元素陣列緩沖區似乎不會影響影像，因為無論 的值如何，立方體的繪制都是相同的indices，該變數會改變顯示的點。
完整代碼：
import math
import glfw
import numpy
import pyrr
from OpenGL.GL import *
from OpenGL.GL.shaders import *
import sys
width, height = 500, 500
def draw():
global shader
cube = [-0.5, -0.5, 0.5, width/height, 0.0, 0.0, 1.0,
0.5, -0.5, 0.5, width/height, 0.0, 1.0, 1.0,
0.5, 0.5, 0.5, width/height, 1.0, 1.0, 1.0,
-0.5, 0.5, 0.5, width/height, 0.5, 0.5, 0.5,
-0.5, -0.5, -0.5, width/height, 0.4, 0.5, 0.6,
0.5, -0.5, -0.5, width/height, 1.0, 1.0, 0.88,
0.5, 0.5, -0.5, width/height, 1.0, 0.0, 1.0,
-0.5, 0.5, -0.5, width/height, 0.0, 0.0, 1.0]
cube = numpy.array(cube, dtype = numpy.float32)
indices = [0, 3, 2, 1]
indices = numpy.array(indices, dtype= numpy.uint32)
vertex_shader_ = """
#version 140
in vec4 position;
in vec3 color;
uniform mat4 transform;
out vec4 out_color;
void main(){
gl_Position = transform*position;
out_color = vec4(color.rgb, 1);
};
"""
fragment_shader_ = """
#version 140
in vec4 out_color;
void main(){
gl_FragColor = out_color;
};
"""
shader = compileProgram(compileShader(vertex_shader_, GL_VERTEX_SHADER),
compileShader(fragment_shader_, GL_FRAGMENT_SHADER))
glUseProgram(shader)
VBO = glGenBuffers(1)
print(cube.nbytes)
glBindBuffer(GL_ARRAY_BUFFER, VBO)
glBufferData(GL_ARRAY_BUFFER, cube.nbytes, cube, GL_STATIC_DRAW)
EBO = glGenBuffers(1)
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, EBO)
glBufferData(GL_ELEMENT_ARRAY_BUFFER, indices.nbytes, indices, GL_STATIC_DRAW)
position = glGetAttribLocation(shader, "position")
glVertexAttribPointer(position, 4, GL_FLOAT, GL_FALSE, 28, ctypes.c_void_p(0))
glEnableVertexAttribArray(position)
color = glGetAttribLocation(shader, "color")
glVertexAttribPointer(color, 3, GL_FLOAT, GL_FALSE, 28, ctypes.c_void_p(16))
glEnableVertexAttribArray(color)
rot_x = pyrr.Matrix44.from_x_rotation(0.5 * glfw.get_time() )
rot_y = pyrr.Matrix44.from_y_rotation(0.8 * glfw.get_time() )
transformLoc = glGetUniformLocation(shader, "transform")
glUniformMatrix4fv(transformLoc, 1, GL_FALSE, rot_x * rot_y)
glEnable(GL_DEPTH_TEST)
def Screen():
glClearColor(0, 0, 0, 1)
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)
glDrawArrays(GL_POLYGON, 0, 6000)
draw()
glViewport(0, 0, width, height)
def main():
global width, height
if not glfw.init():
return
window = glfw.create_window(500, 500, "Opengl GLFW Window", None, None)
if not window:
glfw.terminate()
return
glfw.make_context_current(window)
while not glfw.window_should_close(window):
glfw.poll_events()
Screen()
width, height = glfw.get_window_size(window)
print(width, height)
glViewport(0, 0, width, height)
glfw.swap_buffers(window)
glfw.terminate()
if __name__ == '__main__':
main()
的值indices應該只顯示立方體的一個面，而是顯示所有面。有沒有什么辦法解決這一問題？
uj5u.com熱心網友回復：
您必須使用glDrawElements而不是glDrawArrays. glDrawArrays按頂點順序渲染圖元。glDrawElements使用索引緩沖區呈現基元：
glDrawArrays(GL_POLYGON, 0, 6000)
glDrawElements(GL_POLYGON, 4, GL_UNSIGNED_INT, None)
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