# HG changeset patch
# User John Tsiombikas <nuclear@member.fsf.org>
# Date 1411547647 -10800
# Node ID d06e4e24f922fb37561a3ad5704f7e940b902e66
# Parent  ccbd444939a113b73b01e2c466861080c5c07141
foo

diff -r ccbd444939a1 -r d06e4e24f922 src/game.cc
--- a/src/game.cc	Mon Sep 22 18:36:24 2014 +0300
+++ b/src/game.cc	Wed Sep 24 11:34:07 2014 +0300
@@ -1,8 +1,19 @@
 #include <stdio.h>
+#include <assert.h>
+#include <algorithm>
 #include "opengl.h"
 #include "game.h"
 #include "goatvr.h"
 
+static void create_rtarg(int x, int y);
+static int next_pow2(int x);
+
+static int win_width, win_height;
+static unsigned int fb_tex;
+static unsigned int fbo, fb_depth;
+static int fb_xsz, fb_ysz;
+static int fb_tex_xsz, fb_tex_ysz;
+
 bool game_init()
 {
 	init_opengl();
@@ -13,6 +24,12 @@
 
 	glEnable(GL_DEPTH_TEST);
 	glEnable(GL_CULL_FACE);
+
+	int sdk_fb_xsz = vr_getf(VR_LEYE_XRES) + vr_getf(VR_REYE_XRES);
+	int sdk_fb_ysz = std::max(vr_getf(VR_LEYE_YRES), vr_getf(VR_REYE_YRES));
+	create_rtarg(sdk_fb_xsz, sdk_fb_ysz);
+
+	return true;
 }
 
 void game_cleanup()
@@ -20,10 +37,65 @@
 	vr_shutdown();
 }
 
-void game_update(long tm);
-void game_display();
-void game_reshape(int x, int y);
+void game_update(long tm)
+{
+}
+
+void game_display()
+{
+}
+
+void game_reshape(int x, int y)
+{
+}
+
 void game_keyboard(int key, bool pressed);
 void game_mouse_button(int bn, bool state, int x, int y);
 void game_mouse_motion(int x, int y);
 
+
+static void create_rtarg(int x, int y)
+{
+	if(x == fb_xsz && y == fb_ysz) {
+		return;	// nothing changed
+	}
+
+	fb_xsz = x;
+	fb_ysz = y;
+	fb_tex_xsz = next_pow2(fb_xsz);
+	fb_tex_ysz = next_pow2(fb_ysz);
+
+	if(!fbo) {
+		glGenFramebuffers(1, &fbo);
+
+		glGenTextures(1, &fb_tex);
+		glBindTexture(GL_TEXTURE_2D, fb_tex);
+		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+
+		glGenRenderbuffers(1, &fb_depth);
+	}
+
+	glBindFramebuffer(GL_FRAMEBUFFER, fbo);
+
+	glBindTexture(GL_TEXTURE_2D, fb_tex);
+	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, fb_tex_xsz, fb_tex_ysz, 0, GL_RGB, GL_UNSIGNED_BYTE, 0);
+	glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, fb_tex, 0);
+
+	glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT, fb_tex_xsz, fb_tex_ysz);
+	glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, fb_depth);
+
+	assert(glCheckFramebufferStatus(GL_FRAMEBUFFER) == GL_FRAMEBUFFER_COMPLETE);
+	glBindFramebuffer(GL_FRAMEBUFFER, 0);
+}
+
+static int next_pow2(int x)
+{
+	x -= 1;
+	x |= x >> 1;
+	x |= x >> 2;
+	x |= x >> 4;
+	x |= x >> 8;
+	x |= x >> 16;
+	return x + 1;
+}