// Some codes intializing 'transWidth' and 'transHeight' are ommitted
static vector<GLfloat> pixels;

printf("Alloc: %dx%dx4=%d floatsn", transWidth, transHeight, transWidth * transHeight * 4);
pixels.resize(transWidth * transHeight*4);
// Some codes modifying 'pixels'
// omitted

_CheckErrorGL
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA32F, transWidth, transHeight, 0, GL_RGBA, GL_FLOAT, pixels.data());
_CheckErrorGL

#define _CheckErrorGL {
    GLenum code;
    if ((code = glGetError()) != GL_NO_ERROR)
    {
        printf("Error %d: %sn", int(code), gluErrorString(code));
        assert(false);
    }
}

Ready for OpenGL 2.0
Alloc: 732x737x4=2157936 floats
Alloc: 3168x3224x4=40854528 floats
Alloc: 732x737x4=2157936 floats
Alloc: 3168x3224x4=40854528 floats
Error 1285: 内存不足
Alloc: 6561x1x4=26244 floats
Alloc: 732x737x4=2157936 floats
Alloc: 3168x3224x4=40854528 floats
Error 1285: 内存不足
Alloc: 732x737x4=2157936 floats
Alloc: 3168x3224x4=40854528 floats
Error 1285: 内存不足
Alloc: 6561x1x4=26244 floats

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_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, 0);

glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA32F, transWidth, transHeight, 0, GL_RGBA, GL_FLOAT, pixels.data());