我正在考虑切换到 ModernGL 而不是 PyOpenGL，而且我现在正在努力实现任何东西。首先，我想尝试经典的“使用时间均匀和正弦函数改变形状的三角形”，但我一直不知道如何写入均匀。以下是文档对此的说明：统一是使用“统一”存储限定符声明的全局 GLSL 变量。这些充当着色器程序的用户可以传递给该程序的参数。在 ModernGL 中，可以使用Program.__getitem__()或访问制服Program.__iter__()。# Set a vec4 uniformuniform['color'] = 1.0, 1.0, 1.0, 1.0# Optionally we can store references to a member and set the value directlyuniform = program['color']uniform.value = 1.0, 0.0, 0.0, 0.0uniform = program['cameraMatrix']uniform.write(camera_matrix)这是我的代码：import moderngl as mglimport glfwimport numpy as npimport timefrom math import singlfw.init()glfw.window_hint(glfw.CONTEXT_VERSION_MAJOR, 3)glfw.window_hint(glfw.CONTEXT_VERSION_MINOR, 3)glfw.window_hint(glfw.OPENGL_PROFILE, glfw.OPENGL_CORE_PROFILE)window = glfw.create_window(800, 600, "__DELETEME__", None, None)glfw.make_context_current(window)context = mgl.create_context()vertex_source = """#version 330 corein vec2 aPos;uniform float time;void main() { gl_Position = vec4(aPos.x, aPos.y + sin(time), 0.0, 1.0);}"""fragment_source = """#version 330 coreout vec4 color;void main(){ color = vec4(0.0, 0.0, 1.0, 1.0);}"""program = context.program(vertex_shader=vertex_source, fragment_shader=fragment_source)data = np.array([ 0.5, 0, -0.5, 0, 0, 0.5], dtype = "float32")vbo = context.buffer(data.tobytes())vao = context.vertex_array(program, vbo, "aPos")uniform = program["time"]uniform.value = 1.0while not glfw.window_should_close(window): now = time.time() vao.render() elapsed = time.time() - now glfw.poll_events() glfw.swap_buffers(window)glfw.terminate()现在它什么也没画。我究竟做错了什么？谢谢！
1 回答
LEATH
TA贡献1936条经验 获得超6个赞
经过的时间是开始时间和当前时间之间的差值。获取应用程序循环之前的开始时间并计算每帧循环中经过的时间：
start_time = time.time()
while not glfw.window_should_close(window):
elapsed = time.time() - start_time
# [...]
制服的值"time"必须在循环中不断更新：
while not glfw.window_should_close(window):
# [...]
uniform.value = elapsed
您必须在应用程序循环中清除每一帧的显示（请参阅ModernGL Context）：
while not glfw.window_should_close(window):
# [...]
context.clear(0.0, 0.0, 0.0)
vao.render()
示例：
import moderngl as mgl
import glfw
import numpy as np
import time
from math import sin
glfw.init()
glfw.window_hint(glfw.CONTEXT_VERSION_MAJOR, 3)
glfw.window_hint(glfw.CONTEXT_VERSION_MINOR, 3)
glfw.window_hint(glfw.OPENGL_PROFILE, glfw.OPENGL_CORE_PROFILE)
window = glfw.create_window(800, 600, "__DELETEME__", None, None)
glfw.make_context_current(window)
context = mgl.create_context()
vertex_source = """
#version 330 core
in vec2 aPos;
uniform float time;
void main() {
gl_Position = vec4(aPos.x, aPos.y + sin(time), 0.0, 1.0);
}
"""
fragment_source = """
#version 330 core
out vec4 color;
void main(){
color = vec4(0.0, 0.0, 1.0, 1.0);
}
"""
program = context.program(vertex_shader=vertex_source, fragment_shader=fragment_source)
data = np.array([
0.5, 0,
-0.5, 0,
0, 0.5], dtype = "float32")
vbo = context.buffer(data.tobytes())
vao = context.vertex_array(program, vbo, "aPos")
uniform = program["time"]
uniform.value = 1.0
start_time = time.time()
while not glfw.window_should_close(window):
elapsed = time.time() - start_time
uniform.value = elapsed
context.clear(0.0, 0.0, 0.0)
vao.render()
glfw.poll_events()
glfw.swap_buffers(window)
glfw.terminate()
添加回答
举报
0/150
提交
取消