Pica: Add debug utility functions for dumping geometry data.

src/video_core/debug_utils/debug_utils.cpp

@@ -0,0 +1,60 @@
+// Copyright 2014 Citra Emulator Project
+// Licensed under GPLv2
+// Refer to the license.txt file included.
+
+#include <fstream>
+#include <string>
+
+#include "video_core/pica.h"
+
+#include "debug_utils.h"
+
+namespace Pica {
+
+namespace DebugUtils {
+
+void GeometryDumper::AddVertex(std::array<float,3> pos, TriangleTopology topology) {
+    vertices.push_back({pos[0], pos[1], pos[2]});
+
+    int num_vertices = vertices.size();
+
+    switch (topology) {
+    case TriangleTopology::List:
+    case TriangleTopology::ListIndexed:
+        if (0 == (num_vertices % 3))
+            faces.push_back({ num_vertices-3, num_vertices-2, num_vertices-1 });
+        break;
+
+    default:
+        ERROR_LOG(GPU, "Unknown triangle topology %x", (int)topology);
+        exit(0);
+        break;
+    }
+}
+
+void GeometryDumper::Dump() {
+    // NOTE: Permanently enabling this just trashes hard disks for no reason.
+    //       Hence, this is currently disabled.
+    return;
+
+    static int index = 0;
+    std::string filename = std::string("geometry_dump") + std::to_string(++index) + ".obj";
+
+    std::ofstream file(filename);
+
+    for (const auto& vertex : vertices) {
+        file << "v " << vertex.pos[0]
+             << " "  << vertex.pos[1]
+             << " "  << vertex.pos[2] << std::endl;
+    }
+
+    for (const Face& face : faces) {
+        file << "f " << 1+face.index[0]
+             << " "  << 1+face.index[1]
+             << " "  << 1+face.index[2] << std::endl;
+    }
+}
+
+} // namespace
+
+} // namespace

src/video_core/debug_utils/debug_utils.h

@@ -0,0 +1,40 @@
+// Copyright 2014 Citra Emulator Project
+// Licensed under GPLv2
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <array>
+#include <vector>
+
+#include "video_core/pica.h"
+
+namespace Pica {
+
+namespace DebugUtils {
+
+using TriangleTopology = Regs::TriangleTopology;
+
+// Simple utility class for dumping geometry data to an OBJ file
+class GeometryDumper {
+public:
+    void AddVertex(std::array<float,3> pos, TriangleTopology topology);
+
+    void Dump();
+
+private:
+    struct Vertex {
+        std::array<float,3> pos;
+    };
+
+    struct Face {
+        int index[3];
+    };
+
+    std::vector<Vertex> vertices;
+    std::vector<Face> faces;
+};
+
+} // namespace
+
+} // namespace