def load_texture(fname):
img = QImage(fname)
ptr = c_void_p(int(img.constBits()))
tex_id = gl.glGenTextures(1)
gl.glBindTexture(gl.GL_TEXTURE_2D, tex_id)
gl.glTexImage2D(gl.GL_TEXTURE_2D, 0, gl.GL_RGBA8, img.width(), img.height(), 0, gl.GL_BGRA, gl.GL_UNSIGNED_BYTE, ptr)
gl.glGenerateMipmap(gl.GL_TEXTURE_2D)
gl.glTexParameteri(gl.GL_TEXTURE_2D, gl.GL_TEXTURE_MIN_FILTER, gl.GL_LINEAR_MIPMAP_LINEAR)
gl.glTexParameteri(gl.GL_TEXTURE_2D, gl.GL_TEXTURE_MAG_FILTER, gl.GL_LINEAR)
return tex_id
def loadFromFile(cls, path, internalFormat=GL_RGBA):
image = QImage(path)
image = QGLWidget.convertToGLFormat(image)
dataFormat = { QImage.Format_ARGB32: GL_RGBA }.get(image.format(), None)
dataType = GL_UNSIGNED_BYTE
data = [0] * image.numBytes()
bits = image.constBits()
bits.setsize(image.numBytes())
for i in range(image.numBytes()):
data[i] = bits[i][0]
return Texture2D(image.width(), image.height(), internalFormat, dataFormat, dataType, data)
def create_font_array(self, char_height=62, pixel_margin=1, font_family='Courier', font_weight=50):
# Load font and get the dimensions of one character (assuming monospaced font)
f = QFont(font_family)
f.setPixelSize(char_height)
f.setWeight(font_weight)
fm = QFontMetrics(f, QImage())
char_width = char_height = 0
char_y = 999
for i in range(32, 127):
bb = fm.boundingRect(chr(i))
char_width = max(char_width, bb.width())
char_height = max(char_height, bb.height())
char_y = min(char_y, bb.y())
imgsize = (char_width + 2 * pixel_margin, char_height + 2 * pixel_margin)
self.char_ar = float(imgsize[1]) / imgsize[0]
# init the image and the painter that will draw the characters to each image
img = QImage(imgsize[0], imgsize[1], QImage.Format_ARGB32)
ptr = c_void_p(int(img.constBits()))
painter = QPainter(img)
painter.setFont(f)
painter.setPen(QColor(255, 255, 255, 255))
# Set-up the texture array
self.tex_id = gl.glGenTextures(1)
gl.glBindTexture(gl.GL_TEXTURE_2D_ARRAY, self.tex_id)
gl.glTexImage3D(gl.GL_TEXTURE_2D_ARRAY, 0, gl.GL_RGBA8, imgsize[0], imgsize[1], 127 - 32, 0, gl.GL_BGRA, gl.GL_UNSIGNED_BYTE, None)
gl.glTexParameteri(gl.GL_TEXTURE_2D_ARRAY, gl.GL_TEXTURE_MIN_FILTER, gl.GL_LINEAR)
gl.glTexParameteri(gl.GL_TEXTURE_2D_ARRAY, gl.GL_TEXTURE_MAG_FILTER, gl.GL_LINEAR)
gl.glTexParameterf(gl.GL_TEXTURE_2D_ARRAY, gl.GL_TEXTURE_WRAP_S, gl.GL_CLAMP_TO_BORDER)
gl.glTexParameterf(gl.GL_TEXTURE_2D_ARRAY, gl.GL_TEXTURE_WRAP_T, gl.GL_CLAMP_TO_BORDER)
# We're using the ASCII range 32-126; space, uppercase, lower case, numbers, brackets, punctuation marks
for i in range(32, 127):
img.fill(0)
painter.drawText(pixel_margin, pixel_margin - char_y, chr(i))
gl.glTexSubImage3D(gl.GL_TEXTURE_2D_ARRAY, 0, 0, 0, i - 32, imgsize[0], imgsize[1], 1, gl.GL_BGRA, gl.GL_UNSIGNED_BYTE, ptr)
# We're done, close the painter, and return the texture ID, char width and char height
painter.end()