Add test ROMs for detecting emulators

tests/DetectEmulator/source/main.c

@@ -0,0 +1,181 @@
+#include <3ds.h>
+#include <citro3d.h>
+#include <string.h>
+#include "vshader_shbin.h"
+
+#define CLEAR_COLOR 0x68B0D8FF
+
+#define DISPLAY_TRANSFER_FLAGS \
+	(GX_TRANSFER_FLIP_VERT(0) | GX_TRANSFER_OUT_TILED(0) | GX_TRANSFER_RAW_COPY(0) | \
+	GX_TRANSFER_IN_FORMAT(GX_TRANSFER_FMT_RGBA8) | GX_TRANSFER_OUT_FORMAT(GX_TRANSFER_FMT_RGB8) | \
+	GX_TRANSFER_SCALING(GX_TRANSFER_SCALE_NO))
+
+typedef struct { float x, y, z; } vertex;
+
+static const vertex vertex_list[] = {
+	{ 200.0f, 200.0f, 0.5f },
+	{ 100.0f, 40.0f, 0.5f },
+	{ 300.0f, 40.0f, 0.5f },
+};
+
+typedef enum {
+    Platform_Citra,
+    Platform_Panda,
+    Platform_Other
+} Platform;
+
+typedef enum {
+    SystemInfo_Citra = 0x20000,
+    SystemInfo_Panda = 0x20001
+} SystemInfoType;
+
+typedef enum {
+    SystemInfoSub_IsCitra = 0,
+    SystemInfoSub_IsPanda = 0,
+} SystemInfoSubType;
+
+// Detect the emulator this is running on
+Platform getPlatform() {
+    s64 out;
+
+    // First, attempt to detect Citra
+    Result res = svcGetSystemInfo(&out, SystemInfo_Citra, SystemInfoSub_IsCitra);
+    if (R_SUCCEEDED(res) && out == 1) {
+        return Platform_Citra;
+    }
+    
+    // Next, attempt to detect Panda3DS
+    res = svcGetSystemInfo(&out, SystemInfo_Panda, SystemInfoSub_IsPanda);
+    if (R_SUCCEEDED(res) && out == 1) {
+        return Platform_Panda;
+    }
+
+    // Unknown platform, maybe a console or another emulator
+    return Platform_Other;
+}
+
+// Print string in emulator terminal
+static void emuPrint(const char* str) {
+    svcOutputDebugString(str, strlen(str));
+}
+
+#define vertex_list_count (sizeof(vertex_list)/sizeof(vertex_list[0]))
+
+static DVLB_s* vshader_dvlb;
+static shaderProgram_s program;
+static int uLoc_projection;
+static C3D_Mtx projection;
+
+static void* vbo_data;
+
+static void sceneInit(void) {
+	// Load the vertex shader, create a shader program and bind it
+	vshader_dvlb = DVLB_ParseFile((u32*)vshader_shbin, vshader_shbin_size);
+	shaderProgramInit(&program);
+	shaderProgramSetVsh(&program, &vshader_dvlb->DVLE[0]);
+	C3D_BindProgram(&program);
+
+	// Get the location of the uniforms
+	uLoc_projection = shaderInstanceGetUniformLocation(program.vertexShader, "projection");
+
+	// Configure attributes for use with the vertex shader
+	C3D_AttrInfo* attrInfo = C3D_GetAttrInfo();
+	AttrInfo_Init(attrInfo);
+	AttrInfo_AddLoader(attrInfo, 0, GPU_FLOAT, 3); // v0=position
+	AttrInfo_AddFixed(attrInfo, 1); // v1=color
+
+	// Set the fixed attribute (color) to a colour depending on the emulator
+
+    Platform platform = getPlatform();
+    switch (platform) {
+        case Platform_Citra:
+            emuPrint("Detected Citra\n");
+            C3D_FixedAttribSet(1, 1.0, 1.0, 0.0, 1.0);
+            break;
+        
+        case Platform_Panda:
+            emuPrint("Detected Panda3DS\n");
+            C3D_FixedAttribSet(1, 1.0, 0.0, 0.0, 1.0);
+            break;
+
+        default:
+            emuPrint("Unknown platform. Probably a real 3DS\n");
+            C3D_FixedAttribSet(1, 1.0, 0.5, 0.2, 1.0);
+            break;
+    }
+
+	// Compute the projection matrix
+	Mtx_OrthoTilt(&projection, 0.0, 400.0, 0.0, 240.0, 0.0, 1.0, true);
+
+	// Create the VBO (vertex buffer object)
+	vbo_data = linearAlloc(sizeof(vertex_list));
+	memcpy(vbo_data, vertex_list, sizeof(vertex_list));
+
+	// Configure buffers
+	C3D_BufInfo* bufInfo = C3D_GetBufInfo();
+	BufInfo_Init(bufInfo);
+	BufInfo_Add(bufInfo, vbo_data, sizeof(vertex), 1, 0x0);
+
+	// Configure the first fragment shading substage to just pass through the vertex color
+	// See https://www.opengl.org/sdk/docs/man2/xhtml/glTexEnv.xml for more insight
+	C3D_TexEnv* env = C3D_GetTexEnv(0);
+	C3D_TexEnvInit(env);
+	C3D_TexEnvSrc(env, C3D_Both, GPU_PRIMARY_COLOR, 0, 0);
+	C3D_TexEnvFunc(env, C3D_Both, GPU_REPLACE);
+}
+
+static void sceneRender(void) {
+	// Update the uniforms
+	C3D_FVUnifMtx4x4(GPU_VERTEX_SHADER, uLoc_projection, &projection);
+
+	// Draw the VBO
+	C3D_DrawArrays(GPU_TRIANGLES, 0, vertex_list_count);
+}
+
+static void sceneExit(void) {
+	// Free the VBO
+	linearFree(vbo_data);
+
+	// Free the shader program
+	shaderProgramFree(&program);
+	DVLB_Free(vshader_dvlb);
+}
+
+int main() {
+    emuPrint("Entering main\n");
+	// Initialize graphics
+	gfxInitDefault();
+	C3D_Init(C3D_DEFAULT_CMDBUF_SIZE);
+
+	// Initialize the render target
+	C3D_RenderTarget* target = C3D_RenderTargetCreate(240, 400, GPU_RB_RGBA8, GPU_RB_DEPTH24_STENCIL8);
+	C3D_RenderTargetSetOutput(target, GFX_TOP, GFX_LEFT, DISPLAY_TRANSFER_FLAGS);
+
+	// Initialize the scene
+	sceneInit();
+
+	// Main loop
+	while (true)
+	{
+		// Render the scene
+        emuPrint("Entering C3D_FrameBegin");
+		C3D_FrameBegin(C3D_FRAME_SYNCDRAW);
+            emuPrint("Clearing render target");
+			C3D_RenderTargetClear(target, C3D_CLEAR_ALL, CLEAR_COLOR, 0);
+            emuPrint("Calling C3D_FrameDrawOn");
+			C3D_FrameDrawOn(target);
+            emuPrint("Calling sceneRender");
+			sceneRender();
+            emuPrint("Entering C3D_FrameEnd");
+		C3D_FrameEnd(0);
+        emuPrint("Exited C3D_FrameEnd");
+	}
+
+	// Deinitialize the scene
+	sceneExit();
+
+	// Deinitialize graphics
+	C3D_Fini();
+	gfxExit();
+	return 0;
+}