使用程序生成来创建磁盘，但纹理无法正常工作

Question

[较早地在一个问题中将其发布为两个问题。决定一次解决一个问题以减少代码壁]

proeceduralgeneration.cpp

void proeceduralgeneration::renderdisk(int sides)
{
    float interval = ( 2 * PI )/sides;
    float angle = 0.0f;
    myTexture = SOIL_load_OGL_texture

    (
        "gfx/ground.png",//texture link 
        SOIL_LOAD_AUTO,
        SOIL_CREATE_NEW_ID,
        SOIL_FLAG_MIPMAPS | SOIL_FLAG_NTSC_SAFE_RGB | SOIL_FLAG_COMPRESS_TO_DXT
    );
    glBegin(GL_TRIANGLES);
    for (int i = 0; i < sides; i++)
    {
        glBindTexture(GL_TEXTURE_2D, myTexture);
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR)
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR)
        glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
        glTexCoord2f(0.5, -0.5);
        glVertex3f(0, 0, 0);

        glTexCoord2f(cos(angle) / 2 + 0.5, - (sin(angle) / 2 + 0.5));
        glVertex3f(cos(angle), sin(angle), 0);

        glTexCoord2f(cos(angle + interval) / 2 + 0.5, -(sin(angle + interval) / 2 - 0.5));
        glVertex3f(cos(angle + interval), sin(angle + interval), 0);

        angle += interval;
    }
    glVertex3f(cos(0), sin(0), 0);
    glEnd();
    }

磁盘可以渲染，但是纹理不能正常渲染。编辑后提示磁盘未正确纹理image of disk in test enviroment

Answer 1

GL_TEXTURE_MAG_FILTERcannot beGL_LINEAR_MIPMAP_LINEAR。它应该是GL_LINEAR。因此，请替换此行：

glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR_MIPMAP_LINEAR);

with

glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);

Answer 2

无论如何，您都会收到OpenGL错误。在glBindTexture序列中不允许分别使用glTexParameteri，glTexEnvf和glBegin/glEnd。仅允许修改属性或指定顶点的指令。绑定纹理并在glBegin之前设置纹理参数：

glEnd