Platform/GFX/OpenGL Surprises: Difference between revisions
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(Created page with "===Floating-point Renderability=== This is a mess. ====OES_texture_float and OES_texture_half_float==== [https://www.khronos.org/registry/gles/extensions/OES/OES_texture_floa...") |
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==Floating-point Renderability== | |||
This is a mess. | This stuff is a mess. | ||
====OES_texture_float and OES_texture_half_float==== | ====OES_texture_float and OES_texture_half_float==== | ||
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Written against ES'''3'''. It's tempting to think of EXT_color_buffer_float as the float32 equivalent of EXT_color_buffer_half_float, but this is untrue! EXT_color_buffer_float is the ES3 extension that allows both float16 and float32 rendering. | Written against ES'''3'''. It's tempting to think of EXT_color_buffer_float as the float32 equivalent of EXT_color_buffer_half_float, but this is untrue! EXT_color_buffer_float is the ES3 extension that allows both float16 and float32 rendering. | ||
==DrawBuffer== | |||
WebGL1 with the drawbuffer extension allows access to gl_FragData in GLSLES1 shaders, but WebGL2 requires a GLSLES3 shader version in order to use gl_FragData. | WebGL1 with the drawbuffer extension allows access to gl_FragData in GLSLES1 shaders, but WebGL2 requires a GLSLES3 shader version in order to use gl_FragData. | ||
Revision as of 23:54, 19 February 2015
Floating-point Renderability
This stuff is a mess.
OES_texture_float and OES_texture_half_float
(spec document) (both are defined in the same document)
Written against ES2.
Allows specification of textures with a format/type of {RGB,RGBA,LUMINANCE,ALPHA,LUMINANCE_ALPHA}/{FLOAT,HALF_FLOAT_OES}.
Only NEAREST-based filter modes are supported. (OES_texture_[half_]float_linear allows LINEAR filtering)
EXT_color_buffer_half_float
Written against ES2.
EXT_color_buffer_float
Written against ES3. It's tempting to think of EXT_color_buffer_float as the float32 equivalent of EXT_color_buffer_half_float, but this is untrue! EXT_color_buffer_float is the ES3 extension that allows both float16 and float32 rendering.
DrawBuffer
WebGL1 with the drawbuffer extension allows access to gl_FragData in GLSLES1 shaders, but WebGL2 requires a GLSLES3 shader version in order to use gl_FragData.