mirror of
https://github.com/kovidgoyal/kitty
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268 lines
10 KiB
Python
268 lines
10 KiB
Python
#!/usr/bin/env python
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# vim:fileencoding=utf-8
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# License: GPL v3 Copyright: 2016, Kovid Goyal <kovid at kovidgoyal.net>
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import sys
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from ctypes import addressof, sizeof
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from functools import lru_cache
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from threading import Lock
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from .fonts.render import render_cell
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from .fast_data_types import (
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glCreateProgram, glAttachShader, GL_FRAGMENT_SHADER, GL_VERTEX_SHADER,
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glLinkProgram, GL_TRUE, GL_LINK_STATUS, glGetProgramiv,
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glGetProgramInfoLog, glDeleteShader, glDeleteProgram, glGenVertexArrays,
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glCreateShader, glShaderSource, glCompileShader, glGetShaderiv,
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GL_COMPILE_STATUS, glGetShaderInfoLog, glGetUniformLocation,
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glGetAttribLocation, glUseProgram, glBindVertexArray, GL_TEXTURE0,
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GL_TEXTURE1, glGetIntegerv, GL_MAX_ARRAY_TEXTURE_LAYERS, glNamedBufferData,
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GL_MAX_TEXTURE_SIZE, glDeleteTexture, GL_TEXTURE_2D_ARRAY, glGenTextures,
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glBindTexture, glTexParameteri, GL_CLAMP_TO_EDGE, glDeleteBuffer,
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GL_TEXTURE_MAG_FILTER, GL_TEXTURE_MIN_FILTER, GL_TEXTURE_WRAP_S,
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GL_NEAREST, GL_TEXTURE_WRAP_T, glGenBuffers, GL_R8, GL_RED,
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GL_UNPACK_ALIGNMENT, GL_UNSIGNED_BYTE, GL_STATIC_DRAW, GL_STREAM_DRAW,
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GL_TEXTURE_BUFFER, GL_RGB32UI, GL_FLOAT, GL_ARRAY_BUFFER, glBindBuffer,
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glPixelStorei, glTexBuffer, glActiveTexture, glTexStorage3D,
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glCopyImageSubData, glTexSubImage3D, ITALIC, BOLD, SpriteMap,
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glEnableVertexAttribArray, glVertexAttribPointer, copy_image_sub_data
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)
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from .utils import safe_print
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GL_VERSION = (3, 3)
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VERSION = GL_VERSION[0] * 100 + GL_VERSION[1] * 10
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ITALIC_MASK = 1 << ITALIC
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BOLD_MASK = 1 << BOLD
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class Sprites:
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''' Maintain sprite sheets of all rendered characters on the GPU as a texture
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array with each texture being a sprite sheet. '''
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# TODO: Rewrite this class using the ARB_shader_image_load_store and ARB_shader_storage_buffer_object
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# extensions one they become available.
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def __init__(self):
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self.xnum = self.ynum = 1
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self.sampler_num = 0
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self.buffer_sampler_num = 1
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self.first_cell_cache = {}
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self.second_cell_cache = {}
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self.x = self.y = self.z = 0
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self.texture_id = self.buffer_texture_id = None
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self.last_num_of_layers = 1
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self.last_ynum = -1
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self.texture_unit = GL_TEXTURE0
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self.backend = SpriteMap(glGetIntegerv(GL_MAX_TEXTURE_SIZE), glGetIntegerv(GL_MAX_ARRAY_TEXTURE_LAYERS))
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self.lock = Lock()
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def do_layout(self, cell_width=1, cell_height=1):
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self.cell_width, self.cell_height = cell_width, cell_height
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self.backend.layout(cell_width or 1, cell_height or 1)
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if self.texture_id is not None:
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glDeleteTexture(self.texture_id)
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self.texture_id = None
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self.ensure_state()
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self.pre_render()
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def pre_render(self):
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# Pre-render the basic cells to ensure they have known sprite numbers
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def send(*a, **kw):
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buf = render_cell(*a, **kw)[0]
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x, y, z = self.backend.increment()
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self.send_to_gpu(x, y, z, buf)
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return x
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send() # blank
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send(underline=1)
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send(underline=2)
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if send(strikethrough=True) != 3:
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raise RuntimeError('Available OpenGL texture size is too small')
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@property
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def layout(self):
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return 1 / self.backend.xnum, 1 / self.backend.ynum
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def render_cell(self, text, bold, italic, is_second):
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first, second = render_cell(text, bold, italic)
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ans = second if is_second else first
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return ans or render_cell()[0]
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def render_dirty_cells(self):
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with self.lock:
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self.backend.render_dirty_cells(self.render_cell, self.send_to_gpu)
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def send_to_gpu(self, x, y, z, buf):
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if self.backend.z >= self.last_num_of_layers:
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self.realloc_texture()
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else:
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if self.backend.z == 0 and self.backend.ynum > self.last_ynum:
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self.realloc_texture()
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tgt = GL_TEXTURE_2D_ARRAY
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glBindTexture(tgt, self.texture_id)
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glPixelStorei(GL_UNPACK_ALIGNMENT, 1)
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x, y = x * self.cell_width, y * self.cell_height
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glTexSubImage3D(tgt, 0, x, y, z, self.cell_width, self.cell_height, 1, GL_RED, GL_UNSIGNED_BYTE, addressof(buf))
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glBindTexture(tgt, 0)
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def realloc_texture(self):
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tgt = GL_TEXTURE_2D_ARRAY
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tex = glGenTextures(1)
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glBindTexture(tgt, tex)
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# We use GL_NEAREST otherwise glyphs that touch the edge of the cell
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# often show a border between cells
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glTexParameteri(tgt, GL_TEXTURE_MIN_FILTER, GL_NEAREST)
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glTexParameteri(tgt, GL_TEXTURE_MAG_FILTER, GL_NEAREST)
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glTexParameteri(tgt, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE)
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glTexParameteri(tgt, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE)
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znum = self.backend.z + 1
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width, height = self.backend.xnum * self.cell_width, self.backend.ynum * self.cell_height
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glTexStorage3D(tgt, 1, GL_R8, width, height, znum)
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if self.texture_id is not None:
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ynum = self.backend.ynum
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if self.backend.z == 0:
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ynum -= 1 # Only copy the previous rows
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try:
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glCopyImageSubData(self.texture_id, tgt, 0, 0, 0, 0, tex, tgt, 0, 0, 0, 0,
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width, ynum * self.cell_height, self.last_num_of_layers)
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except RuntimeError:
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# OpenGL does not have ARB_copy_image
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if not hasattr(self, 'realloc_warned'):
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safe_print(
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'WARNING: Your system\'s OpenGL implementation does not have glCopyImageSubData, falling back to a slower implementation',
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file=sys.stderr)
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self.realloc_warned = True
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copy_image_sub_data(self.texture_id, tex, width, ynum * self.cell_height, self.last_num_of_layers)
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glBindTexture(tgt, tex)
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glDeleteTexture(self.texture_id)
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self.last_num_of_layers = znum
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self.last_ynum = self.backend.ynum
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self.texture_id = tex
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glBindTexture(tgt, 0)
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def destroy(self):
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if self.texture_id is not None:
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glDeleteTexture(self.texture_id)
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self.texture_id = None
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if self.buffer_texture_id is not None:
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glDeleteTexture(self.buffer_texture_id)
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def ensure_state(self):
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if self.texture_id is None:
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self.realloc_texture()
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self.buffer_texture_id = glGenTextures(1)
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self.buffer_texture_unit = GL_TEXTURE1
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def add_sprite_map(self):
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return glGenBuffers(1)
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def set_sprite_map(self, buf_id, data, usage=GL_STREAM_DRAW):
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self.bind_sprite_map(buf_id)
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glNamedBufferData(buf_id, sizeof(data), addressof(data), usage)
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def bind_sprite_map(self, buf_id):
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glBindBuffer(GL_TEXTURE_BUFFER, buf_id)
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glTexBuffer(GL_TEXTURE_BUFFER, GL_RGB32UI, buf_id)
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def destroy_sprite_map(self, buf_id):
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glDeleteBuffer(buf_id)
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def __enter__(self):
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self.ensure_state()
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glActiveTexture(self.texture_unit)
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glBindTexture(GL_TEXTURE_2D_ARRAY, self.texture_id)
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glActiveTexture(self.buffer_texture_unit)
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glBindTexture(GL_TEXTURE_BUFFER, self.buffer_texture_id)
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def __exit__(self, *a):
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glBindTexture(GL_TEXTURE_2D_ARRAY, 0)
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glBindTexture(GL_TEXTURE_BUFFER, 0)
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glBindBuffer(GL_TEXTURE_BUFFER, 0)
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glTexBuffer(GL_TEXTURE_BUFFER, GL_RGB32UI, 0)
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class ShaderProgram:
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""" Helper class for using GLSL shader programs """
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def __init__(self, vertex, fragment):
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"""
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Create a shader program.
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"""
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self.program_id = glCreateProgram()
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vs_id = self.add_shader(vertex, GL_VERTEX_SHADER)
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glAttachShader(self.program_id, vs_id)
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frag_id = self.add_shader(fragment, GL_FRAGMENT_SHADER)
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glAttachShader(self.program_id, frag_id)
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glLinkProgram(self.program_id)
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if glGetProgramiv(self.program_id, GL_LINK_STATUS) != GL_TRUE:
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info = glGetProgramInfoLog(self.program_id)
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glDeleteProgram(self.program_id)
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glDeleteShader(vs_id)
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glDeleteShader(frag_id)
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raise ValueError('Error linking shader program: \n%s' % info.decode('utf-8'))
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glDeleteShader(vs_id)
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glDeleteShader(frag_id)
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self.vao_id = glGenVertexArrays(1)
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self.buffers = {}
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def add_vertex_array(self, name, size=3, dtype=GL_FLOAT, normalized=False, stride=0, offset=0):
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glBindVertexArray(self.vao_id)
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if name not in self.buffers:
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self.buffers[name] = glGenBuffers(1)
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glBindBuffer(GL_ARRAY_BUFFER, self.buffers[name])
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aid = self.attribute_location(name)
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glEnableVertexAttribArray(aid)
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glVertexAttribPointer(aid, size, dtype, normalized, stride, offset)
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glBindBuffer(GL_ARRAY_BUFFER, 0)
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glBindVertexArray(0)
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def send_vertex_data(self, name, data, usage=GL_STATIC_DRAW):
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bufid = self.buffers[name]
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glNamedBufferData(bufid, sizeof(data), addressof(data), usage)
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def __hash__(self) -> int:
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return self.program_id
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def __eq__(self, other) -> bool:
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return isinstance(other, ShaderProgram) and other.program_id == self.program_id
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def __ne__(self, other) -> bool:
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return not self.__eq__(other)
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def add_shader(self, source: str, shader_type: int) -> int:
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' Compile a shader and return its id, or raise an exception if compilation fails '
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shader_id = glCreateShader(shader_type)
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source = '#version {}\n{}'.format(VERSION, source)
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try:
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glShaderSource(shader_id, source)
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glCompileShader(shader_id)
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if glGetShaderiv(shader_id, GL_COMPILE_STATUS) != GL_TRUE:
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info = glGetShaderInfoLog(shader_id)
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raise ValueError('GLSL {} compilation failed: \n{}'.format(shader_type, info.decode('utf-8')))
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return shader_id
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except Exception:
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glDeleteShader(shader_id)
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raise
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@lru_cache(maxsize=2**6)
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def uniform_location(self, name: str) -> int:
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' Return the id for the uniform variable `name` or -1 if not found. '
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return glGetUniformLocation(self.program_id, name)
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@lru_cache(maxsize=2**6)
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def attribute_location(self, name: str) -> int:
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' Return the id for the attribute variable `name` or -1 if not found. '
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return glGetAttribLocation(self.program_id, name)
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def __enter__(self):
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glUseProgram(self.program_id)
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glBindVertexArray(self.vao_id)
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def __exit__(self, *args):
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glUseProgram(0)
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glBindVertexArray(0)
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