关于纹理混合

xiongbincsu

我做的纹理混合为什么只混合了前两个单元,后面的第三个单元混合不进去是为什么?
主要代码如下: 大家给点意见::
    glActiveTextureARB( GL_TEXTURE0_ARB );
    glEnable( GL_TEXTURE_2D );
    glBindTexture( GL_TEXTURE_2D, texture[0] );
    glTexEnvi( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE );

    glActiveTextureARB(GL_TEXTURE1_ARB );
    glEnable( GL_TEXTURE_2D );
    glBindTexture( GL_TEXTURE_2D, texture[1]);

    glTexEnvi( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE_ARB );
    glTexEnvi( GL_TEXTURE_ENV, GL_COMBINE_RGB_ARB, GL_INTERPOLATE_ARB );

    glTexEnvi( GL_TEXTURE_ENV, GL_SOURCE0_RGB_ARB, GL_PREVIOUS_ARB );
    glTexEnvi( GL_TEXTURE_ENV, GL_OPERAND0_RGB_ARB, GL_SRC_COLOR );

    glTexEnvi( GL_TEXTURE_ENV, GL_SOURCE1_RGB_ARB, GL_TEXTURE );
    glTexEnvi( GL_TEXTURE_ENV, GL_OPERAND1_RGB_ARB, GL_SRC_COLOR );

    glTexEnvi( GL_TEXTURE_ENV, GL_SOURCE2_RGB_ARB,  GL_PRIMARY_COLOR_ARB);
    glTexEnvi( GL_TEXTURE_ENV, GL_OPERAND2_RGB_ARB, GL_SRC_COLOR );

    glActiveTextureARB( GL_TEXTURE2_ARB );
    glEnable( GL_TEXTURE_2D );
    glBindTexture( GL_TEXTURE_2D, texture[2] );

        glTexEnvi( GL_TEXTURE_ENV, GL_COMBINE_RGB_ARB,  GL_REPLACE );

    glTexEnvi( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE_ARB );
    glTexEnvi( GL_TEXTURE_ENV, GL_COMBINE_RGB_ARB,  GL_INTERPOLATE_ARB );

    glTexEnvi( GL_TEXTURE_ENV, GL_SOURCE0_RGB_ARB,  GL_TEXTURE0_ARB );
    glTexEnvi( GL_TEXTURE_ENV, GL_OPERAND0_RGB_ARB, GL_SRC_COLOR );

    glTexEnvi( GL_TEXTURE_ENV, GL_SOURCE1_RGB_ARB,  GL_TEXTURE );
    glTexEnvi( GL_TEXTURE_ENV, GL_OPERAND1_RGB_ARB, GL_SRC_COLOR );
       
        glTexEnvi( GL_TEXTURE_ENV, GL_SOURCE2_RGB_ARB,  GL_PRIMARY_COLOR_ARB); //GL_PRIMARY_COLOR_ARB
        glTexEnvi( GL_TEXTURE_ENV, GL_OPERAND2_RGB_ARB, GL_SRC_ALPHA );

        //在次加入绘图部分
        glTranslatef(-0.30f,-0.50f,-2.0f);
       
        glColor4f(1.0f,0.0f,0.0f,0.5);
        glBegin(GL_QUADS);
                glNormal3f(0.0,0.0,1.0f);
                glMultiTexCoord2fARB(GL_TEXTURE0_ARB,0.0,0.0);
                glMultiTexCoord2fARB(GL_TEXTURE1_ARB,0.0,0.0);
                glMultiTexCoord2fARB(GL_TEXTURE2_ARB,0.0,0.0);
                glVertex3f(0.0f,0.0f,0.0f);

                glNormal3f(0.0,0.0,1.0f);
                glMultiTexCoord2fARB(GL_TEXTURE0_ARB,0.0,1.0);
                glMultiTexCoord2fARB(GL_TEXTURE1_ARB,0.0,1.0);
                glMultiTexCoord2fARB(GL_TEXTURE2_ARB,0.0,1.0);
                glVertex3f(0.0f,1.0f,0.0f);

                glNormal3f(0.0,0.0,1.0f);
                glMultiTexCoord2fARB(GL_TEXTURE0_ARB,1.0,1.0);
                glMultiTexCoord2fARB(GL_TEXTURE1_ARB,1.0,1.0);
                glMultiTexCoord2fARB(GL_TEXTURE2_ARB,1.0,1.0);
                glVertex3f(1.0f,1.0f,0.0f);

                glNormal3f(0.0,0.0,1.0f);
                glMultiTexCoord2fARB(GL_TEXTURE0_ARB,1.0,0.0);
                glMultiTexCoord2fARB(GL_TEXTURE1_ARB,1.0,0.0);
                glMultiTexCoord2fARB(GL_TEXTURE2_ARB,1.0,0.0);
                glVertex3f(1.0f,0.0f,0.0f);
        glEnd();

显卡有8个纹理单元

peter711

关注

jk20012001

显卡不支持吧？（比如MX系列）

juedno2004

用 shader 省心.