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ENABLE_THUMBNAIL_GENERATOR -> Generate thumbnails using GLEW_EXT_framebuffer_object on graphic cards supporting it

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This commit is contained in:
Enrico Turri 2019-11-05 14:50:58 +01:00
parent d8dca69d60
commit 41dadfdfcf
4 changed files with 129 additions and 11 deletions
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114
src/slic3r/GUI/GLCanvas3D.cpp
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@ -1653,10 +1653,12 @@ void GLCanvas3D::render()
#if ENABLE_THUMBNAIL_GENERATOR
void GLCanvas3D::render_thumbnail(ThumbnailData& thumbnail_data, unsigned int w, unsigned int h, bool printable_only, bool parts_only, bool transparent_background)
{
if (GLCanvas3DManager::are_framebuffers_supported())
_render_thumbnail_framebuffer(thumbnail_data, w, h, printable_only, parts_only, transparent_background);
else
_render_thumbnail_legacy(thumbnail_data, w, h, printable_only, parts_only, transparent_background);
switch (GLCanvas3DManager::get_framebuffers_type())
{
case GLCanvas3DManager::FB_Arb: { _render_thumbnail_framebuffer(thumbnail_data, w, h, printable_only, parts_only, transparent_background); break; }
case GLCanvas3DManager::FB_Ext: { _render_thumbnail_framebuffer_ext(thumbnail_data, w, h, printable_only, parts_only, transparent_background); break; }
default: { _render_thumbnail_legacy(thumbnail_data, w, h, printable_only, parts_only, transparent_background); break; }
}
}
#endif // ENABLE_THUMBNAIL_GENERATOR
@ -3772,6 +3774,110 @@ void GLCanvas3D::_render_thumbnail_framebuffer(ThumbnailData& thumbnail_data, un
glsafe(::glDisable(GL_MULTISAMPLE));
}
void GLCanvas3D::_render_thumbnail_framebuffer_ext(ThumbnailData& thumbnail_data, unsigned int w, unsigned int h, bool printable_only, bool parts_only, bool transparent_background)
{
thumbnail_data.set(w, h);
if (!thumbnail_data.is_valid())
return;
bool multisample = m_multisample_allowed;
if (multisample)
glsafe(::glEnable(GL_MULTISAMPLE));
GLint max_samples;
glsafe(::glGetIntegerv(GL_MAX_SAMPLES_EXT, &max_samples));
GLsizei num_samples = max_samples / 2;
GLuint render_fbo;
glsafe(::glGenFramebuffersEXT(1, &render_fbo));
glsafe(::glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, render_fbo));
GLuint render_tex = 0;
GLuint render_tex_buffer = 0;
if (multisample)
{
// use renderbuffer instead of texture to avoid the need to use glTexImage2DMultisample which is available only since OpenGL 3.2
glsafe(::glGenRenderbuffersEXT(1, &render_tex_buffer));
glsafe(::glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, render_tex_buffer));
glsafe(::glRenderbufferStorageMultisampleEXT(GL_RENDERBUFFER_EXT, num_samples, GL_RGBA8, w, h));
glsafe(::glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT, GL_RENDERBUFFER_EXT, render_tex_buffer));
}
else
{
glsafe(::glGenTextures(1, &render_tex));
glsafe(::glBindTexture(GL_TEXTURE_2D, render_tex));
glsafe(::glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, w, h, 0, GL_RGBA, GL_UNSIGNED_BYTE, nullptr));
glsafe(::glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR));
glsafe(::glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR));
glsafe(::glFramebufferTexture2D(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT, GL_TEXTURE_2D, render_tex, 0));
}
GLuint render_depth;
glsafe(::glGenRenderbuffersEXT(1, &render_depth));
glsafe(::glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, render_depth));
if (multisample)
glsafe(::glRenderbufferStorageMultisampleEXT(GL_RENDERBUFFER_EXT, num_samples, GL_DEPTH_COMPONENT24, w, h));
else
glsafe(::glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT, GL_DEPTH_COMPONENT, w, h));
glsafe(::glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT, GL_RENDERBUFFER_EXT, render_depth));
GLenum drawBufs[] = { GL_COLOR_ATTACHMENT0 };
glsafe(::glDrawBuffers(1, drawBufs));
if (::glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT) == GL_FRAMEBUFFER_COMPLETE_EXT)
{
render_volumes_in_thumbnail(m_shader, m_volumes.volumes, thumbnail_data, printable_only, parts_only, transparent_background);
if (multisample)
{
GLuint resolve_fbo;
glsafe(::glGenFramebuffersEXT(1, &resolve_fbo));
glsafe(::glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, resolve_fbo));
GLuint resolve_tex;
glsafe(::glGenTextures(1, &resolve_tex));
glsafe(::glBindTexture(GL_TEXTURE_2D, resolve_tex));
glsafe(::glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, w, h, 0, GL_RGBA, GL_UNSIGNED_BYTE, nullptr));
glsafe(::glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR));
glsafe(::glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR));
glsafe(::glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT, GL_TEXTURE_2D, resolve_tex, 0));
glsafe(::glDrawBuffers(1, drawBufs));
if (::glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT) == GL_FRAMEBUFFER_COMPLETE_EXT)
{
glsafe(::glBindFramebufferEXT(GL_READ_FRAMEBUFFER_EXT, render_fbo));
glsafe(::glBindFramebufferEXT(GL_DRAW_FRAMEBUFFER_EXT, resolve_fbo));
glsafe(::glBlitFramebufferEXT(0, 0, w, h, 0, 0, w, h, GL_COLOR_BUFFER_BIT, GL_LINEAR));
glsafe(::glBindFramebufferEXT(GL_READ_FRAMEBUFFER_EXT, resolve_fbo));
glsafe(::glReadPixels(0, 0, w, h, GL_RGBA, GL_UNSIGNED_BYTE, (void*)thumbnail_data.pixels.data()));
}
glsafe(::glDeleteTextures(1, &resolve_tex));
glsafe(::glDeleteFramebuffersEXT(1, &resolve_fbo));
}
else
glsafe(::glReadPixels(0, 0, w, h, GL_RGBA, GL_UNSIGNED_BYTE, (void*)thumbnail_data.pixels.data()));
#if ENABLE_THUMBNAIL_GENERATOR_DEBUG_OUTPUT
debug_output_thumbnail(thumbnail_data);
#endif // ENABLE_THUMBNAIL_GENERATOR_DEBUG_OUTPUT
}
glsafe(::glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0));
glsafe(::glDeleteRenderbuffersEXT(1, &render_depth));
if (render_tex_buffer != 0)
glsafe(::glDeleteRenderbuffersEXT(1, &render_tex_buffer));
if (render_tex != 0)
glsafe(::glDeleteTextures(1, &render_tex));
glsafe(::glDeleteFramebuffersEXT(1, &render_fbo));
if (multisample)
glsafe(::glDisable(GL_MULTISAMPLE));
}
void GLCanvas3D::_render_thumbnail_legacy(ThumbnailData& thumbnail_data, unsigned int w, unsigned int h, bool printable_only, bool parts_only, bool transparent_background)
{
// check that thumbnail size does not exceed the default framebuffer size