1 files changed, 118 insertions, 0 deletions
diff --git a/Source/Images/texture_data.h b/Source/Images/texture_data.h
new file mode 100644
index 00000000..975a3034
--- /dev/null
+++ b/Source/Images/texture_data.h
@@ -0,0 +1,118 @@
+//-----------------------------------------------------------------------------
+//           Name: texture_data.h
+//      Developer: Wolfire Games LLC
+//         Author: Phillip Isola
+//    Description: Generic storage texture image data.
+//                 Reading and writing from/to various image formats.
+//        License: Read below
+//-----------------------------------------------------------------------------
+//
+//   Copyright 2022 Wolfire Games LLC
+//
+//   Licensed under the Apache License, Version 2.0 (the "License");
+//   you may not use this file except in compliance with the License.
+//   You may obtain a copy of the License at
+//
+//       http://www.apache.org/licenses/LICENSE-2.0
+//
+//   Unless required by applicable law or agreed to in writing, software
+//   distributed under the License is distributed on an "AS IS" BASIS,
+//   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+//   See the License for the specific language governing permissions and
+//   limitations under the License.
+//
+//-----------------------------------------------------------------------------
+#pragma once
+
+#include <Wrappers/crn.h>
+
+#include <opengl.h>
+
+#include <ostream>
+#include <vector>
+
+class StackAllocator;
+
+class TextureData {
+public:
+    enum ColorSpace {
+        Linear
+        , sRGB
+    };
+
+    enum ConversionQuality {
+        Nice
+        , Fast
+    };
+
+    TextureData() :
+        m_colorSpace(Linear),
+        is_loaded(false),
+        height(0),
+        width(0),
+        num_faces(0),
+        mip_levels(0),
+        gl_base_format(GL_NONE),
+        gl_internal_format(GL_NONE),
+        gl_type(GL_NONE)
+         {}
+    
+    bool IsCube() const;
+    bool IsCompressed() const;
+    bool HasMipmaps() const;
+    unsigned int GetWidth() const;
+    unsigned int GetHeight() const;
+    unsigned int GetMipWidth(unsigned int mip) const;
+    unsigned int GetMipHeight(unsigned int mip) const;
+    unsigned int GetNumFaces() const;
+    unsigned int GetMipLevels() const;
+    GLenum GetGLBaseFormat() const;     // for glTexImage2D, may only be called on uncompressed textures
+    GLenum GetGLInternalFormat() const;
+    GLenum GetGLType() const;           // for glTexImage2D, may only be called on uncompressed textures
+    ColorSpace GetColorSpace() const { return m_colorSpace; }
+    unsigned int GetMipDataSize(unsigned int face, unsigned int mip) const;
+    const char* GetMipData(unsigned int face, unsigned int mip) const;
+    void GetUncompressedData(unsigned char* data);
+    void SetColorSpace(ColorSpace color_space);
+
+    bool Load(const char *abs_path);
+    bool EnsureInRAM();
+
+    bool GenerateMipmaps();
+    bool ConvertDXT(crnlib::pixel_format format, ConversionQuality quality);
+    bool SaveDDS(const char *abs_path);
+    bool SaveCRN(const char *abs_path, crn_format format, ConversionQuality quality);
+
+    bool IsInRAM();
+    void UnloadData();
+
+    inline std::string GetPath() { return source_path; }
+
+private:
+    std::string source_path;
+
+    void ExtractMetaData();
+
+    bool is_loaded;
+    bool is_cube;
+    bool is_packed;
+    unsigned int width, height;
+    std::vector<int> mip_widths; 
+    std::vector<int> mip_heights;
+    std::vector<int> mip_data_sizes;
+    int num_faces, mip_levels;
+    GLenum gl_base_format, gl_internal_format, gl_type;
+    int mip_data_size;
+
+    crnlib::mipmapped_texture m_crnTex;
+    ColorSpace m_colorSpace;
+};
+
+inline std::ostream& operator<<(std::ostream& out, const TextureData& td )
+{
+    unsigned int totalBytes = td.GetWidth() * td.GetHeight() * 32 / 8;
+    out << "TextureData(w:" << td.GetWidth() << ",h:" << td.GetHeight() << ",size:" << totalBytes << ")";
+    return out;
+}
+
+bool IsPow2(int v);