OpenGL纹理在3.3中都是黑色的 - 但在3.1中工作

Question

我目前正在OpenGL3.3中开发一个简单的3D场景,但是在尝试对对象进行纹理处理时 - 所有这些场景的纹理都是黑色的.但是,如果我将上下文版本更改为3.1; 在模型上正确渲染纹理没有问题.

我不确定这是否表明我使用的是被弃用的功能/方法,但我很难看出问题出在哪里.

设置纹理

(load texture from file)
...
glGenTextures(1, &TexID);               // Create The Texture ( CHANGE )
glBindTexture(GL_TEXTURE_2D, TexID);

glTexImage2D(GL_TEXTURE_2D, 0, texture_bpp / 8, texture_width, texture_height, 0, texture_type, GL_UNSIGNED_BYTE, texture_imageData);
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);
...

将纹理绑定到渲染

// mLocation is the layout location in the shader, from glGetUniformLocation
// mTextureUnit is the specified texture unit to load into. Currently using 0.
// mTextureID is the ID of the loaded texture, as generated above.
glActiveTexture( GL_TEXTURE0 + mData.mTextureUnit );
glBindTexture( GL_TEXTURE_2D, mData.mTextureID );
glUniform1i( mLocation, mData.mTextureUnit );

片段着色器

uniform sampler2D diffusemap;
in vec2 passUV;
out vec3 outColour;
...
outColour = texture( diffusemap, passUV ).rgb;

使用的所有纹理都是2的方形尺寸.

---

显示问题的图像.

GL3.1:http://i.imgur.com/NUgj6vA.png

GL3.3:http://i.imgur.com/oOc0jcd.png

---

顶点着色器

#version 330 core

uniform mat4 p;
uniform mat4 v;
uniform mat4 m;

in vec3 vertex;
in vec3 normal;
in vec2 uv;

out vec3 passVertex;
out vec3 passNormal;
out vec2 passUV;

void main( void )
{
    gl_Position = p * v * m * vec4( vertex, 1.0 );

    passVertex = vec3( m * vec4( vertex, 1.0 ) );
    passNormal = vec3( m * vec4( normal, 1.0 ) );
    passUV = uv;
}

Answer 1

在线:

glTexImage2D(GL_TEXTURE_2D, 0, texture_bpp / 8, texture_width, texture_height, 0, texture_type, GL_UNSIGNED_BYTE, texture_imageData);

假设(texture_bpp/8)将返回正确的格式类型是不正确的.它应该是指定内部格式的GLenum值之一,例如GL_RGBA.

将其更正为(或与纹理文件的内部格式匹配的格式)完全解决了问题,并且适用于GL3.3和GL3.1:

glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, texture_width, texture_height, 0, texture_type, GL_UNSIGNED_BYTE, texture_imageData);