Commit graph

8 commits

Author SHA1 Message Date
Andrei Alexeyev
52388df53f
improve viewport scaling and positioning 2019-04-04 02:43:03 +03:00
Andrei Alexeyev
1365293334
Some gles20 progress; minor gl refactor and fixes 2018-10-23 10:51:56 +03:00
Andrei Alexeyev
1fd1b6671d
Conditional support for more texture formats in GLES 2018-10-22 10:21:17 +03:00
Andrei Alexeyev
2414474c89
OpenGL ES 3.0 rendering backend (#148)
* First steps towards shader transpilation

Needs to be manually enabled via -Dshader_transpiler=true.

Requires shaderc. https://github.com/google/shaderc

Not yet functional due to missing SPIRV-Cross integration. SPIRV-Cross
currently does not have an official C API, and crossc is too minimal to
be useful. The current plan is to extend crossc and vendor it, while
also sending PRs upstream.

* Integrate crossc; shader transpilation for GLES now works

* fix leak

* gles30 backend now playable on Mesa with 3.2 context

Some rendering issues are present. Identified so far:
    - Marisa's lasers are invisible
    - Death effect looks wrong

Also, a small pixmap manipulation library has been written, and the
texture uploading API redesigned around it.

* fix marisa lasers in GLES (uniform name clashed with builtin)

* fix player death effect in GLES (another name clash)

* Dump ANGLE's translated shader code in debug log

* fix screenshots

* Drop support for triangle fans, switch to strips

Fans offer no advantage over strips, and they've been removed in D3D10+,
so ANGLE has to emulate them.

* crude workaround for an ANGLE bug

* Re-enable GL debug labels, fix an issue with them that affected ANGLE (but was always technically a bug)

* fix race condition in shaderc initialization

* New SDL_RWops interface for vertex buffers

* Optimize VBO streaming via buffering updates

Measurable performance improvement even with the main gl33 renderer,
drastic improvement with ANGLE.

* Fix the depth texture binding problem under ANGLE

Apparently it hates GL_DEPTH_COMPONENT16 for some reason. Sized internal
formats are not supported in GLES 2.0 anyway, so not using them is
probably a good idea.

* fix GLES2.0 segfault (the backend still doesn't work, though)

* dump GL extensions at info log level, not debug

* get around a Mesa bug; more correct texture format table for GLES2

* Correct GLES3 texture format table according to the spec

Not a Mesa bug after all

* require crossc>=1.5.0, fallback to subproject

* Request at least 8bit per color channel in GL backends

* Forbid lto for static windows builds with shader_transpiler=true

* fix edge case segfault

* Add basic ANGLE bundling support to the build system

Windows only, and no NSIS support yet

* Fix various windows-related build system and installer brokenness

* Disable gles backends by default

* update documentation
2018-10-02 01:36:10 +03:00
Andrei Alexeyev
9b3779ebb4
Some renderer refactoring (mostly API and GLES preparations) (#144)
* Refacor uniforms API:

    - More complete and consistent
    - Type-safety
    - Usage correctess assertions missing for now, planned

* Redesign texturing API: texunits gone, assign textures to sampler uniforms directly

r_texture_create now allocates memory and returns an opaque Texture
pointer; similar changes to the other renderer APIs will follow.

* Framebuffers: make _create return an opaque pointer, add debug label APIs (unused for now)

* opaque pointers and debug label APIs for vertex arrays and buffers

* fix null renderer

* Refactor glsl preprocessing into an independent module

* Separate shader resource management from renderer backend

This makes it possible to add more shading languages and/or include a
transpiler, which will be useful for the GLES backend.

* refactor r_clear into a stateless API

* add r_texture_clear API; fix gl33_framebuffer_clear

* Replace deprecated glsl_objects with objects in all *.prog files

* fix missing texture_clear implementation in null renderer

* remove some dead code in null renderer

* fix GLES segfault

* GLES 3.0 actually has glVertexAttribDivisor

* Query GL for supported GLSL versions (preparing to add shader transcompilation)
2018-09-14 10:37:20 +03:00
Andrei Alexeyev
c57d1130aa
support mipmaps and anisotropy (not used until we have premultiplied alpha) 2018-07-11 14:55:08 +03:00
Andrei Alexeyev
5d293393b8
meson woes: prevent internal error if glad is missing (not actually required for build) 2018-07-01 11:47:13 +03:00
Andrei Alexeyev
cc33fdd4fd
Use GLAD to set up GL function pointers 2018-06-30 23:11:54 +03:00