GLSL共享深度緩衝區似乎不工作

Question

我正在嘗試爲兩個FBOS使用共享深度紋理，當我進行平鋪前向着色時。我正在做的是一個prez pass，填充深度緩衝區，然後我運行一個計算着色器來做一些calculatons，然後運行我的向前着色器，在那裏我嘗試渲染一個共享該深度緩衝區的FBO，有一個顏色緩衝區。問題是屏幕變黑。以下是我initalize兩個宗教組織：

void MainWindow::initalizeTiledForwardPrePassBuffer(int width, int height) 
{ 
glGenFramebuffers(1,&m_prePassBuffer); 
glBindFramebuffer(GL_FRAMEBUFFER,m_prePassBuffer); 

glGenTextures(1,&m_depthTexture); 
glGenTextures(1,&m_finalTexture); 

// depth 
glBindTexture(GL_TEXTURE_2D, m_depthTexture); 
glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT32F, width, height, 0, GL_DEPTH_COMPONENT, GL_FLOAT, NULL); 
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); 
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); 
glFramebufferTexture2D(GL_DRAW_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D, m_depthTexture, 0); 


glBindTexture(GL_TEXTURE_2D, m_otherTexture); 
///Used to be GL_RGBA only 
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); 
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); 
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA32F, width, height, 0, GL_RGB, GL_FLOAT, NULL); 
glFramebufferTexture2D(GL_DRAW_FRAMEBUFFER, GL_COLOR_ATTACHMENT5, GL_TEXTURE_2D, m_otherTexture, 0); 

// final 
glBindTexture(GL_TEXTURE_2D, m_finalTexture); 
///Used to be GL_RGBA only 
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); 
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); 
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA32F, width, height, 0, GL_RGB, GL_FLOAT, NULL); 
glFramebufferTexture2D(GL_DRAW_FRAMEBUFFER, GL_COLOR_ATTACHMENT4, GL_TEXTURE_2D, m_finalTexture, 0); 

GLenum Status = glCheckFramebufferStatus(GL_FRAMEBUFFER); 

if (Status != GL_FRAMEBUFFER_COMPLETE) { 
    printf("FB error, status: 0x%x\n", Status); 
} 

glBindFramebuffer(GL_FRAMEBUFFER, 0); 
} 
    void MainWindow::initializeTiledForwardColorBuffer(int width, int height) 
    { 
    glGenFramebuffers(1,&m_forwardColorBuffer); 
    glBindFramebuffer(GL_FRAMEBUFFER,m_forwardColorBuffer); 

glGenTextures(1,&m_forwardColorTexture); 

glBindTexture(GL_TEXTURE_2D,m_forwardColorTexture); 
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); 
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); 
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA32F, width, height, 0, GL_RGB, GL_FLOAT, NULL); 
glFramebufferTexture2D(GL_DRAW_FRAMEBUFFER, GL_COLOR_ATTACHMENT14, GL_TEXTURE_2D, m_forwardColorTexture, 0); 

// depth 
glBindTexture(GL_TEXTURE_2D, m_depthTexture); 
glFramebufferTexture2D(GL_DRAW_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D, m_depthTexture, 0); 

GLenum Status = glCheckFramebufferStatus(GL_FRAMEBUFFER); 

if (Status != GL_FRAMEBUFFER_COMPLETE) { 
    printf("FB error, status: 0x%x\n", Status); 
} 

glBindFramebuffer(GL_FRAMEBUFFER, 0); 
} 

這裏是我的前ž通：

ShaderMan.useTiledForwardPrePass(); 

///bind the prepasbuffer for drawing 
bindTiledForwardPrePassBuffer(); 

///enable depth test and clear the buffers and then render the scene 
glDepthMask(GL_TRUE); 
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); 
glEnable(GL_DEPTH_TEST); 

//renderSceneToDepth(); 
renderOtherSceneToDepth(); 

glDepthMask(GL_FALSE); 
glDisable(GL_DEPTH_TEST); 

而且直傳

ShaderMan.useForwardShader(); 
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, m_forwardColorBuffer); 

    //glBindImageTexture(4, m_forwardColorTexture, 0, GL_FALSE, 0, GL_WRITE_ONLY,  GL_RGBA32F); 
GLenum DrawBuffers[] = { 
    GL_COLOR_ATTACHMENT14 
}; 
glDrawBuffers(ARRAY_SIZE_IN_ELEMENTS(DrawBuffers), DrawBuffers); 

glDepthMask(GL_FALSE); 
glClear(GL_COLOR_BUFFER_BIT); 
glEnable(GL_DEPTH_TEST); 
//bindMSAABufferForWriting(); 
bindForForwardPass(); 
//renderSceneForward(); 
renderOtherSceneForward(); 

glDepthMask(GL_FALSE); 
glDisable(GL_DEPTH_TEST); 

glBindFramebuffer(GL_DRAW_FRAMEBUFFER,0); 
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); 

glBindFramebuffer(GL_READ_FRAMEBUFFER,m_forwardColorBuffer); 

glReadBuffer(GL_COLOR_ATTACHMENT14); 
glBlitFramebuffer(0, 0, window_width, window_height, 
        0, 0, window_width, window_height, GL_COLOR_BUFFER_BIT, GL_LINEAR); 

我嘗試寫入色緩衝器的方式片段着色器只是用

//Other code..... 
layout(location = 0)out vec3 finalColor; 
void main() 
{ 
    //Other code... 
    finalColor = vec3(color).xyz; 
} 

UPDATE

下面是完整的預通着色器 的#Version 430

layout(location = 0)in vec3 position; 

uniform mat4 modelViewProjection; 

void main() 
{ 
    gl_Position = modelViewProjection*vec4(position,1.0f); 
} 

#version 430 


void main() 
{ 

} 

我該如何綁定前傳緩衝區

void MainWindow::bindTiledForwardPrePassBuffer() 
{ 
    glBindFramebuffer(GL_DRAW_FRAMEBUFFER,m_prePassBuffer); 
} 

ANSWER

問題顯然是我的圖形卡沒有支持14渲染目標，所以當我將紋理從GL_COLOR_ATTACHMENT14更改爲GL_COLOR_ATTACHMENT1時，所有內容都按預期工作

Answer 1

首先，您正確地使用了 layout（location = 0）out vec3 finalColor;

0代表drawBuffer []數組中的索引。很抱歉的錯誤...

更新：

我沒有看到你綁定你的附件插槽，前置通

GLenum DrawBuffers[] = { 
    GL_COLOR_ATTACHMENT4 , GL_COLOR_ATTACHMENT5, GL_DEPTH_ATTACHMENT 
}; 
glDrawBuffers(ARRAY_SIZE_IN_ELEMENTS(DrawBuffers), DrawBuffers); 

另外在預通着色器，你不綁定所有的根據DrawBuffer Array 的附件是否是您的片段着色器爲空？

layout(location = 0)out vec3 color4; 
layout(location = 1)out vec3 color5; 
layout(location = 2)out float fragmentdepth; 

void main() 
{ 
    //output something per fragment!! 
} 

此外，如果你打算使用您的深度紋理作爲輸入到你的着色器，你應該有， 相應的制服，難道我錯了嗎？