我只是尝试使用 WebGL2 渲染场景的深度值,如下所示:
//Texture
depthTexture = gl.createTexture();
gl.bindTexture(gl.TEXTURE_2D, depthTexture);
gl.texImage2D(gl.TEXTURE_2D, 0, gl.DEPTH_COMPONENT24,
width, height, 0,
gl.DEPTH_COMPONENT, gl.UNSIGNED_INT, null);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE);
//FBO
fb = gl.createFramebuffer();
gl.bindFramebuffer(gl.FRAMEBUFFER, fb);
gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.DEPTH_ATTACHMENT, gl.TEXTURE_2D, depthTexture, 0);
gl.bindFramebuffer(gl.FRAMEBUFFER, null);
然后我像这样渲染它:
gl.bindFramebuffer(gl.FRAMEBUFFER, fb);
gl.useProgram(shaderProgram);
//Just a torus...
gl.bindVertexArray(vao);
gl.colorMask(false, false, false, false);
gl.enable(gl.DEPTH_TEST);
gl.clear(gl.DEPTH_BUFFER_BIT);
...
gl.drawElements(gl.TRIANGLES, indices.length, gl.UNSIGNED_SHORT,0);
//Then I draw a full screen quad that simply samples the depth texture
gl.bindFramebuffer(gl.FRAMEBUFFER, null)
....
It seems to work fine, however when sampling the attached depth texture I get what looks like linear depth...
我用来渲染 FBO 的程序非常基础
Vert:
#version 300 es
layout(location = 0) in vec3 position;
uniform mat4 projection;
uniform mat4 view;
uniform mat4 model;
void main() {
gl_Position = projection * view * model * vec4(position, 1.);
}
Frag:
#version 300 es
precision highp float;
layout(location = 0) out vec4 outColor;
void main() {
outColor = vec4(1,0,0,1)
}
我期望深度缓冲区是对数的,即使我不能确定我当前得到的是否真的是线性的,它看起来也不是对数的......
如果它确实是线性的,并且不知怎的,这就是你应该从深度附件中得到的,我对此非常满意,因为我可能需要线性而不是对数深度,但目前我不确定如果这是预期的行为,或者我做错了什么(可能是后者)
Cheers