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我试图让多重纹理工作并且到目前为止已经使用这个功能加载了多重纹理

def loadTexture(name):

    img = PIL.Image.open(name) # .jpg, .bmp, etc. also work
    img_data = numpy.array(list(img.getdata()), numpy.int8)

    id = glGenTextures(1)
    glPixelStorei(GL_UNPACK_ALIGNMENT,1)
    glBindTexture(GL_TEXTURE_2D, id)
    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP)
    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP)
    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR)
    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR)
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, img.size[0], img.size[1], 0, GL_RGB, GL_UNSIGNED_BYTE, img_data)
    return id

我可以设置纹理以使用此代码

glBindTexture(GL_TEXTURE_2D, 1)
glEnable(GL_TEXTURE_2D)

我的第一次尝试是这样的：

glBindTexture(GL_TEXTURE_2D, 1)
glEnable(GL_TEXTURE_2D)
glBegin(GL_TRIANGLES)
....
glEnd()

glBindTexture(GL_TEXTURE_2D, 3)
glEnable(GL_TEXTURE_2D)
glBegin(GL_TRIANGLES)
....
glEnd()

所以我渲染多边形两次并每次选择不同的纹理，这似乎与调用 glBindTexture(GL_TEXTURE_2D, n) 将选择相关纹理并渲染但本身没有混合，我只是查看渲染中最后选择的纹理。我试过添加 glEnable(GL_BLEND)，但这似乎没有任何作用。

我想做的是将两个通道的像素加在一起

我该怎么办？

4

1 回答 1

2

你确定你需要多张通行证吗？这是一个普通的老式 OpenGL 多纹理示例：

import pygame
from pygame.locals import *

import numpy
import numpy.linalg

from OpenGL.GL import *
from OpenGL.GL.shaders import *

RESOLUTION = (800,600)

POSITIONS = numpy.array([[-1.0, -1.0], [+1.0, -1.0], [-1.0, +1.0], [+1.0, +1.0]], dtype=numpy.float32)
TEXCOORDS = numpy.array([[0.0, 1.0], [1.0, 1.0], [0.0, 0.0], [1.0, 0.0]], dtype=numpy.float32)

from PIL import Image

tex0 = 0
tex1 = 0

def loadTexture(path):
    img = Image.open(path)
    img = img.convert("RGBA") 
    img_data = numpy.array(list(img.getdata()), numpy.int8)

    texture = glGenTextures(1)
    glPixelStorei(GL_UNPACK_ALIGNMENT,1)
    glBindTexture(GL_TEXTURE_2D, texture)
    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP)
    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP)
    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR)
    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR)
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, img.size[0], img.size[1], 0, GL_RGBA, GL_UNSIGNED_BYTE, img_data)

    return texture

def init():
    global tex0
    global tex1

    tex0 = loadTexture("texture0.png")
    tex1 = loadTexture("texture1.png")

    glViewport(0, 0, *RESOLUTION)

    aspect = RESOLUTION[0]/float(RESOLUTION[1])

    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    glOrtho(-aspect, +aspect, -1.0, +1.0, -1.0, +1.0);

    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();

    glClearColor(0.0, 0.0, 0.0, 1.0);

    glVertexPointer(2, GL_FLOAT, 0, POSITIONS);
    glEnableClientState(GL_VERTEX_ARRAY);

    glClientActiveTexture(GL_TEXTURE0);
    glTexCoordPointer(2, GL_FLOAT, 0, TEXCOORDS); 
    glEnableClientState(GL_TEXTURE_COORD_ARRAY);

    glClientActiveTexture(GL_TEXTURE1);
    glTexCoordPointer(2, GL_FLOAT, 0, TEXCOORDS);
    glEnableClientState(GL_TEXTURE_COORD_ARRAY);

def draw():
    glClear(GL_COLOR_BUFFER_BIT);

    glActiveTexture(GL_TEXTURE0);
    glEnable(GL_TEXTURE_2D);
    glBindTexture(GL_TEXTURE_2D, tex0);
    glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);

    glActiveTexture(GL_TEXTURE1);
    glEnable(GL_TEXTURE_2D);
    glBindTexture(GL_TEXTURE_2D, tex1);
    glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);

    glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);

def main():
    pygame.init()

    screen = pygame.display.set_mode(RESOLUTION, OPENGL | DOUBLEBUF)

    init()

    while True:
        for event in pygame.event.get():
            if event.type == QUIT: return

        draw()

        pygame.display.flip()

if __name__ == "__main__":
    main()

看看Texture Combiners，它们可能会启用您正在寻找的效果类型。当然，如今这类事物的最先进技术是着色器。

于 2012-02-26T16:40:24.727 回答