按照http://en.wikibooks.org/wiki/OpenGL_Programming/Modern_OpenGL_Tutorial_06上的教程，我正在尝试使用图形
问题：当我尝试纹理我的立方体时，我的样本是黑色的 .
截图：http://puu.sh/2JP1H.jpg（注意：我设置blue = uv.x来测试我的UV）
我查看了线程OpenGL textures appear just black和Texture is all black，但似乎它们有不同的问题 .
首先，我使用SOIL图像加载库加载我的纹理：
int w, h;
unsigned char* img = SOIL_load_image("resources/images/4x4window.jpg",&w,&h,0,0);
ErrorIf(!img, "%s", SOIL_last_result());
glGenTextures(1, &texture_id);
glBindTexture(GL_TEXTURE, texture_id);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexImage2D(GL_TEXTURE_2D,0,GL_RGB,w,h,0,GL_RGB,GL_UNSIGNED_BYTE,img);
我的渲染函数，我将纹理传递给着色器程序：
void onDisplay()
{
glClearColor(1.0, 1.0, 1.0, 1.0);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glUseProgram(program);
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, texture_id);
glUniform1i(uniform_myTexture, /*GL_TEXTURE*/0);
glEnableVertexAttribArray(attribute_coord3d); // open shader var
glBindBuffer(GL_ARRAY_BUFFER, vbo_cube_verts); // put stuff in buffer
glVertexAttribPointer(attribute_coord3d, 3, GL_FLOAT, GL_FALSE, 0, 0); //send
glEnableVertexAttribArray(attribute_texcoord);
glBindBuffer(GL_ARRAY_BUFFER, vbo_cube_texcoords);
glVertexAttribPointer(attribute_texcoord, 2, GL_FLOAT, GL_FALSE, 0, 0);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, ibo_cube_elements);
int size;
glGetBufferParameteriv(GL_ELEMENT_ARRAY_BUFFER, GL_BUFFER_SIZE, &size);
glDrawElements(GL_TRIANGLES, size / sizeof(GLushort), GL_UNSIGNED_SHORT, 0);
glDisableVertexAttribArray(attribute_coord3d);
glDisableVertexAttribArray(attribute_texcoord);
glutSwapBuffers();
}
顶点着色器：
attribute vec3 coord3d;
attribute vec2 texcoord;
varying vec2 f_texcoord;
uniform mat4 mvp;
void main(void)
{
gl_Position = mvp * vec4(coord3d, 1.0);
f_texcoord = texcoord;
}
片段着色器：
varying vec2 f_texcoord;
uniform sampler2D mytexture;
void main(void)
{
vec4 result = texture2D(mytexture, f_texcoord);
result.z = f_texcoord.x;
result.w = 1;
gl_FragColor = result;
}
1 回答
纹理绑定的行是：
应该是：