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Improved computation of framebuffer memory usage

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This commit is contained in:
Bruno Herbelin
2022-05-23 00:45:54 +02:00
parent 81704c08c9
commit 944778175a
2 changed files with 37 additions and 29 deletions
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65
FrameBuffer.cpp
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@@ -76,7 +76,7 @@ glm::ivec2 FrameBuffer::getParametersFromResolution(glm::vec3 res)
}
FrameBuffer::FrameBuffer(glm::vec3 resolution, FrameBufferFlags flags): flags_(flags),
textureid_(0), multisampling_textureid_(0), framebufferid_(0), multisampling_framebufferid_(0)
textureid_(0), multisampling_textureid_(0), framebufferid_(0), multisampling_framebufferid_(0), mem_usage_(0)
{
attrib_.viewport = glm::ivec2(resolution);
setProjectionArea(glm::vec2(1.f, 1.f));
@@ -86,7 +86,7 @@ FrameBuffer::FrameBuffer(glm::vec3 resolution, FrameBufferFlags flags): flags_(f
}
FrameBuffer::FrameBuffer(uint width, uint height, FrameBufferFlags flags): flags_(flags),
textureid_(0), multisampling_textureid_(0), framebufferid_(0), multisampling_framebufferid_(0)
textureid_(0), multisampling_textureid_(0), framebufferid_(0), multisampling_framebufferid_(0), mem_usage_(0)
{
attrib_.viewport = glm::ivec2(width, height);
setProjectionArea(glm::vec2(1.f, 1.f));
@@ -97,18 +97,35 @@ FrameBuffer::FrameBuffer(uint width, uint height, FrameBufferFlags flags): flags
void FrameBuffer::init()
{
mem_usage_ = 0;
// generate texture
glGenTextures(1, &textureid_);
glBindTexture(GL_TEXTURE_2D, textureid_);
// create texture with Mipmapping with multiple levels
if (flags_ & FrameBuffer_mipmap) {
glTexStorage2D(GL_TEXTURE_2D, MIPMAP_LEVEL + 1, (flags_ & FrameBuffer_alpha) ? GL_RGBA8 : GL_RGB8, attrib_.viewport.x, attrib_.viewport.y);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
// calculate GPU memory usage
int width = attrib_.viewport.x;
int height = attrib_.viewport.y;
for(int i=0; i < MIPMAP_LEVEL; ++i) {
mem_usage_ += ( width * height * (flags_ & FrameBuffer_alpha?4:3) ) / 1024;
width = MAX(1, (width / 2));
height = MAX(1, (height / 2));
}
}
// default : create simple texture for RGB(A)
else {
glTexStorage2D(GL_TEXTURE_2D, 1, (flags_ & FrameBuffer_alpha) ? GL_RGBA8 : GL_RGB8, attrib_.viewport.x, attrib_.viewport.y);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
// calculate GPU memory usage
mem_usage_ += ( attrib_.viewport.x * attrib_.viewport.y * (flags_ & FrameBuffer_alpha?4:3) ) / 1024;
}
// common texture parameters
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
@@ -120,7 +137,7 @@ void FrameBuffer::init()
glBindFramebuffer(GL_FRAMEBUFFER, framebufferid_);
#ifdef FRAMEBUFFER_DEBUG
g_printerr("New FBO %d (%d x %d)\n", framebufferid_, attrib_.viewport.x, attrib_.viewport.y);
g_printerr("Framebuffer %d created (%d x %d) - ", framebufferid_, attrib_.viewport.x, attrib_.viewport.y);
#endif
// take settings into account: no multisampling if application multisampling is level 0
@@ -147,8 +164,11 @@ void FrameBuffer::init()
glGenFramebuffers(1, &multisampling_framebufferid_);
glBindFramebuffer(GL_FRAMEBUFFER, multisampling_framebufferid_);
// calculate GPU memory usage
mem_usage_ += ( Settings::application.render.multisampling * attrib_.viewport.x * attrib_.viewport.y * (flags_ & FrameBuffer_alpha?4:3) ) / 1024;
#ifdef FRAMEBUFFER_DEBUG
g_printerr(" - with Multi Sampling (%d) \n", Settings::application.render.multisampling);
g_printerr("multi sampling (%d) - ", Settings::application.render.multisampling);
#endif
}
@@ -156,28 +176,34 @@ void FrameBuffer::init()
// (i.e. the multisampling_framebufferid_ FBO if enabled, default framebufferid_ otherwise)
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, textureid_, 0);
// attach multiple FBOs to the mipmaped texture
if (flags_ & FrameBuffer_mipmap) {
glGenFramebuffers(MIPMAP_LEVEL, mipmap_framebufferid_);
for(int i=0; i < MIPMAP_LEVEL; ++i) {
glBindFramebuffer(GL_FRAMEBUFFER, mipmap_framebufferid_[i]);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, textureid_, i + 1);
}
#ifdef FRAMEBUFFER_DEBUG
g_printerr(" - with Mipmap (%d)\n", MIPMAP_LEVEL);
g_printerr("mipmap (%d) - ", MIPMAP_LEVEL);
#endif
}
checkFramebufferStatus();
glBindFramebuffer(GL_FRAMEBUFFER, 0);
#ifdef FRAMEBUFFER_DEBUG
g_printerr("~%d kB allocated\n", mem_usage_);
#endif
}
FrameBuffer::~FrameBuffer()
{
#ifdef FRAMEBUFFER_DEBUG
g_printerr("Framebuffer %d deleted - ~%d kB freed\n", framebufferid_, mem_usage_);
#endif
if (framebufferid_)
glDeleteFramebuffers(1, &framebufferid_);
if (multisampling_framebufferid_)
@@ -188,14 +214,8 @@ FrameBuffer::~FrameBuffer()
glDeleteTextures(1, &textureid_);
if (multisampling_textureid_)
glDeleteTextures(1, &multisampling_textureid_);
#ifdef FRAMEBUFFER_DEBUG
GLint framebufferMemoryInKB = ( width() * height() * (flags_ & FrameBuffer_alpha?4:3) ) / 1024;
g_printerr("Framebuffer deleted %d x %d, ~%d kB freed\n", width(), height(), framebufferMemoryInKB);
#endif
}
uint FrameBuffer::texture() const
{
if (framebufferid_ == 0)
@@ -255,6 +275,7 @@ void FrameBuffer::resize(int width, int height)
// change resolution
attrib_.viewport = glm::ivec2(width, height);
mem_usage_ = 0;
}
}
}
@@ -360,8 +381,6 @@ bool FrameBuffer::blit(FrameBuffer *destination)
0, 0, destination->width(), destination->height(), GL_COLOR_BUFFER_BIT, GL_NEAREST);
glBindFramebuffer(GL_FRAMEBUFFER, 0);
// TODO : verify blit onto FBO with mipmapping ?
return true;
}
@@ -404,30 +423,18 @@ void FrameBuffer::checkFramebufferStatus()
case GL_FRAMEBUFFER_COMPLETE:
{
// approximation of RAM needed for this FBO
GLint framebufferMemoryInKB = ( width() * height() * (flags_ & FrameBuffer_alpha?4:3) * (flags_ & FrameBuffer_multisampling?2:1) ) / 1024;
// test available memory if created buffer is big (more than 8MB)
if ( framebufferMemoryInKB > 8000 ) {
if ( mem_usage_ > 8000 ) {
// Obtain RAM usage in GPU (if possible)
glm::ivec2 RAM = Rendering::getGPUMemoryInformation();
// bad case: not enough RAM, we should warn the user
if ( RAM.x < framebufferMemoryInKB * 3 ) {
if ( RAM.x < mem_usage_ * 3 ) {
Log::Warning("Critical allocation of frame buffer: only %d kB RAM remaining in graphics card.", RAM.x );
if (RAM.y < INT_MAX)
Log::Warning("Only %.1f %% of %d kB available.", 100.f*float(RAM.x)/float(RAM.y), RAM.y);
}
#ifdef FRAMEBUFFER_DEBUG
else {
// normal case: enough RAM (or unknown) for this FBO
g_printerr("Framebuffer allocated %d x %d, ~%d kB", width(), height(), framebufferMemoryInKB);
if (RAM.x < INT_MAX)
g_printerr(" (%d kB remaining)", RAM.x);
g_printerr("\n");
}
#endif
}
}