ClearBuffers not yet working. SAD!

nx/include/switch.h

@@ -69,6 +69,7 @@ extern "C" {
 #include "switch/nvidia/gpu/error_notifier.h"
 #include "switch/nvidia/gpu/gpu.h"
 #include "switch/nvidia/cmds/common.h"
+#include "switch/nvidia/cmds/3d.h"
 
 #include "switch/runtime/env.h"
 

nx/include/switch/nvidia/cmds/3d.h

@@ -1,3 +1,18 @@
 enum {
-    NvReg3D_MultisampleEnable = 0x54d
+    NvReg3D_ClearColor = 0x360,
+    NvReg3D_ScreenScissorHorizontal = 0x3fd,
+    NvReg3D_ScreenScissorVertical = 0x3fe,
+    NvReg3D_RenderTargetControl = 0x487,
+    NvReg3D_RenderTargetNAddr = 0x200,
+    NvReg3D_RenderTargetNHorizontal = 0x202,
+    NvReg3D_RenderTargetNVertical = 0x203,
+    NvReg3D_RenderTargetNFormat = 0x204,
+    NvReg3D_RenderTargetNTileMode = 0x205,
+    NvReg3D_RenderTargetNArrayMode = 0x206,
+    NvReg3D_RenderTargetNLayerStride = 0x207,
+    NvReg3D_RenderTargetNBaseLayer = 0x208,
+    NvReg3D_MultisampleEnable = 0x54d,
+    NvReg3D_ClearBufferTrigger = 0x674,
 };
+
+void nvCmdsClearColor(NvCmdList* cmds, float colors[4]);

nx/include/switch/nvidia/gpu/cmd_list.h

@@ -29,3 +29,8 @@ u32*   nvCmdListInsert(NvCmdList* c, size_t num_cmds);
 
 #define NvIncrOnce(subc, reg, ...) \
     (0xA0000000 | ((reg) | ((subc) << 13) | ((sizeof((u32[]) { __VA_ARGS__ })) << 16))), __VA_ARGS__
+
+static inline u32 f2i(float f) {
+    #pragma GCC diagnostic ignored "-Wstrict-aliasing"
+    return *(u32*) &f;
+}

nx/source/nvidia/cmds/3d.c

@@ -1,2 +1,32 @@
 #include <switch.h>
+#include <string.h>
 
+void nvCmdsClearBuffer(
+    NvCmdList* cmds, NvBuffer* buf, u32 width, u32 height, float colors[4])
+{
+    NvCmd(cmds, NvIncr(0, NvReg3D_ClearColor,
+        f2i(colors[0]), f2i(colors[1]), f2i(colors[2]), f2i(colors[3])));
+    NvCmd(cmds, NvIncr(0, NvReg3D_ScreenScissorHorizontal,
+                       0 | (0x100 << 16), 0 | (0x100 << 16)));
+    NvCmd(cmds, NvImm(0, NvReg3D_RenderTargetControl, 1)); // bit0 probably enables RT #0
+
+    iova_t gpu_addr = nvBufferGetGpuAddr(buf);
+    NvCmd(cmds, NvIncr(NvReg3D_RenderTargetNAddr + 0x10*0,
+                       gpu_addr >> 32, gpu_addr,
+                       width, height,
+                       0xfe /* Format */,
+                       0x1000 /* TileMode */,
+                       1 /* ArrayMode */,
+                       0 /* Stride */,
+                       0 /* BaseLayer */
+              ));
+    int z;
+    for (z=0; z<32; z++)
+        NvCmd(cmds, NvImm(0, NvReg3D_ClearBufferTrigger, 0x3c | (z << 10)));
+    /*
+      TODO:
+    IMMED_NVC0(push, NVC0_3D(ZETA_ENABLE), 0);
+    IMMED_NVC0(push, NVC0_3D(MULTISAMPLE_MODE), 0);
+    */
+    
+}