From 63aeb9cafae4102fd62a0d88e6723be2eafe8a7f Mon Sep 17 00:00:00 2001
From: Jari Vetoniemi <mailroxas@gmail.com>
Date: Thu, 26 Jan 2017 09:04:49 +0200
Subject: glFlush after glRadPixels

Tell driver we want this data soonish(tm)
---
 glcapture.c | 1 +
 glwrangle.h | 3 +++
 2 files changed, 4 insertions(+)

diff --git a/glcapture.c b/glcapture.c
index c9dcd91..37a0e81 100644
--- a/glcapture.c
+++ b/glcapture.c
@@ -400,6 +400,7 @@ capture_frame_pbo(struct gl *gl, const GLint view[4], const uint64_t ts)
    }
 
    glReadPixels(view[0], view[1], view[2], view[3], frame.format, GL_UNSIGNED_BYTE, NULL);
+   glFlush();
 
    for (size_t i = 0; i < ARRAY_SIZE(map); ++i)
       glPixelStorei(map[i].t, map[i].o);
diff --git a/glwrangle.h b/glwrangle.h
index d423f47..428d911 100644
--- a/glwrangle.h
+++ b/glwrangle.h
@@ -1,5 +1,6 @@
 #pragma once
 
+static void (*_glFlush)(void);
 static GLenum (*_glGetError)(void);
 static void (*_glGetIntegerv)(GLenum, GLint*);
 static void (*_glGetFloatv)(GLenum, GLfloat*);
@@ -33,6 +34,7 @@ struct gl_version {
 static enum gl_variant OPENGL_VARIANT;
 static struct gl_version OPENGL_VERSION;
 
+#define glFlush _glFlush
 #define glGetError _glGetError
 #define glGetIntegerv _glGetIntegerv
 #define glGetFloatv _glGetFloatv
@@ -99,6 +101,7 @@ load_gl_function_pointers(void* (*procs[])(const char*), const size_t memb)
 
 #define GL_REQUIRED(x) do { if (!(_##x = proc(#x))) { ERRX(EXIT_FAILURE, "Failed to load %s", #x); } } while (0)
 #define GL_OPTIONAL(x) do { _##x = proc(#x); } while (0)
+   GL_REQUIRED(glFlush);
    GL_REQUIRED(glGetError);
    GL_REQUIRED(glGetIntegerv);
    GL_REQUIRED(glGetFloatv);
-- 
cgit v1.2.3-70-g09d2