多重采样帧缓冲区仅适用于 Nvidia 卡，而不是 AMD 或 Intel HD Graphics

Question

该程序仅使用 Nvidia 显卡渲染帧缓冲区。我用 AMD 和 Intel 测试过相同的版本，它显示为黑色。

我创建了帧缓冲区：

enum FBOIDS
{
    FBO,
    FBO_MS,
    TEXTURE,
    TEXTURE_MS,
    RBO,
    RBO_MS
};
unsigned int ID[6];

glGenFramebuffers(1, &ID[FBO_MS]);
glBindFramebuffer(GL_FRAMEBUFFER, ID[FBO_MS]);

// generate texture
glGenTextures(1, &ID[TEXTURE_MS]);
glBindTexture(GL_TEXTURE_2D_MULTISAMPLE, ID[TEXTURE_MS]);
glTexImage2DMultisample(GL_TEXTURE_2D_MULTISAMPLE, smaa, GL_RGBA, 1, 1, GL_TRUE);
glBindTexture(GL_TEXTURE_2D_MULTISAMPLE, 0);

// attach it to currently bound framebuffer object
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D_MULTISAMPLE, ID[TEXTURE_MS], 0);

glGenRenderbuffers(1, &ID[RBO_MS]);
glBindRenderbuffer(GL_RENDERBUFFER, ID[RBO_MS]);
glRenderbufferStorageMultisample(GL_RENDERBUFFER, smaa, GL_DEPTH24_STENCIL8, 1, 1);
glBindRenderbuffer(GL_RENDERBUFFER, 0);

glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_STENCIL_ATTACHMENT, GL_RENDERBUFFER, ID[RBO_MS]);

//========================================================================

glGenFramebuffers(1, &ID[FBO]);
glBindFramebuffer(GL_FRAMEBUFFER, ID[FBO]);

// generate texture
glGenTextures(1, &ID[TEXTURE]);
glBindTexture(GL_TEXTURE_2D, ID[TEXTURE]);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB8, 1, 1, 0, GL_RGB, GL_UNSIGNED_BYTE, 0);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glBindTexture(GL_TEXTURE_2D, 0);

glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, ID[TEXTURE], 0);

glGenRenderbuffers(1, &ID[RBO]);
glBindRenderbuffer(GL_RENDERBUFFER, ID[RBO]);
glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH24_STENCIL8, 1, 1);
glBindRenderbuffer(GL_RENDERBUFFER, 0);

glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_STENCIL_ATTACHMENT, GL_RENDERBUFFER, ID[RBO]);

我是这样画的：

// =========================================
//=== Update tex
glBindFramebuffer(GL_FRAMEBUFFER, ID[FBO_MS]);

glBindTexture(GL_TEXTURE_2D_MULTISAMPLE, ID[TEXTURE_MS]);
glTexImage2DMultisample(GL_TEXTURE_2D_MULTISAMPLE, smaa, GL_RGB8, size.x, size.y, GL_TRUE);
glBindTexture(GL_TEXTURE_2D_MULTISAMPLE, 0);

// attach it to currently bound framebuffer object
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D_MULTISAMPLE, ID[TEXTURE_MS], 0);

glBindRenderbuffer(GL_RENDERBUFFER, ID[RBO_MS]);
glRenderbufferStorageMultisample(GL_RENDERBUFFER, smaa, GL_DEPTH24_STENCIL8, size.x, size.y);
glBindRenderbuffer(GL_RENDERBUFFER, 0);

glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_STENCIL_ATTACHMENT, GL_RENDERBUFFER, ID[RBO_MS]);

//========================================================================

glBindFramebuffer(GL_FRAMEBUFFER, ID[FBO]);

// generate texture
glBindTexture(GL_TEXTURE_2D, ID[TEXTURE]);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB8, size.x, size.y, 0, GL_RGB, GL_UNSIGNED_BYTE, 0);
glBindTexture(GL_TEXTURE_2D, 0);

glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, ID[TEXTURE], 0);

glBindRenderbuffer(GL_RENDERBUFFER, ID[RBO]);
glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH24_STENCIL8, size.x, size.y);
glBindRenderbuffer(GL_RENDERBUFFER, 0);

glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_STENCIL_ATTACHMENT, GL_RENDERBUFFER, ID[RBO]);

glBindFramebuffer(GL_FRAMEBUFFER, ID[FBO_MS]);

glBindFramebuffer(GL_READ_FRAMEBUFFER, ID[FBO_MS]);
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, ID[FBO]);
glBlitFramebuffer(0, 0, size.x, size.y, 0, 0, size.x, size.y, GL_COLOR_BUFFER_BIT, GL_NEAREST);

glBindFramebuffer(GL_FRAMEBUFFER, 0);

Github 问题的图片链接：https://github.com/christt105/Elit3D/issues/40

Program on AMD or Intel HD Graphics Program on Nvidia

Answer 1

问题已解决。问题是我设置了更多 GPU 可以承受的样本。我使用glGetIntegerv(GL_MAX_SAMPLES, &maxSamples); 来获取最大样本数。