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[client] egl: switch to using GL_TEXTURE_EXTERNAL_OES for DMABUF
According to Erik @ NVidia the open source NVidia driver will not create a EGLImage from a DMABUF if the target is not GL_TEXTURE_EXTERNAL_OES. This change set converts the dmabuf texture from GL_TEXTURE_2D to GL_TEXTURE_EXTERNAL_OES and at runtime performs a global search & replace on fragment shaders as needed to remain compatible, replacing `sampler2D` with `samplerExternalOES`. Ref: https://github.com/NVIDIA/open-gpu-kernel-modules/discussions/243#discussioncomment-3283415
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@@ -41,7 +41,7 @@ bool egl_postProcessConfigModified(EGL_PostProcess * this);
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* targetX/Y is the final target output dimension hint if scalers are present */
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bool egl_postProcessRun(EGL_PostProcess * this, EGL_Texture * tex,
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EGL_DesktopRects * rects, int desktopWidth, int desktopHeight,
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unsigned int targetX, unsigned int targetY);
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unsigned int targetX, unsigned int targetY, bool useDMA);
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GLuint egl_postProcessGetOutput(EGL_PostProcess * this,
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EGL_Texture * egl_postProcessGetOutput(EGL_PostProcess * this,
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unsigned int * outputX, unsigned int * outputY);
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