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gltexture: Fix download() for GLES

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GLES can't do glGetTexImage(), so implement a version that does
glReadPixels() on GLES.
This commit is contained in:
Benjamin Otte
2021-09-16 23:14:59 +02:00
parent b6d3561f4a
commit a4f3fbbda1
1 changed files with 35 additions and 6 deletions
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41
gdk/gdkgltexture.c
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@@ -108,6 +108,37 @@ gdk_gl_texture_run (GdkGLTexture *self,
while (g_atomic_int_get (&invoke.spinlock) == 0);
}
static inline void
gdk_gl_texture_get_tex_image (GdkGLTexture *self,
GLenum gl_format,
GLenum gl_type,
GLvoid *data)
{
if (gdk_gl_context_get_use_es (self->context))
{
GdkTexture *texture = GDK_TEXTURE (self);
GLuint fbo;
glGenFramebuffers (1, &fbo);
glBindFramebuffer (GL_FRAMEBUFFER, fbo);
glFramebufferTexture2D (GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, self->id, 0);
glReadPixels (0, 0,
texture->width, texture->height,
gl_format,
gl_type,
data);
glBindFramebuffer (GL_FRAMEBUFFER, 0);
glDeleteFramebuffers (1, &fbo);
}
else
{
glGetTexImage (GL_TEXTURE_2D,
0,
gl_format,
gl_type,
data);
}
}
static void
gdk_gl_texture_do_download_texture (gpointer texture_,
gpointer result_)
@@ -185,11 +216,10 @@ gdk_gl_texture_do_download_texture (gpointer texture_,
stride = gdk_memory_format_bytes_per_pixel (format) * texture->width;
data = g_malloc (stride * texture->height);
glGetTexImage (GL_TEXTURE_2D,
0,
gl_format,
gl_type,
data);
gdk_gl_texture_get_tex_image (texture_,
gl_format,
gl_type,
data);
bytes = g_bytes_new_take (data, stride * texture->height);
*result = gdk_memory_texture_new (texture->width,
@@ -230,7 +260,6 @@ gdk_gl_texture_do_download (gpointer texture,
#error "Unknown byte order for gdk_gl_texture_download()"
#endif
data);
}
static void