需要考虑的问题

Shapes

• Convert to meshes based on primitives (ex, using 3DStudio plugins)

Artwork

• Texture, Mip Maps, filtering modes, lighting (in compressed or uncompressed formats)

Animation

• Path description, timing, dynamic changes, rotation (Write shader logic)

Transparency

• Alpha setting
• Alpha blending

Programming the display path

• Display driver interfaces and HW

Performance tuning

• Pipelining
• Compressed textures

Getting the final image to the display

Case 1 (Full ownership mode)

The final image can be directly written to the framebuffer in full screen mode by EGL itset.

Case 2 (Partner mode - work with other applications)

• OpenGL allows reading back the composited image from the gl frame buffer. glReadPixels (xpos, ypos, xwidth, yheight, format, type, dataptr);
• Caveat: This flushes the pipeline.Benchmark for your target app.
• Now the data is in the external application/driver
• Regular alpha blending/compositing operations can be performed on this data.

Application Integration

• Write separate application, directly use EGL for display to frame buffer
• Use application framework like Clutter to build applications. Configure Clutter to use OpenGL ES backend
• Use GTK/QT to manage the Graphics output.

Reference

1. OpenGL ES based UI Development on TI Platforms