mapped etc2 types correctly, fixed ktx with etc2 texture opening issue

kopaka1822 / ImageViewer

HDR, PFM, DDS, KTX, EXR, PNG, JPG, BMP image viewer and manipulator

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mapped etc2 types correctly, fixed ktx with etc2 texture opening issue #34

Closed sssooonnnggg closed 7 months ago

sssooonnnggg commented 7 months ago

references: https://registry.khronos.org/OpenGL-Refpages/es3.1/html/glCompressedTexImage2D.xhtml

FORMAT_RGBA_ETC2_SRGB_BLOCK8 should map to CMP_FORMAT_ETC2_SRGBA1 (block 8) FORMAT_RGBA_ETC2_SRGB_BLOCK16 shoudl map to CMP_FORMAT_ETC2_SRGBA (block 16)

texture for test: etc2.zip

kopaka1822 commented 7 months ago

thank you for the fix!