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c9f54ca371
The API docs outline why quite well. This should make it possible to do saving of textures to image files without any private API with the same featureset that GTK uses. Also remove the gsktextureprivate.h include where gdk_texture_get_format() was the only reason for it.
465 lines
13 KiB
C
465 lines
13 KiB
C
/* gdkgltexture.c
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*
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* Copyright 2016 Benjamin Otte
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "config.h"
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#include "gdkgltextureprivate.h"
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#include "gdkdisplayprivate.h"
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#include "gdkglcontextprivate.h"
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#include "gdkmemoryformatprivate.h"
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#include "gdkmemorytextureprivate.h"
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#include <epoxy/gl.h>
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/**
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* GdkGLTexture:
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*
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* A GdkTexture representing a GL texture object.
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*/
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struct _GdkGLTexture {
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GdkTexture parent_instance;
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GdkGLContext *context;
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guint id;
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GdkTexture *saved;
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GDestroyNotify destroy;
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gpointer data;
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};
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struct _GdkGLTextureClass {
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GdkTextureClass parent_class;
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};
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G_DEFINE_TYPE (GdkGLTexture, gdk_gl_texture, GDK_TYPE_TEXTURE)
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static void
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drop_gl_resources (GdkGLTexture *self)
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{
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if (self->destroy)
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{
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self->destroy (self->data);
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self->destroy = NULL;
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self->data = NULL;
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}
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g_clear_object (&self->context);
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self->id = 0;
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}
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static void
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gdk_gl_texture_dispose (GObject *object)
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{
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GdkGLTexture *self = GDK_GL_TEXTURE (object);
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drop_gl_resources (self);
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g_clear_object (&self->saved);
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G_OBJECT_CLASS (gdk_gl_texture_parent_class)->dispose (object);
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}
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typedef void (* GLFunc) (GdkGLTexture *self,
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GdkGLContext *context,
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gpointer data);
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typedef struct _InvokeData
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{
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GdkGLTexture *self;
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volatile int spinlock;
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GLFunc func;
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gpointer data;
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} InvokeData;
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static gboolean
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gdk_gl_texture_invoke_callback (gpointer data)
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{
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InvokeData *invoke = data;
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GdkGLContext *context;
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context = gdk_display_get_gl_context (gdk_gl_context_get_display (invoke->self->context));
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gdk_gl_context_make_current (context);
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glBindTexture (GL_TEXTURE_2D, invoke->self->id);
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invoke->func (invoke->self, context, invoke->data);
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g_atomic_int_set (&invoke->spinlock, 1);
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return FALSE;
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}
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static void
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gdk_gl_texture_run (GdkGLTexture *self,
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GLFunc func,
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gpointer data)
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{
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InvokeData invoke = { self, 0, func, data };
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g_main_context_invoke (NULL, gdk_gl_texture_invoke_callback, &invoke);
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while (g_atomic_int_get (&invoke.spinlock) == 0);
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}
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typedef struct _Download Download;
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struct _Download
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{
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GdkMemoryFormat format;
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guchar *data;
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gsize stride;
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};
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static gboolean
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gdk_gl_texture_find_format (gboolean use_es,
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GLint gl_format,
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GLint gl_type,
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GdkMemoryFormat *out_format)
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{
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GdkMemoryFormat format;
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for (format = 0; format < GDK_MEMORY_N_FORMATS; format++)
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{
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GLenum q_internal_format, q_format, q_type;
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if (!gdk_memory_format_gl_format (format, use_es, &q_internal_format, &q_format, &q_type))
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continue;
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if (q_format != gl_format || q_type != gl_type)
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continue;
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*out_format = format;
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return TRUE;
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}
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return FALSE;
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}
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static inline void
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gdk_gl_texture_do_download (GdkGLTexture *self,
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GdkGLContext *context,
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gpointer download_)
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{
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GdkTexture *texture = GDK_TEXTURE (self);
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gsize expected_stride;
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Download *download = download_;
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GLenum gl_internal_format, gl_format, gl_type;
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expected_stride = texture->width * gdk_memory_format_bytes_per_pixel (download->format);
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if (download->stride == expected_stride &&
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!gdk_gl_context_get_use_es (context) &&
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gdk_memory_format_gl_format (download->format, TRUE, &gl_internal_format, &gl_format, &gl_type))
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{
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glGetTexImage (GL_TEXTURE_2D,
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0,
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gl_format,
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gl_type,
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download->data);
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}
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else
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{
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GdkMemoryFormat actual_format;
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GLint gl_read_format, gl_read_type;
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GLuint fbo;
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glGenFramebuffers (1, &fbo);
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glBindFramebuffer (GL_FRAMEBUFFER, fbo);
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glFramebufferTexture2D (GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, self->id, 0);
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if (gdk_gl_context_check_version (context, 4, 3, 3, 1))
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{
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glGetFramebufferParameteriv (GL_FRAMEBUFFER, GL_IMPLEMENTATION_COLOR_READ_FORMAT, &gl_read_format);
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glGetFramebufferParameteriv (GL_FRAMEBUFFER, GL_IMPLEMENTATION_COLOR_READ_TYPE, &gl_read_type);
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if (!gdk_gl_texture_find_format (gdk_gl_context_get_use_es (context), gl_read_format, gl_read_type, &actual_format))
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actual_format = GDK_MEMORY_R8G8B8A8_PREMULTIPLIED; /* pray */
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}
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else
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{
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gl_read_format = GL_RGBA;
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gl_read_type = GL_UNSIGNED_BYTE;
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actual_format = GDK_MEMORY_R8G8B8A8_PREMULTIPLIED;
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}
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if (download->format == actual_format &&
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(download->stride == expected_stride))
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{
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glReadPixels (0, 0,
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texture->width, texture->height,
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gl_read_format,
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gl_read_type,
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download->data);
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}
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else
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{
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gsize actual_bpp = gdk_memory_format_bytes_per_pixel (actual_format);
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guchar *pixels = g_malloc_n (texture->width * actual_bpp, texture->height);
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glReadPixels (0, 0,
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texture->width, texture->height,
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gl_read_format,
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gl_read_type,
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pixels);
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gdk_memory_convert (download->data,
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download->stride,
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download->format,
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pixels,
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texture->width * actual_bpp,
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actual_format,
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texture->width,
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texture->height);
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g_free (pixels);
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}
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glBindFramebuffer (GL_FRAMEBUFFER, 0);
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glDeleteFramebuffers (1, &fbo);
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}
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}
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static void
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gdk_gl_texture_download (GdkTexture *texture,
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GdkMemoryFormat format,
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guchar *data,
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gsize stride)
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{
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GdkGLTexture *self = GDK_GL_TEXTURE (texture);
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Download download;
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if (self->saved)
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{
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gdk_texture_do_download (self->saved, format, data, stride);
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return;
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}
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download.format = format;
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download.data = data;
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download.stride = stride;
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gdk_gl_texture_run (self, gdk_gl_texture_do_download, &download);
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}
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static void
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gdk_gl_texture_class_init (GdkGLTextureClass *klass)
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{
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GdkTextureClass *texture_class = GDK_TEXTURE_CLASS (klass);
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GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
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texture_class->download = gdk_gl_texture_download;
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gobject_class->dispose = gdk_gl_texture_dispose;
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}
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static void
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gdk_gl_texture_init (GdkGLTexture *self)
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{
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}
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GdkGLContext *
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gdk_gl_texture_get_context (GdkGLTexture *self)
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{
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return self->context;
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}
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guint
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gdk_gl_texture_get_id (GdkGLTexture *self)
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{
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return self->id;
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}
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/**
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* gdk_gl_texture_release:
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* @self: a `GdkTexture` wrapping a GL texture
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*
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* Releases the GL resources held by a `GdkGLTexture`.
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*
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* The texture contents are still available via the
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* [method@Gdk.Texture.download] function, after this
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* function has been called.
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*/
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void
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gdk_gl_texture_release (GdkGLTexture *self)
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{
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GdkTexture *texture;
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g_return_if_fail (GDK_IS_GL_TEXTURE (self));
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g_return_if_fail (self->saved == NULL);
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texture = GDK_TEXTURE (self);
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self->saved = GDK_TEXTURE (gdk_memory_texture_from_texture (texture,
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gdk_texture_get_format (texture)));
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drop_gl_resources (self);
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}
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static void
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gdk_gl_texture_determine_format (GdkGLTexture *self)
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{
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GdkTexture *texture = GDK_TEXTURE (self);
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GLint active_texture;
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GLint internal_format;
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/* Abort if somebody else is GL-ing here... */
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if (self->context != gdk_gl_context_get_current () ||
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/* ... or glGetTexLevelParameter() isn't supported */
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!gdk_gl_context_check_version (self->context, 0, 0, 3, 1))
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{
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texture->format = GDK_MEMORY_DEFAULT;
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return;
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}
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/* We need to be careful about modifying the GL context, as this is not
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* expected during construction */
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glGetIntegerv (GL_TEXTURE_BINDING_2D, &active_texture);
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glBindTexture (GL_TEXTURE_2D, self->id);
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glGetTexLevelParameteriv (GL_TEXTURE_2D, 0, GL_TEXTURE_INTERNAL_FORMAT, &internal_format);
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switch (internal_format)
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{
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case GL_RGB8:
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texture->format = GDK_MEMORY_R8G8B8;
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break;
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case GL_RGBA8:
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texture->format = GDK_MEMORY_R8G8B8A8_PREMULTIPLIED;
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break;
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case GL_RGB16:
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texture->format = GDK_MEMORY_R16G16B16;
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break;
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case GL_RGBA16:
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texture->format = GDK_MEMORY_R16G16B16A16_PREMULTIPLIED;
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break;
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case GL_RGB16F:
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texture->format = GDK_MEMORY_R16G16B16_FLOAT;
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break;
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case GL_RGBA16F:
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texture->format = GDK_MEMORY_R16G16B16A16_FLOAT_PREMULTIPLIED;
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break;
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case GL_RGB32F:
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texture->format = GDK_MEMORY_R32G32B32_FLOAT;
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break;
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case GL_RGBA32F:
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texture->format = GDK_MEMORY_R32G32B32A32_FLOAT_PREMULTIPLIED;
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break;
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case GL_RGBA:
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{
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GLint red_size = 0;
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GLint green_size = 0;
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GLint blue_size = 0;
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GLint alpha_size = 0;
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GLint red_type = 0;
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GLint green_type = 0;
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GLint blue_type = 0;
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GLint alpha_type = 0;
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glGetTexLevelParameteriv (GL_TEXTURE_2D, 0, GL_TEXTURE_RED_TYPE, &red_type);
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glGetTexLevelParameteriv (GL_TEXTURE_2D, 0, GL_TEXTURE_GREEN_TYPE, &green_type);
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glGetTexLevelParameteriv (GL_TEXTURE_2D, 0, GL_TEXTURE_BLUE_TYPE, &blue_type);
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glGetTexLevelParameteriv (GL_TEXTURE_2D, 0, GL_TEXTURE_ALPHA_TYPE, &alpha_type);
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glGetTexLevelParameteriv (GL_TEXTURE_2D, 0, GL_TEXTURE_RED_SIZE, &red_size);
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glGetTexLevelParameteriv (GL_TEXTURE_2D, 0, GL_TEXTURE_GREEN_SIZE, &green_size);
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glGetTexLevelParameteriv (GL_TEXTURE_2D, 0, GL_TEXTURE_BLUE_SIZE, &blue_size);
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glGetTexLevelParameteriv (GL_TEXTURE_2D, 0, GL_TEXTURE_ALPHA_SIZE, &alpha_size);
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#define CHECK_RGBA(rt,gt,bt,at,rs,gs,bs,as) \
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(red_type == rt && green_type == gt && blue_type == bt && alpha_type == at && \
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red_size == rs && green_size == gs && blue_size == bs && alpha_size == as)
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if (CHECK_RGBA (GL_UNSIGNED_NORMALIZED, GL_UNSIGNED_NORMALIZED, GL_UNSIGNED_NORMALIZED, GL_UNSIGNED_NORMALIZED, 8, 8, 8, 8))
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{
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texture->format = GDK_MEMORY_R8G8B8A8_PREMULTIPLIED;
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break;
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}
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#undef CHECK_RGBA
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}
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G_GNUC_FALLTHROUGH;
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default:
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g_warning ("Texture in unexpected format 0x%X (%d). File a bug about adding it to GTK", internal_format, internal_format);
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/* fallback to the dumbest possible format
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* so that even age old GLES can do it */
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texture->format = GDK_MEMORY_R8G8B8A8_PREMULTIPLIED;
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break;
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}
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glBindTexture (GL_TEXTURE_2D, active_texture);
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}
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/**
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* gdk_gl_texture_new:
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* @context: a `GdkGLContext`
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* @id: the ID of a texture that was created with @context
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* @width: the nominal width of the texture
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* @height: the nominal height of the texture
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* @destroy: a destroy notify that will be called when the GL resources
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* are released
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* @data: data that gets passed to @destroy
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*
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* Creates a new texture for an existing GL texture.
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*
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* Note that the GL texture must not be modified until @destroy is called,
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* which will happen when the GdkTexture object is finalized, or due to
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* an explicit call of [method@Gdk.GLTexture.release].
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*
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* Return value: (transfer full) (type GdkGLTexture): A newly-created
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* `GdkTexture`
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*/
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GdkTexture *
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gdk_gl_texture_new (GdkGLContext *context,
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guint id,
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int width,
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int height,
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GDestroyNotify destroy,
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gpointer data)
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{
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GdkGLTexture *self;
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g_return_val_if_fail (GDK_IS_GL_CONTEXT (context), NULL);
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g_return_val_if_fail (id != 0, NULL);
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g_return_val_if_fail (width > 0, NULL);
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g_return_val_if_fail (height > 0, NULL);
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self = g_object_new (GDK_TYPE_GL_TEXTURE,
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"width", width,
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"height", height,
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NULL);
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self->context = g_object_ref (context);
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self->id = id;
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self->destroy = destroy;
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self->data = data;
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gdk_gl_texture_determine_format (self);
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return GDK_TEXTURE (self);
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}
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