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brute_force_bc4.py
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import os
from PIL import Image # poor mans OIIO
import numpy
from OpenGL.GL import *
from OpenGL.GL.EXT import texture_compression_rgtc
import viewport
_DEBUGGING = False
_SHADER_DIR = os.path.abspath(
os.path.join(__file__, "..", "shaders")
)
_BRUTE_FORCE_BC4_ITERATION = viewport.make_permutation_program(
_DEBUGGING,
GL_COMPUTE_SHADER = os.path.join(_SHADER_DIR, "brute_force_bc4_iteration.comp")
)
_BRUTE_FORCE_BC4_VIS = viewport.make_permutation_program(
_DEBUGGING,
GL_VERTEX_SHADER = os.path.join(_SHADER_DIR, "draw_full_screen.vert"),
GL_FRAGMENT_SHADER = os.path.join(_SHADER_DIR, "brute_force_bc4_quant_vis.frag")
)
_BRUTE_FORCE_BC4_PREV = viewport.make_permutation_program(
_DEBUGGING,
GL_VERTEX_SHADER = os.path.join(_SHADER_DIR, "draw_full_screen.vert"),
GL_FRAGMENT_SHADER = os.path.join(_SHADER_DIR, "brute_force_bc4_prev.frag")
)
_BRUTE_FORCE_BC4_FINALIZE = viewport.make_permutation_program(
_DEBUGGING,
GL_COMPUTE_SHADER = os.path.join(_SHADER_DIR, "brute_force_bc4_finalize.comp")
)
class Renderer(object):
def __init__(self):
self.window = viewport.Window(512, 512)
self.window.on_init = self._init
self.window.on_draw = self._draw
self.window.on_resize = self._resize
self.window.on_drag = self._drag
self.window.on_keypress = self._keypress
self._iteration = 0
self._show_quant = 1
self._show_bc4_texture = 0
self._write_bc4_out_texture = 0
self._made_bc4_texture = False
self._current_bc4_bytes = None
def run(self):
self.window.run()
def _init(self, wnd):
glClearColor(0.0, 0.0, 0.0, 0.0)
self._brute_force_bc4_iter_program = _BRUTE_FORCE_BC4_ITERATION.get()
self._brute_force_bc4_finalize_program = _BRUTE_FORCE_BC4_FINALIZE.get()
bluenoise = Image.open("data/bn/BlueNoise64Tiled.png")
bluenoise_data = numpy.array(bluenoise.getdata(), dtype=numpy.uint8)
self._bn_texture_ptr = ctypes.c_int()
glCreateTextures(GL_TEXTURE_2D, 1, self._bn_texture_ptr)
self._bluenoise_tex = self._bn_texture_ptr.value
glTextureParameteri(self._bluenoise_tex, GL_TEXTURE_WRAP_S, GL_REPEAT)
glTextureParameteri(self._bluenoise_tex, GL_TEXTURE_WRAP_T, GL_REPEAT)
glTextureParameteri(self._bluenoise_tex, GL_TEXTURE_MIN_FILTER, GL_LINEAR)
glTextureParameteri(self._bluenoise_tex, GL_TEXTURE_MAG_FILTER, GL_LINEAR)
glTextureStorage2D(
self._bluenoise_tex,
1,
GL_R8,
bluenoise.width,
bluenoise.height
)
glTextureSubImage2D(
self._bluenoise_tex, 0, 0, 0,
bluenoise.width, bluenoise.height,
GL_RGBA, GL_UNSIGNED_BYTE,
bluenoise_data
)
self._bc4_iter_texture_ptr = ctypes.c_int()
glCreateTextures(GL_TEXTURE_2D, 1, self._bc4_iter_texture_ptr)
self._bc4_iter_tex = self._bc4_iter_texture_ptr.value
glTextureParameteri(self._bc4_iter_tex, GL_TEXTURE_WRAP_S, GL_REPEAT)
glTextureParameteri(self._bc4_iter_tex, GL_TEXTURE_WRAP_T, GL_REPEAT)
glTextureParameteri(self._bc4_iter_tex, GL_TEXTURE_MIN_FILTER, GL_LINEAR)
glTextureParameteri(self._bc4_iter_tex, GL_TEXTURE_MAG_FILTER, GL_LINEAR)
glTextureStorage2D(
self._bc4_iter_tex,
1,
GL_RGBA32F,
bluenoise.width >> 2,
bluenoise.height >> 2
)
self._bc4_final_texture_ptr = ctypes.c_int()
glCreateTextures(GL_TEXTURE_2D, 1, self._bc4_final_texture_ptr)
self._bc4_final_tex = self._bc4_final_texture_ptr.value
glTextureParameteri(self._bc4_final_tex, GL_TEXTURE_WRAP_S, GL_REPEAT)
glTextureParameteri(self._bc4_final_tex, GL_TEXTURE_WRAP_T, GL_REPEAT)
glTextureParameteri(self._bc4_final_tex, GL_TEXTURE_MIN_FILTER, GL_LINEAR)
glTextureParameteri(self._bc4_final_tex, GL_TEXTURE_MAG_FILTER, GL_LINEAR)
glTextureStorage2D(
self._bc4_final_tex,
1,
GL_RG32UI,
bluenoise.width >> 2,
bluenoise.height >> 2
)
self._bc4_preview_texture_ptr = ctypes.c_int()
glCreateTextures(GL_TEXTURE_2D, 1, self._bc4_preview_texture_ptr)
self._bc4_preview_tex = self._bc4_preview_texture_ptr.value
glTextureParameteri(self._bc4_preview_tex, GL_TEXTURE_WRAP_S, GL_REPEAT)
glTextureParameteri(self._bc4_preview_tex, GL_TEXTURE_WRAP_T, GL_REPEAT)
glTextureParameteri(self._bc4_preview_tex, GL_TEXTURE_MIN_FILTER, GL_LINEAR)
glTextureParameteri(self._bc4_preview_tex, GL_TEXTURE_MAG_FILTER, GL_LINEAR)
glTextureStorage2D(
self._bc4_preview_tex,
1,
texture_compression_rgtc.GL_COMPRESSED_RED_RGTC1_EXT,
bluenoise.width,
bluenoise.height
)
self._bc4_texture_size = (bluenoise.width >> 2, bluenoise.height >> 2)
self._texture_size = (bluenoise.width, bluenoise.height)
self._inv_texture_size = (1.0 / bluenoise.width, 1.0 / bluenoise.height)
glViewport(0, 0, wnd.width, wnd.height)
def _draw(self, wnd):
if self._iteration == 0:
clear_value = numpy.array([0, 0, float("inf"), 0], dtype=numpy.float32)
glClearTexImage(self._bc4_iter_tex, 0, GL_RGBA, GL_FLOAT, clear_value)
self._iteration += 1
if self._iteration < 256:
glUseProgram(self._brute_force_bc4_iter_program)
glUniform2i(1, self._bc4_texture_size[0], self._bc4_texture_size[1])
glUniform2f(2, self._inv_texture_size[0], self._inv_texture_size[1])
glBindTextureUnit(0, self._bluenoise_tex)
glBindImageTexture(
1,
self._bc4_iter_tex,
0,
0,
0,
GL_READ_WRITE,
GL_RGBA32F
)
glUniform1i(0, self._iteration)
glDispatchCompute(
(self._bc4_texture_size[0] + 7)//8,
(self._bc4_texture_size[1] + 7)//8,
1
)
# lazy
glMemoryBarrier(GL_ALL_BARRIER_BITS)
self._iteration += 1
self._made_bc4_texture = False
need_bc4_texture = self._show_bc4_texture | self._write_bc4_out_texture
if need_bc4_texture and (self._made_bc4_texture is False):
self._made_bc4_texture = True
glUseProgram(self._brute_force_bc4_finalize_program)
glUniform2i(0, self._bc4_texture_size[0], self._bc4_texture_size[1])
glUniform2f(1, self._inv_texture_size[0], self._inv_texture_size[1])
glBindTextureUnit(0, self._bluenoise_tex)
glBindImageTexture(
1,
self._bc4_iter_tex,
0,
0,
0,
GL_READ_ONLY,
GL_RGBA32F
)
glBindImageTexture(
2,
self._bc4_final_tex,
0,
0,
0,
GL_WRITE_ONLY,
GL_RG32UI
)
glDispatchCompute(
(self._bc4_texture_size[0] + 7)//8,
(self._bc4_texture_size[1] + 7)//8,
1
)
# lazy
glMemoryBarrier(GL_ALL_BARRIER_BITS)
size = self._bc4_texture_size[0] * self._bc4_texture_size[1] * 4 * 2
self._current_bc4_bytes = bytearray(size)
glGetTextureImage(
self._bc4_final_tex,
0,
GL_RG_INTEGER,
GL_UNSIGNED_INT,
size,
memoryview(self._current_bc4_bytes)
)
glCompressedTextureSubImage2D(
self._bc4_preview_tex,
0,
0, 0,
self._texture_size[0], self._texture_size[1],
texture_compression_rgtc.GL_COMPRESSED_RED_RGTC1_EXT,
size,
memoryview(self._current_bc4_bytes)
)
if self._write_bc4_out_texture:
self._write_bc4_out_texture = 0
with open("data/bn/BlueNoise64Tiled.bc4", "wb") as out_fp:
out_fp.write(self._current_bc4_bytes)
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)
glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_FALSE)
glDepthMask(GL_FALSE)
glDisable(GL_DEPTH_TEST)
glEnable(GL_BLEND)
glBlendFunc(GL_ONE, GL_ONE)
if self._show_bc4_texture:
glUseProgram(_BRUTE_FORCE_BC4_PREV.get(
VS_OUTPUT_UV=0
))
glBindTextureUnit(0, self._bc4_preview_tex)
else:
glUseProgram(_BRUTE_FORCE_BC4_VIS.get(
VS_OUTPUT_UV=0,
SHOW_BC_QUANTIZATION=self._show_quant
))
glBindTextureUnit(0, self._bluenoise_tex)
glBindTextureUnit(1, self._bc4_iter_tex)
glUniform2f(0, self._texture_size[0], self._texture_size[1])
glBindVertexArray(viewport.get_dummy_vao())
glDrawArrays(GL_TRIANGLES, 0, 3)
glBlendFunc(GL_ONE, GL_ZERO)
glDisable(GL_BLEND)
glEnable(GL_DEPTH_TEST)
glDepthMask(GL_TRUE)
glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE)
def _resize(self, wnd, width, height):
glViewport(0, 0, width, height)
def _keypress(self, wnd, key, x, y):
# Restart
if key == b'r':
self._iteration = 0
if key == b'q':
self._show_quant ^= 1
if key == b'b':
self._show_bc4_texture ^= 1
if key == b'w':
self._write_bc4_out_texture = 1
wnd.redraw()
def _drag(self, wnd, x, y, button):
wnd.redraw()
if __name__ == "__main__":
Renderer().run()