Question

我正在我的程序中实现阴影贴图，作为中间步骤，我希望能够看到第一次光通过后生成的深度纹理，但是我在屏幕上看到的只是红色，相关代码：< / p>

@Override
protected void render(final double msDelta) {
    super.render(msDelta);

    glEnable(GL_DEPTH_TEST);
    glDepthFunc(GL_LEQUAL);

    //Light pass
    glViewport(0, 0, 4096, 4096);
    ...

    //Draw pass
    glViewport(0, 0, screenWidth, screenHeight);
    ...

    //Visualize depth texture
    if (visualDepthTexture) {
        glViewport(100, screenHeight - (screenHeight / 5) - 100, screenWidth / 5, screenHeight / 5);
        glClearDepthf(1f);
        glClear(GL_DEPTH_BUFFER_BIT);
        glActiveTexture(GL_TEXTURE0);
        depthTexture.bind();
        glDrawBuffer(GL_BACK);
        depthBox.draw(0);
        depthTexture.unbind();
    }
}

其中depthTexture：

    //shadow FBO and texture
    depthFBO = new FrameBufferObject().create().bind();
    depthTexture = new Texture2D().create().bind()
            .storage2D(11, GL_DEPTH_COMPONENT32F, 4096, 4096)   //11 is log2(4096)
            .minFilter(GL_LINEAR)
            .magFilter(GL_LINEAR)
            .compareMode(GL_COMPARE_REF_TO_TEXTURE)
            .compareFunc(GL_LEQUAL);
    depthFBO.texture2D(GL_DEPTH_ATTACHMENT, GL11.GL_TEXTURE_2D, depthTexture, 0)
            .unbind();
    depthTexture.unbind();

depthBox.draw(0)将使用以下着色器在GL_TRIANGLES模式下绘制6个顶点：

depth-box.vs.glsl

#version 430 core

void main(void) {
    const vec4 vertices[6] = vec4[](
        vec4(-1.0, -1.0, 1.0, 1.0),
        vec4(-1.0, 1.0, 1.0, 1.0),
        vec4(1.0, 1.0, 1.0, 1.0),

        vec4(1.0, 1.0, 1.0, 1.0),
        vec4(1.0, -1.0, 1.0, 1.0),
        vec4(-1.0, -1.0, 1.0, 1.0)
    ); 

    gl_Position = vertices[gl_VertexID];
}

depth-box.fs.glsl

#version 430 core

layout(binding = 0) uniform sampler2D shadow_tex;

out vec4 color;

void main(void) {
    color = vec4(texture2D(shadow_tex, gl_FragCoord.xy));
}

我想要实现的是深度纹理被转换为灰度（以查看阴影应该出现的位置），并且小视口中的两个三角形会得到该结果的纹理。

使用深度纹理纹理两个三角形（矩形）会产生所有红色

0 个答案: