GL: Respect minimum UBO alignment requirement (#794)

* GL: Respect minimum UBO alignment requirement

* Use glBindBufferRange for UBOs

* Fix fragment shadergen UBO bindings

* Nit

include/renderer_gl/gl_driver.hpp

@@ -1,4 +1,5 @@
 #pragma once
+#include "opengl.hpp"
 
 // Information about our OpenGL/OpenGL ES driver that we should keep track of
 // Stuff like whether specific extensions are supported, and potentially things like OpenGL context information
@@ -8,6 +9,9 @@ namespace OpenGL {
 		bool supportsExtFbFetch = false;
 		bool supportsArmFbFetch = false;
 
+		// Minimum alignment for UBO offsets. Fetched by the OpenGL renderer using glGetIntegerV.
+		GLuint uboAlignment = 16;
+
 		bool supportFbFetch() const { return supportsExtFbFetch || supportsArmFbFetch; }
 	};
 }  // namespace OpenGL

include/renderer_gl/renderer_gl.hpp

@@ -101,6 +101,9 @@ class RendererGL final : public Renderer {
 	std::unique_ptr<StreamBuffer> hwVertexBuffer;
 	std::unique_ptr<StreamBuffer> hwIndexBuffer;
 
+	// Current offset for our hw shader uniform UBO
+	u32 hwShaderUniformUBOOffset = 0;
+
 	// Cache of fixed attribute values so that we don't do any duplicate updates
 	std::array<std::array<float, 4>, 16> fixedAttrValues;