From 8f459cf958f1aee7b72d7dce3eed999061cd7a77 Mon Sep 17 00:00:00 2001
From: yellows8 <yellows8@users.noreply.github.com>
Date: Mon, 20 Nov 2017 19:15:54 -0500
Subject: [PATCH] Use u32 for gfxGetFramebuffer() width/height. Added
 gfxGetFramebufferDisplayOffset().

---
 nx/include/switch/gfx/gfx.h |  4 +++-
 nx/source/gfx/gfx.c         | 19 ++++++++++++++++++-
 2 files changed, 21 insertions(+), 2 deletions(-)

diff --git a/nx/include/switch/gfx/gfx.h b/nx/include/switch/gfx/gfx.h
index a715edea..ba9ee17f 100644
--- a/nx/include/switch/gfx/gfx.h
+++ b/nx/include/switch/gfx/gfx.h
@@ -4,5 +4,7 @@ void gfxExit(void);
 
 void gfxWaitForVsync();
 void gfxSwapBuffers();
-u8* gfxGetFramebuffer(u16* width, u16* height);
+u8* gfxGetFramebuffer(u32* width, u32* height);
 void gfxFlushBuffers(void);
+
+u32 gfxGetFramebufferDisplayOffset(u32 x, u32 y);
diff --git a/nx/source/gfx/gfx.c b/nx/source/gfx/gfx.c
index 51fe735f..d2db8c03 100644
--- a/nx/source/gfx/gfx.c
+++ b/nx/source/gfx/gfx.c
@@ -231,7 +231,7 @@ void gfxSwapBuffers() {
     if (R_FAILED(rc)) fatalSimple(rc);
 }
 
-u8* gfxGetFramebuffer(u16* width, u16* height) {
+u8* gfxGetFramebuffer(u32* width, u32* height) {
     if(width) *width = 1280;
     if(height) *height = 720;
 
@@ -242,3 +242,20 @@ void gfxFlushBuffers(void) {
     armDCacheFlush(&g_gfxFramebuf[g_gfxCurrentBuffer*g_nvgfx_singleframebuf_size], g_nvgfx_singleframebuf_size);
 }
 
+//This implements tegra blocklinear, with hard-coded constants etc.
+u32 gfxGetFramebufferDisplayOffset(u32 x, u32 y) {
+    u32 width=0, height=0;
+    u32 tilepos, tmp_pos;
+
+    gfxGetFramebuffer(&width, &height);
+
+    y = height-1-y;
+
+    tilepos = ((y & 127) / 16) + (x/16*8) + ((y/16/8)*(width/16*8));
+    tilepos = tilepos*16*16 * 4;
+
+    tmp_pos = ((y%16)/8)*512 + ((x%16)/8)*256 + ((y%8)/2)*64 + ((x%8)/4)*32 + (y%2)*16 + (x%4)*4;//This line is a modified version of code from the Tegra X1 datasheet.
+
+    return tilepos + tmp_pos;
+}
+