Selectable renderer implementation (#1247)

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

src/mbgl/gl/context.cpp

@@ -3,26 +3,29 @@
 #include <mbgl/gfx/shader_registry.hpp>
 #include <mbgl/gl/command_encoder.hpp>
 #include <mbgl/gl/defines.hpp>
-#include <mbgl/gl/drawable_gl.hpp>
-#include <mbgl/gl/drawable_gl_builder.hpp>
-#include <mbgl/gl/drawable_gl_tweaker.hpp>
 #include <mbgl/gl/draw_scope_resource.hpp>
 #include <mbgl/gl/enum.hpp>
-#include <mbgl/gl/layer_group_gl.hpp>
 #include <mbgl/gl/renderer_backend.hpp>
 #include <mbgl/gl/renderbuffer_resource.hpp>
-#include <mbgl/gl/uniform_buffer_gl.hpp>
 #include <mbgl/gl/texture_resource.hpp>
 #include <mbgl/gl/texture.hpp>
-#include <mbgl/gl/texture2d.hpp>
 #include <mbgl/gl/offscreen_texture.hpp>
 #include <mbgl/gl/debugging_extension.hpp>
 #include <mbgl/renderer/paint_parameters.hpp>
-#include <mbgl/shaders/gl/shader_program_gl.hpp>
 #include <mbgl/util/traits.hpp>
 #include <mbgl/util/std.hpp>
 #include <mbgl/util/logging.hpp>
 
+#if MLN_DRAWABLE_RENDERER
+#include <mbgl/gl/drawable_gl.hpp>
+#include <mbgl/gl/drawable_gl_builder.hpp>
+#include <mbgl/gl/drawable_gl_tweaker.hpp>
+#include <mbgl/gl/layer_group_gl.hpp>
+#include <mbgl/gl/uniform_buffer_gl.hpp>
+#include <mbgl/gl/texture2d.hpp>
+#include <mbgl/shaders/gl/shader_program_gl.hpp>
+#endif
+
 #include <cstring>
 #include <iterator>
 
@@ -455,6 +458,7 @@ void Context::setDirtyState() {
     globalVertexArrayState.setDirty();
 }
 
+#if MLN_DRAWABLE_RENDERER
 gfx::UniqueDrawableBuilder Context::createDrawableBuilder(std::string name) {
     return std::make_unique<gl::DrawableGLBuilder>(std::move(name));
 }
@@ -484,6 +488,7 @@ LayerGroupPtr Context::createLayerGroup(int32_t layerIndex, std::size_t initialC
 gfx::Texture2DPtr Context::createTexture2D() {
     return std::make_shared<gl::Texture2D>(*this);
 }
+#endif
 
 void Context::clear(std::optional<mbgl::Color> color, std::optional<float> depth, std::optional<int32_t> stencil) {
     GLbitfield mask = 0;