Question

我尝试使用GLSL进行立方体贴图。但是，该物体是黑色的。

为什么物体无法遮挡？

补充：

可以阅读图像。

projectionMatrix，viewMatrix和baseColor正在运行。

glCreateTextures(GL_TEXTURE_CUBE_MAP, 1, &_texture);
glActiveTexture(GL_TEXTURE1); // add
glBindTexture(GL_TEXTURE_CUBE_MAP, _texture);
QImage posx;
bool complateLoadCubeMapPosX = posx.load(("D:/posx.jpg"));
assert(complateLoadCubeMapPosX);

QImage negx;
bool complateLoadCubeMapNegX = negx.load(("D:/negx.jpg"));
assert(complateLoadCubeMapNegX);

QImage posy;
bool complateLoadCubeMapPosY = posy.load(("D:/posy.jpg"));
assert(complateLoadCubeMapPosY);

QImage negy;
bool complateLoadCubeMapNegY = negy.load(("D:/negy.jpg"));
assert(complateLoadCubeMapNegY);

QImage posz;
bool complateLoadCubeMapPosZ = posz.load(("D:/posz.jpg"));
assert(complateLoadCubeMapPosZ);

QImage negz;
bool complateLoadCubeMapNegZ = negz.load(("D:/negz.jpg"));
assert(complateLoadCubeMapNegZ);
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MAG_FILTER, GL_LINEAR);     // add
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_FILTER, GL_LINEAR);     // add
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);  // add
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);  // add
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_EDGE);  // add
glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X, 0, GL_RGB, posx.width(), posx.height(), 0, GL_RGBA, GL_UNSIGNED_BYTE, posx.bits());
glTexImage2D(GL_TEXTURE_CUBE_MAP_NEGATIVE_X, 0, GL_RGB, negx.width(), negx.height(), 0, GL_RGBA, GL_UNSIGNED_BYTE, negx.bits());
glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_Y, 0, GL_RGB, posy.width(), posy.height(), 0, GL_RGBA, GL_UNSIGNED_BYTE, posy.bits());
glTexImage2D(GL_TEXTURE_CUBE_MAP_NEGATIVE_Y, 0, GL_RGB, negy.width(), negy.height(), 0, GL_RGBA, GL_UNSIGNED_BYTE, negy.bits());
glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_Z, 0, GL_RGB, posz.width(), posz.height(), 0, GL_RGBA, GL_UNSIGNED_BYTE, posz.bits());
glTexImage2D(GL_TEXTURE_CUBE_MAP_NEGATIVE_Z, 0, GL_RGB, negz.width(), negz.height(), 0, GL_RGBA, GL_UNSIGNED_BYTE, negz.bits());

glBindTexture(GL_TEXTURE_CUBE_MAP, 0);
glActiveTexture(GL_TEXTURE0); // add
MaterialManager::getInstance().createProgram("cubemap");

渲染代码：

    GLuint program = MaterialManager::getInstance().getShader("cubemap");
    glUseProgram(program);
    glUniformMatrix4fv(glGetUniformLocation(program, "projMat"), 1, GL_FALSE, projectionMatrix.data());
    glUniformMatrix4fv(glGetUniformLocation(program, "viewMat"), 1, GL_FALSE, viewMatrix.data());
    glUniform4f(glGetUniformLocation(program, "baseColor"), 0.8f, 0.8f, 0.8f, 1.0f);
    glUniform1i(glGetUniformLocation(program, "envMap"), 1); // change
    glBindVertexArray(_vao);
    glActiveTexture(GL_TEXTURE1); // add
    glBindTexture(GL_TEXTURE_CUBE_MAP, _texture); // add
    glDrawArrays(GL_TRIANGLES, 0, _normals.size());
    glActiveTexture(GL_TEXTURE0); // add
    glBindVertexArray(0);

Fragment Shader：

#version 450
#extension GL_NV_shadow_samplers_cube : enable
in vec4 position;
in vec3 normal;
out vec4 out_color;
uniform vec4 baseColor;
uniform samplerCube envMap;
...
void main()
{
    out_color = vec4(textureCube(envMap, vec3(1.0, 0.0, 0.0)).rgb, 1.0);
}

current result

Answer 1

您将_texture绑定为制服（envMap），但该制服应包含纹理单元。另外，我也没有看到你在渲染时绑定了_texture（缺少glBindTexture(GL_TEXTURE_CUBE_MAP, _texture);）

此外，您在创建纹理时未设置采样器参数：

glTexParameteri( GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MAG_FILTER, GL_LINEAR );
glTexParameteri( GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_FILTER, GL_LINEAR );
glTexParameteri( GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE );
glTexParameteri( GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE );
glTexParameteri( GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_EDGE );

使用GLSL进行立方体贴图

1 个答案: