From dc052c19eef829038afde1ff14abd400b4d261a0 Mon Sep 17 00:00:00 2001
From: plutoo <plutoo@univor.se>
Date: Mon, 25 Aug 2014 23:11:53 +0200
Subject: [PATCH] gsp: Added gspAllocLinear() to allocate from LINEAR heap

Required by CSND, for example
---
 libctru/include/3ds/CSND.h | 13 +++++++++++++
 libctru/include/3ds/gfx.h  |  1 +
 libctru/source/gfx.c       | 33 +++++++++++++++++++++++++--------
 3 files changed, 39 insertions(+), 8 deletions(-)

diff --git a/libctru/include/3ds/CSND.h b/libctru/include/3ds/CSND.h
index 3909cdc..6ac0b89 100644
--- a/libctru/include/3ds/CSND.h
+++ b/libctru/include/3ds/CSND.h
@@ -3,6 +3,19 @@
 
 #define CSND_SHAREDMEM_DEFAULT 0x10004000
 
+typedef enum{
+    CSND_LOOP_DISABLE,
+    CSND_LOOP_ENABLE
+} CSND_LOOPING;
+
+typedef enum{
+    CSND_ENCODING_PCM8,
+    CSND_ENCODING_PCM16,
+    CSND_ENCODING_IMA_ADPCM,
+    CSND_ENCODING_PSG//"3 = PSG, similar to DS?"
+} CSND_ENCODING;
+
+
 //See here regarding CSND shared-mem commands, etc: http://3dbrew.org/wiki/CSND_Shared_Memory
 
 Result CSND_initialize(u32* sharedMem);
diff --git a/libctru/include/3ds/gfx.h b/libctru/include/3ds/gfx.h
index 27f941b..4f8c650 100644
--- a/libctru/include/3ds/gfx.h
+++ b/libctru/include/3ds/gfx.h
@@ -27,6 +27,7 @@ void gfxSwapBuffers();
 
 //helper stuff
 u8* gfxGetFramebuffer(gfxScreen_t screen, gfx3dSide_t side, u16* width, u16* height);
+void* gfxAllocLinear(size_t size);
 
 //global variables
 extern u8* gfxTopLeftFramebuffers[2];
diff --git a/libctru/source/gfx.c b/libctru/source/gfx.c
index 0b5422d..fa6fa78 100644
--- a/libctru/source/gfx.c
+++ b/libctru/source/gfx.c
@@ -21,6 +21,25 @@ Handle gspEvent, gspSharedMemHandle;
 
 u8* gspHeap;
 u32* gxCmdBuf;
+extern u32 __gsp_heap_size;
+
+
+
+// TODO: this function is not thread-safe and you cannot 'free' this memory.
+void* gfxAllocLinear(size_t size)
+{
+    static size_t currentOffset = 0;
+    size_t free = __gsp_heap_size - currentOffset;
+
+    if(free >= size)
+    {
+        currentOffset += size;
+        return (void*) &gspHeap[currentOffset - size];
+    }
+
+    return NULL;
+}
+
 
 void gfxSet3D(bool enable)
 {
@@ -51,8 +70,6 @@ void gfxSetFramebufferInfo(gfxScreen_t screen, u8 id)
 	}
 }
 
-extern u32 __gsp_heap_size;
-
 void gfxInit()
 {
 	gspInit();
@@ -78,12 +95,12 @@ void gfxInit()
 	//		topright1 0x000FD200-0x00143700
 	//		topright2 0x00143700-0x00189C00
 
-	gfxTopLeftFramebuffers[0]=(u8*)gspHeap;
-	gfxTopLeftFramebuffers[1]=gfxTopLeftFramebuffers[0]+0x46500;
-	gfxBottomFramebuffers[0]=gfxTopLeftFramebuffers[1]+0x46500;
-	gfxBottomFramebuffers[1]=gfxBottomFramebuffers[0]+0x38400;
-	gfxTopRightFramebuffers[0]=gfxBottomFramebuffers[1]+0x38400;
-	gfxTopRightFramebuffers[1]=gfxTopRightFramebuffers[0]+0x46500;
+	gfxTopLeftFramebuffers[0]=gfxAllocLinear(0x46500);
+	gfxTopLeftFramebuffers[1]=gfxAllocLinear(0x46500);
+	gfxBottomFramebuffers[0]=gfxAllocLinear(0x38400);
+	gfxBottomFramebuffers[1]=gfxAllocLinear(0x38400);
+	gfxTopRightFramebuffers[0]=gfxAllocLinear(0x46500);
+	gfxTopRightFramebuffers[1]=gfxAllocLinear(0x46500);
 	enable3d=false;
 
 	//initialize framebuffer info structures