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[OpenGL] Basic OpenGL backend #492#495

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archibate wants to merge 53 commits intotaichi-dev:mastertaichi-dev/taichi:masterfrom archibate:openglarchibate/taichi:openglCopy head branch name to clipboard

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Commits on Feb 19, 2020

• [skip ci] basic startup for opengl & working example

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• [skip ci] use a struct_metal style struct compiler

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• [skip ci] basic allocator

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Commits on Feb 20, 2020

• [skip ci] basic read/write tensor

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• adding f32&f64 support for opengl

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• Merge branch 'master' into opengl

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Commits on Feb 21, 2020

• [skip ci] range for using GLSL threads

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• multi work groups & compile before launch to save time

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Commits on Feb 22, 2020

• [skip ci] glsl access external array

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• [skip ci] obsolete SSBO class: no more unnecessary memcpy

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• [skip ci] add [glsl] prefix to all TI_* logs

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• [skip ci] ti.random support for glsl backend

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• [skip ci] add AtomicOpStmt (undone, need barrier to function completely)

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• [skip ci] add n-body example

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• [skip ci] make GLSL more compat

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• [skip ci] use OOish class CompiledKernel

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• [skip ci] OOish OpenglRuntime

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Commits on Feb 23, 2020

• [skip ci] fix typo in GetChStmt: stmt.input_ptr -> stmt

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• merge opengl with master

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• [skip ci] merge opengl with master fix

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• [skip ci] atomicAdd(float, float) -> float += float\nmake alloca zero-initialized\nsave shader source to /tmp/{kernel_name}.comp for debug

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• [skip ci] remove root dir/test_abs.py & enable opengl in test all_archs

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• [skip ci] use big lock for atomic float simulation

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• [skip ci] better atomic float simulation (thanks to @k-ye & @yuanming-hu)

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Commits on Feb 24, 2020

• [skip ci] Performance Optimizations

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• [skip ci] remove evil singleton to restart materialization after reinit

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• [skip ci] glsl simulate floordiv

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• [skip ci] fix typo _thread_id_ '>' to '>='

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• [skip ci] swap while end < begin for const range for

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• [skip ci] multi offload support

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• [skip ci] multi offload shares arg&ext_ptr ssbo

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• [skip ci] add global temp stmt & fix compiled num_threads_ not reset

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• [skip ci] use to UsedFeature class to save 'Too many compute shader storage blocks (13/12)' error

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• Merge branch 'master' into opengl

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Commits on Feb 25, 2020

• [skip ci] Merge branch 'master' into opengl again

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• [skip ci] atomic float support more: global_tmp or extrenal_ptr

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• [skip ci] atomicAdd returns the original content of lhs instead of lhs + rhs

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• [skip ci] glsl raw_mod fixed

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• [skip ci] mark ti.archs_excluding(ti.opengl) in test_types.py (since GL only supports i32, f32, f64)

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• [skip ci] fix test_unary_ops.py for opengl

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• merge opengl with master

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• [skip ci] cmake add GLEW_VERSION

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• [skip ci] merge opengl with master again

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• [skip ci] GLEW not found is FATAL_ERROR

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• [skip ci] atan2 -> atan for glsl

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• [skip ci] disable test_print for opengl

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• [skip ci] add customized ti.approx to partial rel=1e4 for opengl

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• [skip ci] add reinterpret_cast by intBitsToFloat()

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• [skip ci] rcp, rsqrt and bit_not

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• [skip ci] test_internal_func test_types exclude opengl

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• [skip ci] test_offload_with_flexible_bounds exclude opengl

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• [skip ci] test_ad_demote_dense exclude opengl

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• [skip ci] add a lossless version for int // int

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