextureType());
+
 	gfx->flushStreamDraws();
 
 	OpenGL::TempDebugGroup debuggroup("Mesh draw");
@@ -131,7 +134,10 @@ void Mesh::drawInstanced(love::graphics::Graphics *gfx, const love::Matrix4 &m,
 
 	gl.useVertexAttribArrays(enabledattribs, instancedattribs);
 
-	gl.bindTextureToUnit(texture, 0, false);
+	if (texture.get())
+		gl.bindTextureToUnit(texture, 0, false);
+	else
+		gl.bindTextureToUnit(TEXTURE_2D, gl.getDefaultTexture(TEXTURE_2D), 0, false);
 
 	Graphics::TempTransform transform(gfx, m);