现在我有了这个网站生成的噪声纹理：https ://aeroson.github.io/rgba-noise-image-generator/ 。我想在我的计算着色器中使用 4 个统一采样器从单个噪声纹理中获取 4 个随机 rgba 值。我的计算着色器源代码如下所示：
#version 430 core
layout (local_size_x = 1, local_size_y = 1, local_size_z = 1) in;
uniform sampler2D noise_r0;
uniform sampler2D noise_i0;
uniform sampler2D noise_r1;
uniform sampler2D noise_i1;
layout (binding = 0, rgba32f) writeonly uniform image2D tilde_h0k;
layout (binding = 1, rgba32f) writeonly uniform image2D tilde_h0minusk;
uniform int N = 256;
....
// Box-Muller algorithm
vec2 texCoord = vec2(gl_GlobalInvocationID.xy) / float(N); // Here every invocation refers to a pixel of output image
float noise00 = clamp(texture(noise_r0, texCoord).r, 0.001, 1.0);
float noise01 = clamp(texture(noise_i0, texCoord).r, 0.001, 1.0);
float noise02 = clamp(texture(noise_r1, texCoord).r, 0.001, 1.0);
float noise03 = clamp(texture(noise_i1, texCoord).r, 0.001, 1.0);
....
在主程序中，我使用此代码将下载的噪声纹理上传到计算着色器：
unsigned int tex_noise;
glGenTextures(1, &tex_noise);
glBindTexture(GL_TEXTURE_2D, tex_noise);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
int w_noise, h_noise, nrChannels;
unsigned char* data = stbi_load("noise.png", &w_noise, &h_noise, &nrChannels, 0);
if (data) {
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, w_noise, h_noise, 0, GL_RGBA, GL_UNSIGNED_BYTE, data);
glGenerateMipmap(GL_TEXTURE_2D);
}
else std::cout << "Failed to load noise texture." << std::endl;
stbi_image_free(data);
....
....
我的问题是：我可以使用此代码在计算着色器中设置那些 sampler2D 吗？
glUseProgram(computeProgram);
glActiveTexture(GL_TEXTURE1);
glUniform1i(glGetUniformLocation(computeProgram, "noise_r0"), 1);
glActiveTexture(GL_TEXTURE2);
glUniform1i(glGetUniformLocation(computeProgram, "noise_i0"), 2);
glActiveTexture(GL_TEXTURE3);
glUniform1i(glGetUniformLocation(computeProgram, "noise_r1"), 3);
glActiveTexture(GL_TEXTURE4);
glUniform1i(glGetUniformLocation(computeProgram, "noise_i1"), 4);
如果是错误的，我应该如何设置这些 sampler2D，并确保我从这些 sampler2D 获得的随机 rgba 值不一样？（因为如果它们相同，Box-Muller 算法将不起作用）。非常感谢你的帮助！
制服的类型是ìmage2D，不是sampler2D。要加载和存储图像，您必须使用 . 将纹理绑定到图像单元glBindImageTexture。请参阅图像加载存储。例如：
glBindImageTexture(1, tex_noise, 0, GL_FALSE, 0, GL_WRITE_ONLY, GL_RGBA32F);
如果要将纹理绑定到纹理单元，则需要选择活动纹理单元，glActiveTexture然后将纹理绑定glBindTexture：
glActiveTexture(GL_TEXTURE1);
glBindTexture(GL_TEXTURE_2D, texture_object);
您可以使用统一的类型sampler2D和texture*功能在着色器中访问此纹理：
layout(binding = 1) uniform sampler2D myTextue;
如果要将纹理绑定到图像单元，则必须使用glBindImageTexture：
glBindImageTexture(1, texture_object, 0, GL_FALSE, 0, GL_WRITE_ONLY, GL_RGBA32F);
您可以使用统一的类型iamge2D和image*函数在着色器中访问此纹理：
layout (binding = 1, rgba32f) writeonly uniform image2D myImage;
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我来说两句