Reapply "Fix screen and portal capture not working on some intel gpus"

This reverts commit 7f00ce22e7e86904e09f900422dfa591d045f447.

1 files changed, 9 insertions, 5 deletions

diff --git a/src/image_writer.c b/src/image_writer.c
index e153a34..3d731a0 100644
--- a/src/image_writer.c
+++ b/src/image_writer.c
@@ -71,11 +71,15 @@ static bool gsr_image_writer_write_opengl_texture_to_file(gsr_image_writer *self
         return false;
     }
 
-    // TODO: hdr support
-    self->egl->glBindTexture(GL_TEXTURE_2D, self->texture);
-    // We could use glGetTexSubImage, but it's only available starting from opengl 4.5
-    self->egl->glGetTexImage(GL_TEXTURE_2D, 0, GL_RGBA, GL_UNSIGNED_BYTE, frame_data);
-    self->egl->glBindTexture(GL_TEXTURE_2D, 0);
+    unsigned int fbo = 0;
+    self->egl->glGenFramebuffers(1, &fbo);
+    self->egl->glBindFramebuffer(GL_FRAMEBUFFER, fbo);
+    self->egl->glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, self->texture, 0);
+
+    self->egl->glReadPixels(0, 0, self->width, self->height, GL_RGBA, GL_UNSIGNED_BYTE, frame_data);
+
+    self->egl->glBindFramebuffer(GL_FRAMEBUFFER, 0);
+    self->egl->glDeleteFramebuffers(1, &fbo);
 
     self->egl->glFlush();
     self->egl->glFinish();