python – 如何读取,从Superbible Opengl解析SBM文件格式
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呼吁专家,大师和任何人帮助在python中读取和解析文件.
在第6版的第751页上.或第7版的第800页. Superbible OpenGL有附录B. SBM文件格式似乎在一定程度上解释了格式.
我试图在python中实现这种文件格式的读者.
好的,已经取得了进展.我已将Rabbid76惊人的代码合并到提供的源代码中.虽然我试图取得进一步的进展.
更新于2019年6月23日 – 重大进展,修复了关于glVertexAttribPointer的错误(i,…错误.
同一天,修复了Python无法找到变量的第一个错误.
同一天,SUCCESS !!!!我们有一些东西呈现！这是最终的程序sbmloader.py,它读取,解析从这个问题创建的SBM文件格式.
虽然是下一个问题.已于part 2, creation of a ktxloader回答
>如何让渲染的对象显示为它应该是的圆环/圆环？也许这里加载文件有什么关系pattern1.ktx如何将它加载到变量tex_object变量？简单地分配它似乎没有做任何事情.好的,那是因为ktx文件是另一个项目的不同文件格式.
更新：2019年6月24日
Rabbid76使用完美的代码修复了渲染问题.我感到震惊,非常感谢你！
要读取的数据,解析就在这里torus_nrms_tc.sbm
任何帮助,评论或见解将不胜感激.
这是我到目前为止所拥有的.
import sys
import time
import os
import time
import math
import ctypes
currentWDir = os.getcwd()
print( 'current working directory: {}'.format( str(currentWDir) ) )
fileDir = os.path.dirname(os.path.abspath(__file__)) # det the directory of this file
print( 'current location of self: {}'.format( str(fileDir) ) )
parentDir = os.path.abspath(os.path.join(fileDir, os.pardir)) # get the parent directory of this file
sys.path.insert(0, parentDir)
print( 'insert system directory: {}'.format( str(parentDir) ) )
os.chdir( fileDir )
baseWDir = os.getcwd()
print( 'changed current working directory: {}'.format( str(baseWDir) ) )
print ( '' )
fullscreen = True
import numpy.matlib
import numpy as np
try:
from OpenGL.GLUT import *
from OpenGL.GL import *
from OpenGL.GLU import *
#from OpenGL.raw.GL.ARB.vertex_array_object import glGenVertexArrays, glBindVertexArray
except:
print ('''
ERROR: PyOpenGL not installed properly.
''')
sys.exit()
def SB6M_FOURCC(a,b,c,d):
return ( (ord(a) << 0) | (ord(b) << 8) | (ord(c) << 16) | (ord(d) << 24) )
SB6M_MAGIC = SB6M_FOURCC('S','B','6','M')
SB6M_CHUNK_TYPE_INDEX_DATA = SB6M_FOURCC('I','N','D','X')
SB6M_CHUNK_TYPE_VERTEX_DATA = SB6M_FOURCC('V','R','T','X')
SB6M_CHUNK_TYPE_VERTEX_ATTRIBS = SB6M_FOURCC('A','T','R','B')
SB6M_CHUNK_TYPE_SUB_OBJECT_LIST = SB6M_FOURCC('O','L','S','T')
SB6M_CHUNK_TYPE_COMMENT = SB6M_FOURCC('C','M','N','T')
SB6M_CHUNK_TYPE_DATA = SB6M_FOURCC('D','A','T','A')
class SB6M_HEADER:
def __init__(self, data):
int_data = np.frombuffer(np.array(data[:16], dtype=np.byte), dtype=np.uint32)
self.magic, self.size, self.num_chunks, self.flags = int_data
print(self.magic, self.size, self.num_chunks, self.flags)
class SB6M_CHUNK_HEADER:
def __init__(self, data, offset):
int_data = np.frombuffer(np.array(data[offset:offset+8], dtype=np.byte), dtype=np.uint32)
self.type, self.size = int_data
class SB6M_CHUNK_INDEX_DATA(SB6M_CHUNK_HEADER):
def __init__(self, data, offset):
super().__init__(data, offset)
int_data = np.frombuffer(np.array(data[offset+8:offset+20], dtype=np.byte), dtype=np.uint32)
self.index_type, self.index_count, self.index_data_offset = int_data
class SB6M_CHUNK_VERTEX_DATA(SB6M_CHUNK_HEADER):
def __init__(self, data, offset):
super().__init__(data, offset)
int_data = np.frombuffer(np.array(data[offset+8:offset+20], dtype=np.byte), dtype=np.uint32)
self.data_size, self.data_offset, self.total_vertices = int_data
class SB6M_CHUNK_VERTEX_DATA(SB6M_CHUNK_HEADER):
def __init__(self, data, offset):
super().__init__(data, offset)
int_data = np.frombuffer(np.array(data[offset+8:offset+20], dtype=np.byte), dtype=np.uint32)
self.data_size, self.data_offset, self.total_vertices = int_data
SB6M_VERTEX_ATTRIB_FLAG_NORMALIZED = 0x00000001
SB6M_VERTEX_ATTRIB_FLAG_INTEGER = 0x00000002
class SB6M_VERTEX_ATTRIB_DECL:
def __init__(self, data, offset):
self.name = ''.join([chr(n) for n in data[offset:offset+64] if n > 30])
int_data = np.frombuffer(np.array(data[offset+64:offset+84], dtype=np.byte), dtype=np.uint32)
self.size, self.type, self.stride, self.flags, self.data_offset = int_data
class SB6M_VERTEX_ATTRIB_CHUNK(SB6M_CHUNK_HEADER):
def __init__(self, data, offset):
super().__init__(data, offset)
int_data = np.frombuffer(np.array(data[offset+8:offset+12], dtype=np.byte), dtype=np.uint32)
self.attrib_count = int_data[0]
self.attrib_data = []
for i in range(self.attrib_count):
self.attrib_data.append(SB6M_VERTEX_ATTRIB_DECL(data, offset+12+i*84))
class SB6M_DATA_CHUNK(SB6M_CHUNK_HEADER):
def __init__(self, data, offset):
super().__init__(data, offset)
int_data = np.frombuffer(np.array(data[offset+8:offset+20], dtype=np.byte), dtype=np.uint32)
self.encoding, self.data_offset, self.data_length = int_data
class SB6M_SUB_OBJECT_DECL:
def __init__(self, data, offset):
int_data = np.frombuffer(np.array(data[offset:offset+8], dtype=np.byte), dtype=np.uint32)
self.first, self.count = int_data
class SB6M_CHUNK_SUB_OBJECT_LIST(SB6M_CHUNK_HEADER):
def __init__(self, data, offset):
super().__init__(data, offset)
int_data = np.frombuffer(np.array(data[offset+8:offset+12], dtype=np.byte), dtype=np.uint32)
self.count = int_data[0]
self.sub_object = []
for i in range(self.count):
self.sub_object.append(SB6M_SUB_OBJECT_DECL(data, offset+12+i*8))
class SB6M_CHUNK_HEADER_:
chunk_type = 0
chunk_name = ''
size = 0
class SB6M_DATA_ENCODING:
SB6M_DATA_ENCODING_RAW = 0
class SB6M_CHUNK_COMMENT:
header = SB6M_CHUNK_HEADER_()
comment = []
comment.append('')
comment.append('')
# data_buffer = GLuint(0)
# vao = GLuint(0)
# index_type = GLuint(0)
index_offset = GLuint(0)
def get_sub_object_info(index, first, count):
if (index >= num_sub_objects):
first = 0
count = 0
else:
first = sub_object[index].first;
count = sub_object[index].count;
def render(instance_count = 1, base_instance = 0):
render_sub_object(0, instance_count, base_instance)
class SBMObject:
def __init__(self):
self.vao = GLuint(0)
def load(self, filename):
vertex_attrib_chunk = None
vertex_data_chunk = None
index_data_chunk = None
sub_object_chunk = None
data_chunk = None
#try:
data = numpy.fromfile(filename, dtype=np.byte)
filesize = data.size
header = SB6M_HEADER(data)
offset = header.size
for i in range(header.num_chunks):
chunk = SB6M_CHUNK_HEADER(data, offset)
if chunk.type == SB6M_CHUNK_TYPE_VERTEX_ATTRIBS:
vertex_attrib_chunk = SB6M_VERTEX_ATTRIB_CHUNK(data, offset)
elif chunk.type == SB6M_CHUNK_TYPE_VERTEX_DATA:
vertex_data_chunk = SB6M_CHUNK_VERTEX_DATA(data, offset)
elif chunk.type == SB6M_CHUNK_TYPE_INDEX_DATA:
index_data_chunk = SB6M_CHUNK_INDEX_DATA(data, offset)
elif chunk.type == SB6M_CHUNK_TYPE_SUB_OBJECT_LIST:
sub_object_chunk = SB6M_CHUNK_SUB_OBJECT_LIST(data, offset)
elif chunk.type == SB6M_CHUNK_TYPE_DATA:
data_chunk = SB6M_DATA_CHUNK(data, offset)
else:
raise
offset += chunk.size
#except:
# print("error reading file {}".format(filename))
print("finished reading")
if vertex_data_chunk and vertex_attrib_chunk:
start = vertex_data_chunk.data_offset
end = start + vertex_data_chunk.data_size
vertex_data = np.frombuffer(np.array(data[start:end], dtype=np.byte), dtype=np.float)
data_buffer = glGenBuffers(1)
glBindBuffer(GL_ARRAY_BUFFER, data_buffer)
glBufferData(GL_ARRAY_BUFFER, vertex_data, GL_STATIC_DRAW)
self.vertexcount = vertex_data_chunk.total_vertices
self.vao = glGenVertexArrays(1)
glBindVertexArray(self.vao)
for attrib_i, attrib in enumerate(vertex_attrib_chunk.attrib_data):
if attrib.name=='position' or attrib.name=='map1':
glVertexAttribPointer(attrib_i,
attrib.size, attrib.type,
GL_TRUE if (attrib.flags & SB6M_VERTEX_ATTRIB_FLAG_NORMALIZED) != 0 else GL_FALSE,
attrib.stride, ctypes.c_void_p(int(attrib.data_offset)))
glEnableVertexAttribArray(attrib_i)
def render(self):
glBindVertexArray(self.vao)
glDrawArrays(GL_TRIANGLES, 0, self.vertexcount)
# Vertex program
vs_source = '''
#version 420 core
uniform mat4 mv_matrix;
uniform mat4 proj_matrix;
layout (location = 0) in vec4 position;
layout (location = 4) in vec2 tc;
out VS_OUT
{
vec2 tc;
} vs_out;
void main(void)
{
vec4 pos_vs = mv_matrix * position;
vs_out.tc = tc;
gl_Position = proj_matrix * pos_vs;
}
'''
# Fragment program
fs_source = '''
#version 420 core
layout (binding = 0) uniform sampler2D tex_object;
in VS_OUT
{
vec2 tc;
} fs_in;
out vec4 color;
void main(void)
{
color = texture(tex_object, fs_in.tc * vec2(3.0, 1.0));
}
'''
identityMatrix = [1,0,0,0, 0,1,0,0, 0,0,1,0, 0,0,0,1]
render_prog = GLuint(0)
uniforms_mv_matrix = (GLfloat * 16)(*identityMatrix)
uniforms_proj_matrix = (GLfloat * 16)(*identityMatrix)
tex_index = 0
tex_object = []
M3D_PI = 3.14159265358979323846
M3D_PI_DIV_180 = M3D_PI / 180.0
M3D_INV_PI_DIV_180 = 57.2957795130823229
def m3dDegToRad(num):
return (num * M3D_PI_DIV_180)
def m3dRadToDeg(num):
return (num * M3D_INV_PI_DIV_180)
# Translate matrix. Only 4x4 matrices supported
def m3dTranslateMatrix44(m, x, y, z):
m[12] += x
m[13] += y
m[14] += z
# Creates a 4x4 rotation matrix, takes radians NOT degrees
def m3dRotationMatrix44(m, angle, x, y, z):
s = math.sin(angle)
c = math.cos(angle)
mag = float((x * x + y * y + z * z) ** 0.5)
if mag == 0.0:
m3dLoadIdentity(m)
return
x /= mag
y /= mag
z /= mag
xx = x * x
yy = y * y
zz = z * z
xy = x * y
yz = y * z
zx = z * x
xs = x * s
ys = y * s
zs = z * s
one_c = 1.0 - c
m[0] = (one_c * xx) + c
m[1] = (one_c * xy) - zs
m[2] = (one_c * zx) + ys
m[3] = 0.0
m[4] = (one_c * xy) + zs
m[5] = (one_c * yy) + c
m[6] = (one_c * yz) - xs
m[7] = 0.0
m[8] = (one_c * zx) - ys
m[9] = (one_c * yz) + xs
m[10] = (one_c * zz) + c
m[11] = 0.0
m[12] = 0.0
m[13] = 0.0
m[14] = 0.0
m[15] = 1.0
def m3dMultiply(A, B):
C = (GLfloat * 16)(*identityMatrix)
for k in range(0, 4):
for j in range(0, 4):
C[k*4+j] = A[0*4+j] * B[k*4+0] + A[1*4+j] * B[k*4+1] + \
A[2*4+j] * B[k*4+2] + A[3*4+j] * B[k*4+3]
return C
def m3dOrtho(l, r, t, b, n, f):
return (GLfloat * 16)(
2/(r-l), 0, 0, 0,
0, 2/(t-b), 0, 0,
0, 0, -2/(f-n), 0,
-(r+l)/(r-l), -(t+b)/(t-b), -(f+n)/(f-n), 1)
def m3dPerspective(fov_y, aspect, n, f):
a = aspect
ta = math.tan( fov_y / 2 )
return (GLfloat * 16)(
1/(ta*a), 0, 0, 0,
0, 1/ta, 0, 0,
0, 0, -(f+n)/(f-n), -1,
0, 0, -2*f*n/(f-n), 0)
def rotation_matrix(axis, theta):
"""
Return the rotation matrix associated with counterclockwise rotation about
the given axis by theta radians.
"""
axis = np.asarray(axis)
axis = axis / math.sqrt(np.dot(axis, axis))
a = math.cos(theta / 2.0)
b, c, d = -axis * math.sin(theta / 2.0)
aa, bb, cc, dd = a * a, b * b, c * c, d * d
bc, ad, ac, ab, bd, cd = b * c, a * d, a * c, a * b, b * d, c * d
return np.array([[aa + bb - cc - dd, 2 * (bc + ad), 2 * (bd - ac), 0],
[2 * (bc - ad), aa + cc - bb - dd, 2 * (cd + ab), 0],
[2 * (bd + ac), 2 * (cd - ab), aa + dd - bb - cc, 0],
[0,0,0,1]])
def translate(tx, ty, tz):
"""creates the matrix equivalent of glTranslate"""
return np.array([1.0, 0.0, 0.0, 0.0,
0.0, 1.0, 0.0, 0.0,
0.0, 0.0, 1.0, 0.0,
tx, ty, tz, 1.0], np.float32)
def load_shaders():
global render_prog
global uniforms_mv_matrix
global uniforms_proj_matrix
if (render_prog):
glDeleteProgram(render_prog);
fs = glCreateShader(GL_FRAGMENT_SHADER);
glShaderSource(fs, fs_source);
glCompileShader(fs);
vs = glCreateShader(GL_VERTEX_SHADER);
glShaderSource(vs, vs_source);
glCompileShader(vs);
render_prog = glCreateProgram();
glAttachShader(render_prog, vs);
glAttachShader(render_prog, fs);
glLinkProgram(render_prog);
glDeleteShader(vs);
glDeleteShader(fs);
uniforms_mv_matrix = glGetUniformLocation(render_prog, "mv_matrix");
uniforms_proj_matrix = glGetUniformLocation(render_prog, "proj_matrix");
class Scene:
def __init__(self, width, height):
self.width = width
self.height = height
B = (0x00, 0x00, 0x00, 0x00)
W = (0xFF, 0xFF, 0xFF, 0xFF)
tex_data = [
B, W, B, W, B, W, B, W, B, W, B, W, B, W, B, W,
W, B, W, B, W, B, W, B, W, B, W, B, W, B, W, B,
B, W, B, W, B, W, B, W, B, W, B, W, B, W, B, W,
W, B, W, B, W, B, W, B, W, B, W, B, W, B, W, B,
B, W, B, W, B, W, B, W, B, W, B, W, B, W, B, W,
W, B, W, B, W, B, W, B, W, B, W, B, W, B, W, B,
B, W, B, W, B, W, B, W, B, W, B, W, B, W, B, W,
W, B, W, B, W, B, W, B, W, B, W, B, W, B, W, B,
B, W, B, W, B, W, B, W, B, W, B, W, B, W, B, W,
W, B, W, B, W, B, W, B, W, B, W, B, W, B, W, B,
B, W, B, W, B, W, B, W, B, W, B, W, B, W, B, W,
W, B, W, B, W, B, W, B, W, B, W, B, W, B, W, B,
B, W, B, W, B, W, B, W, B, W, B, W, B, W, B, W,
W, B, W, B, W, B, W, B, W, B, W, B, W, B, W, B,
B, W, B, W, B, W, B, W, B, W, B, W, B, W, B, W,
W, B, W, B, W, B, W, B, W, B, W, B, W, B, W, B,
]
tex_object.append( glGenTextures(1) )
#glGenTextures(1, tex_object[0]);
glBindTexture(GL_TEXTURE_2D, tex_object[0]);
glTexStorage2D(GL_TEXTURE_2D, 1, GL_RGB8, 16, 16);
glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 16, 16, GL_RGBA, GL_UNSIGNED_BYTE, tex_data);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
tex_object.append ( glGenTextures(1) )
#tex_object[1] = sb7::ktx::file::load("pattern1.ktx");
myobject.load("torus_nrms_tc.sbm");
load_shaders();
glEnable(GL_DEPTH_TEST);
glDepthFunc(GL_LEQUAL);
def display(self):
global uniforms_mv_matrix
global uniforms_proj_matrix
currentTime = time.time()
gray = [ 0.2, 0.2, 0.2, 1.0 ];
ones = [ 1.0 ];
glClearBufferfv(GL_COLOR, 0, gray);
glClearBufferfv(GL_DEPTH, 0, ones);
glViewport(0, 0, self.width, self.height);
glBindTexture(GL_TEXTURE_2D, tex_object[tex_index]);
glUseProgram(render_prog);
T = (GLfloat * 16)(*identityMatrix)
RX = (GLfloat * 16)(*identityMatrix)
RY = (GLfloat * 16)(*identityMatrix)
R = (GLfloat * 16)(*identityMatrix)
# way # 1 - works
# T = translate(0.0, 0.0, -4.0).reshape(4,4)
# RX = np.array(rotation_matrix( [1.0, 0.0, 0.0], currentTime * m3dDegToRad(17.0)))
# RY = np.array(rotation_matrix( [0.0, 1.0, 0.0], currentTime * m3dDegToRad(13.0)))
# mv_matrix = np.matmul(np.matmul(RY, RX), T)
# way # 2 - works !!
m3dTranslateMatrix44(T, 0, 0, -4)
m3dRotationMatrix44(RX, currentTime * m3dDegToRad(17.0), 1.0, 0.0, 0.0)
m3dRotationMatrix44(RY, currentTime * m3dDegToRad(13.0), 0.0, 1.0, 0.0)
# way # 2 - option A works!
# Matrix multiplication is not commutative, order matters when multiplying matrices
R = m3dMultiply(RY, RX)
mv_matrix = m3dMultiply(T, R)
# way # 2 - option B works!
# T = np.matrix(T).reshape(4,4)
# mv_matrix = np.matmul(np.matmul(np.matrix(RY).reshape(4,4), np.matrix(RX).reshape(4,4)).reshape(4,4), T)
# way # 3 - works also
# T = np.matrix(translate(0.0, 0.0, -4.0)).reshape(4,4)
# RX = np.matrix(rotation_matrix( [1.0, 0.0, 0.0], currentTime * m3dDegToRad(17.0)))
# RY = np.matrix(rotation_matrix( [0.0, 1.0, 0.0], currentTime * m3dDegToRad(13.0)))
# mv_matrix = RX * RY * T
proj_matrix = (GLfloat * 16)(*identityMatrix)
proj_matrix = m3dPerspective(m3dDegToRad(60.0), float(self.width) / float(self.height), 0.1, 100.0);
glUniformMatrix4fv(uniforms_mv_matrix, 1, GL_FALSE, mv_matrix);
glUniformMatrix4fv(uniforms_proj_matrix, 1, GL_FALSE, proj_matrix);
myobject.render()
#gltDrawTorus(0.35, 0.15, 40, 20)
glutSwapBuffers()
def reshape(self, width, height):
self.width = width
self.height = height
def keyboard(self, key, x, y ):
global fullscreen
global tex_index
print ('key:' , key)
if key == b'\x1b': # ESC
sys.exit()
elif key == b'f' or key == b'F': #fullscreen toggle
if (fullscreen == True):
glutReshapeWindow(self.width, self.height)
glutPositionWindow(int((1360/2)-(512/2)), int((768/2)-(512/2)))
fullscreen = False
else:
glutFullScreen()
fullscreen = True
elif key == b'r' or key == b'R':
load_shaders()
elif key == b't' or key == b'T':
tex_index+=1
if (tex_index > 1):
tex_index = 0
print('done')
def init(self):
pass
def timer(self, blah):
glutPostRedisplay()
glutTimerFunc( int(1/60), self.timer, 0)
time.sleep(1/20.0)
myobject = SBMObject()
if __name__ == '__main__':
start = time.time()
glutInit()
glutInitDisplayMode(GLUT_RGBA | GLUT_DOUBLE | GLUT_DEPTH)
glutInitWindowSize(512, 512)
w1 = glutCreateWindow('OpenGL SuperBible - Texture Coordinates')
fullscreen = False
#glutFullScreen()
scene = Scene(512, 512)
glutReshapeFunc(scene.reshape)
glutDisplayFunc(scene.display)
glutKeyboardFunc(scene.keyboard)
glutIdleFunc(scene.display)
#glutTimerFunc( int(1/60), scene.timer, 0)
scene.init()
glutMainLoop()
纹理文件的数据结构示例 – p.757 OpenGL Superbible第6版.或p.807第7版.
解决方法:
由于你已经在使用NumPy,我将给你一个使用NumPy读取二进制文件的答案. NumPy有一些功能可以按不同的数据类型重新解释缓冲区数据,这正是解释二进制文件所需要的.
二进制文件可以通过numpy.fromfile.e.g读取一个字节数组.
data = numpy.fromfile(filename, dtype=np.byte)
到numpy.frombuffer,数组的某些字节可以解释为无符号整数(unit32).例如：
class SB6M_HEADER:
def __init__(self, data):
int_data = np.frombuffer(np.array(data[:16], dtype=np.byte), dtype=np.uint32)
self.magic, self.size, self.num_chunks, self.flags = int_data
print(self.magic, self.size, self.num_chunks, self.flags)
将源代码从sb6mfile.h分别移植到sb7object.cpp到python并读取和“* .sbm”文件：
def SB6M_FOURCC(a,b,c,d):
return ( (ord(a) << 0) | (ord(b) << 8) | (ord(c) << 16) | (ord(d) << 24) )
SB6M_MAGIC = SB6M_FOURCC('S','B','6','M')
SB6M_CHUNK_TYPE_INDEX_DATA = SB6M_FOURCC('I','N','D','X')
SB6M_CHUNK_TYPE_VERTEX_DATA = SB6M_FOURCC('V','R','T','X')
SB6M_CHUNK_TYPE_VERTEX_ATTRIBS = SB6M_FOURCC('A','T','R','B')
SB6M_CHUNK_TYPE_SUB_OBJECT_LIST = SB6M_FOURCC('O','L','S','T')
SB6M_CHUNK_TYPE_COMMENT = SB6M_FOURCC('C','M','N','T')
SB6M_CHUNK_TYPE_DATA = SB6M_FOURCC('D','A','T','A')
class SB6M_HEADER:
def __init__(self, data):
int_data = np.frombuffer(np.array(data[:16], dtype=np.byte), dtype=np.uint32)
self.magic, self.size, self.num_chunks, self.flags = int_data
print(self.magic, self.size, self.num_chunks, self.flags)
class SB6M_CHUNK_HEADER:
def __init__(self, data, offset):
int_data = np.frombuffer(np.array(data[offset:offset+8], dtype=np.byte), dtype=np.uint32)
self.type, self.size = int_data
class SB6M_CHUNK_INDEX_DATA(SB6M_CHUNK_HEADER):
def __init__(self, data, offset):
super().__init__(data, offset)
int_data = np.frombuffer(np.array(data[offset+8:offset+20], dtype=np.byte), dtype=np.uint32)
self.index_type, self.index_count, self.index_data_offset = int_data
class SB6M_CHUNK_VERTEX_DATA(SB6M_CHUNK_HEADER):
def __init__(self, data, offset):
super().__init__(data, offset)
int_data = np.frombuffer(np.array(data[offset+8:offset+20], dtype=np.byte), dtype=np.uint32)
self.data_size, self.data_offset, self.total_vertices = int_data
class SB6M_CHUNK_VERTEX_DATA(SB6M_CHUNK_HEADER):
def __init__(self, data, offset):
super().__init__(data, offset)
int_data = np.frombuffer(np.array(data[offset+8:offset+20], dtype=np.byte), dtype=np.uint32)
self.data_size, self.data_offset, self.total_vertices = int_data
SB6M_VERTEX_ATTRIB_FLAG_NORMALIZED = 0x00000001
SB6M_VERTEX_ATTRIB_FLAG_INTEGER = 0x00000002
class SB6M_VERTEX_ATTRIB_DECL:
def __init__(self, data, offset):
self.name = ''.join([chr(n) for n in data[offset:offset+64] if n > 30])
int_data = np.frombuffer(np.array(data[offset+64:offset+84], dtype=np.byte), dtype=np.uint32)
self.size, self.type, self.stride, self.flags, self.data_offset = int_data
class SB6M_VERTEX_ATTRIB_CHUNK(SB6M_CHUNK_HEADER):
def __init__(self, data, offset):
super().__init__(data, offset)
int_data = np.frombuffer(np.array(data[offset+8:offset+12], dtype=np.byte), dtype=np.uint32)
self.attrib_count = int_data[0]
self.attrib_data = []
for i in range(self.attrib_count):
self.attrib_data.append(SB6M_VERTEX_ATTRIB_DECL(data, offset+12+i*84))
class SB6M_DATA_CHUNK(SB6M_CHUNK_HEADER):
def __init__(self, data, offset):
super().__init__(data, offset)
int_data = np.frombuffer(np.array(data[offset+8:offset+20], dtype=np.byte), dtype=np.uint32)
self.encoding, self.data_offset, self.data_length = int_data
class SB6M_SUB_OBJECT_DECL:
def __init__(self, data, offset):
int_data = np.frombuffer(np.array(data[offset:offset+8], dtype=np.byte), dtype=np.uint32)
self.first, self.count = int_data
class SB6M_CHUNK_SUB_OBJECT_LIST(SB6M_CHUNK_HEADER):
def __init__(self, data, offset):
super().__init__(data, offset)
int_data = np.frombuffer(np.array(data[offset+8:offset+12], dtype=np.byte), dtype=np.uint32)
self.count = int_data[0]
self.sub_object = []
for i in range(self.count):
self.sub_object.append(SB6M_SUB_OBJECT_DECL(data, offset+12+i*8))
def load(filename):
vertex_attrib_chunk = None
vertex_data_chunk = None
index_data_chunk = None
sub_object_chunk = None
data_chunk = None
try:
data = numpy.fromfile(filename, dtype=np.byte)
filesize = data.size
header = SB6M_HEADER(data)
offset = header.size
for i in range(header.num_chunks):
chunk = SB6M_CHUNK_HEADER(data, offset)
if chunk.type == SB6M_CHUNK_TYPE_VERTEX_ATTRIBS:
vertex_attrib_chunk = SB6M_VERTEX_ATTRIB_CHUNK(data, offset)
elif chunk.type == SB6M_CHUNK_TYPE_VERTEX_DATA:
vertex_data_chunk = SB6M_CHUNK_VERTEX_DATA(data, offset)
elif chunk.type == SB6M_CHUNK_TYPE_INDEX_DATA:
index_data_chunk = SB6M_CHUNK_INDEX_DATA(data, offset)
elif chunk.type == SB6M_CHUNK_TYPE_SUB_OBJECT_LIST:
sub_object_chunk = SB6M_CHUNK_SUB_OBJECT_LIST(data, offset)
elif chunk.type == SB6M_CHUNK_TYPE_DATA:
data_chunk = SB6M_DATA_CHUNK(data, offset)
else:
raise
offset += chunk.size
except:
print("error reading file {}".format(filename))
最后可以读取浮点顶点数据：
if vertex_data_chunk and vertex_attrib_chunk:
start = vertex_data_chunk.data_offset
end = start + vertex_data_chunk.data_size
vertex_data = np.frombuffer(np.array(data[start:end], dtype=np.byte), dtype=np.float)
data_buffer = glGenBuffers(1)
glBindBuffer(GL_ARRAY_BUFFER, data_buffer)
glBufferData(GL_ARRAY_BUFFER, vertex_data, GL_STATIC_DRAW)
vertexcount = vertex_data_chunk.total_vertices
vao = glGenVertexArrays(1)
glBindVertexArray(self.vao)
for attrib_i, attrib in enumerate(vertex_attrib_chunk.attrib_data):
if attrib.name=='position' or attrib.name=='map1':
glVertexAttribPointer(attrib_i,
attrib.size, attrib.type,
GL_TRUE if (attrib.flags & SB6M_VERTEX_ATTRIB_FLAG_NORMALIZED) != 0 else GL_FALSE,
attrib.stride, ctypes.c_void_p(int(attrib.data_offset)))
glEnableVertexAttribArray(attrib_i)
最后绘制网格：
glBindVertexArray(vao)
glDrawArrays(GL_TRIANGLES, 0, vertexcount)
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