glwindow: disable fps limit for accurate fps measurement

[hermet]

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[Copilot]

Pull request overview

Updates the OpenGL example window setup to avoid vsync-based frame limiting so FPS output reflects actual render throughput.

Changes:

• Disable SDL swap interval (vsync) for GlWindow via SDL_GL_SetSwapInterval(0).
• Minor formatting-only whitespace change in the GlWindow constructor.

Comments suppressed due to low confidence (2)

src/Example.h:388

• SDL_GL_SetSwapInterval(0) can fail (returns -1) depending on platform/driver; failing silently would defeat the goal of accurate FPS measurement. Please check the return value and log SDL_GetError() (or otherwise surface that vsync couldn’t be disabled).

        window = SDL_CreateWindow("ThorVG Example (OpenGL/ES)", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, width, height, SDL_WINDOW_OPENGL | SDL_WINDOW_HIDDEN | SDL_WINDOW_RESIZABLE);
        context = SDL_GL_CreateContext(window);

        //Create a Canvas

src/Example.h:388

• Disabling the swap interval here is unconditional for all GL runs, which may significantly increase CPU/GPU usage and introduce tearing even when FPS reporting (print) is off. Consider making this conditional on the FPS-measurement mode (e.g., print) and applying it after window->print is configured (before the first SDL_GL_SwapWindow).

        //Create a Canvas

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