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Original implementation of Blur Image Filters

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With Gaussian, fast Gaussian, Hashed and morphological (opening and closing) methods. Remembering shader code for other fast methods.
This commit is contained in:
Bruno Herbelin
2022-05-31 00:34:37 +02:00
parent 662d8bcfda
commit e3bb95b3dd
27 changed files with 628 additions and 155 deletions
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63
FrameBuffer.cpp
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@@ -81,8 +81,6 @@ FrameBuffer::FrameBuffer(glm::vec3 resolution, FrameBufferFlags flags): flags_(f
attrib_.viewport = glm::ivec2(resolution);
setProjectionArea(glm::vec2(1.f, 1.f));
attrib_.clear_color = glm::vec4(0.f, 0.f, 0.f, 0.f);
for(int i=0; i<MIPMAP_LEVEL; ++i)
mipmap_framebufferid_[i] = 0;
}
FrameBuffer::FrameBuffer(uint width, uint height, FrameBufferFlags flags): flags_(flags),
@@ -91,8 +89,6 @@ FrameBuffer::FrameBuffer(uint width, uint height, FrameBufferFlags flags): flags
attrib_.viewport = glm::ivec2(width, height);
setProjectionArea(glm::vec2(1.f, 1.f));
attrib_.clear_color = glm::vec4(0.f, 0.f, 0.f, 0.f);
for(int i=0; i<MIPMAP_LEVEL; ++i)
mipmap_framebufferid_[i] = 0;
}
void FrameBuffer::init()
@@ -107,24 +103,16 @@ void FrameBuffer::init()
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;
}
// calculate GPU memory usage (for debug only)
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);
@@ -179,12 +167,14 @@ void FrameBuffer::init()
// 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);
// calculate GPU memory usage
int width = attrib_.viewport.x;
int height = attrib_.viewport.y;
for(int i=1; i < MIPMAP_LEVEL; ++i) {
width = MAX(1, (width / 2));
height = MAX(1, (height / 2));
mem_usage_ += ( width * height * (flags_ & FrameBuffer_alpha?4:3) ) / 1024;
}
#ifdef FRAMEBUFFER_DEBUG
g_printerr("mipmap (%d) - ", MIPMAP_LEVEL);
#endif
@@ -208,8 +198,6 @@ FrameBuffer::~FrameBuffer()
glDeleteFramebuffers(1, &framebufferid_);
if (multisampling_framebufferid_)
glDeleteFramebuffers(1, &multisampling_framebufferid_);
if (mipmap_framebufferid_[0])
glDeleteFramebuffers(MIPMAP_LEVEL, mipmap_framebufferid_);
if (textureid_)
glDeleteTextures(1, &textureid_);
if (multisampling_textureid_)
@@ -260,11 +248,6 @@ void FrameBuffer::resize(int width, int height)
glDeleteFramebuffers(1, &multisampling_framebufferid_);
multisampling_framebufferid_ = 0;
if (mipmap_framebufferid_[0])
glDeleteFramebuffers(MIPMAP_LEVEL, mipmap_framebufferid_);
for(int i=0; i<MIPMAP_LEVEL; ++i)
mipmap_framebufferid_[i] = 0;
if (textureid_)
glDeleteTextures(1, &textureid_);
textureid_ = 0;
@@ -305,28 +288,14 @@ void FrameBuffer::end()
0, 0, attrib_.viewport.x, attrib_.viewport.y, GL_COLOR_BUFFER_BIT, GL_NEAREST);
}
// if mipmapped texture, fill FBOs
if (flags_ & FrameBuffer_mipmap) {
// First read full-size framebuffer
glBindFramebuffer(GL_READ_FRAMEBUFFER, framebufferid_);
int width = attrib_.viewport.x;
int height = attrib_.viewport.y;
// iterate over all levels of mipmaps
for(int i=0; i < MIPMAP_LEVEL; ++i) {
// draw on Mipmap level i
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, mipmap_framebufferid_[i]);
// blit into half-sized mipmap i (with linear nearest color)
glBlitFramebuffer(0, 0, width, height,
0, 0, width / 2, height / 2, GL_COLOR_BUFFER_BIT, GL_NEAREST);
// next iteration (i+1), read half-size mipmap level i
glBindFramebuffer(GL_READ_FRAMEBUFFER, mipmap_framebufferid_[i]);
width = MAX(1, (width / 2));
height = MAX(1, (height / 2));
}
}
FrameBuffer::release();
if (flags_ & FrameBuffer_mipmap) {
glBindTexture(GL_TEXTURE_2D, textureid_);
glGenerateMipmap(GL_TEXTURE_2D);
glBindTexture(GL_TEXTURE_2D, 0);
}
Rendering::manager().popAttrib();
}