From 8682485dea3768595416f0a580d0d1216a997db5 Mon Sep 17 00:00:00 2001
From: Jack Andersen <jackoalan@gmail.com>
Date: Sun, 22 Nov 2015 22:49:53 -1000
Subject: [PATCH] Added array texture factory method (OGL only right now)

---
 include/boo/graphicsdev/GL.hpp                |  2 ++
 .../boo/graphicsdev/IGraphicsDataFactory.hpp  |  4 +++
 lib/graphicsdev/GL.cpp                        | 36 +++++++++++++++++++
 3 files changed, 42 insertions(+)

diff --git a/include/boo/graphicsdev/GL.hpp b/include/boo/graphicsdev/GL.hpp
index a94af9d..a5a3203 100644
--- a/include/boo/graphicsdev/GL.hpp
+++ b/include/boo/graphicsdev/GL.hpp
@@ -31,6 +31,8 @@ public:
                                 const void* data, size_t sz);
     ITextureS* newStaticTexture(size_t width, size_t height, size_t mips, TextureFormat fmt,
                                 std::unique_ptr<uint8_t[]>&& data, size_t sz);
+    ITextureS* newStaticArrayTexture(size_t width, size_t height, size_t layers, TextureFormat fmt,
+                                    const void* data, size_t sz);
     ITextureD* newDynamicTexture(size_t width, size_t height, TextureFormat fmt);
     ITextureR* newRenderTexture(size_t width, size_t height, size_t samples);
 
diff --git a/include/boo/graphicsdev/IGraphicsDataFactory.hpp b/include/boo/graphicsdev/IGraphicsDataFactory.hpp
index 88d6501..2483b00 100644
--- a/include/boo/graphicsdev/IGraphicsDataFactory.hpp
+++ b/include/boo/graphicsdev/IGraphicsDataFactory.hpp
@@ -87,6 +87,7 @@ protected:
 enum class TextureFormat
 {
     RGBA8,
+    I8,
     DXT1,
     PVRTC4
 };
@@ -180,6 +181,9 @@ struct IGraphicsDataFactory
     virtual ITextureS*
     newStaticTexture(size_t width, size_t height, size_t mips, TextureFormat fmt,
                      std::unique_ptr<uint8_t[]>&& data, size_t sz)=0;
+    virtual ITextureS*
+    newStaticArrayTexture(size_t width, size_t height, size_t layers, TextureFormat fmt,
+                          const void* data, size_t sz)=0;
     virtual ITextureD*
     newDynamicTexture(size_t width, size_t height, TextureFormat fmt)=0;
     virtual ITextureR*
diff --git a/lib/graphicsdev/GL.cpp b/lib/graphicsdev/GL.cpp
index 483e9f8..067890e 100644
--- a/lib/graphicsdev/GL.cpp
+++ b/lib/graphicsdev/GL.cpp
@@ -19,6 +19,7 @@ struct GLData : IGraphicsData
     std::vector<std::unique_ptr<class GLGraphicsBufferS>> m_SBufs;
     std::vector<std::unique_ptr<class GLGraphicsBufferD>> m_DBufs;
     std::vector<std::unique_ptr<class GLTextureS>> m_STexs;
+    std::vector<std::unique_ptr<class GLArrayTextureS>> m_SATexs;
     std::vector<std::unique_ptr<class GLTextureD>> m_DTexs;
     std::vector<std::unique_ptr<class GLTextureR>> m_RTexs;
     std::vector<std::unique_ptr<struct GLVertexFormat>> m_VFmts;
@@ -136,6 +137,32 @@ public:
     }
 };
 
+class GLArrayTextureS : public ITextureS
+{
+    friend class GLDataFactory;
+    GLuint m_tex;
+    GLArrayTextureS(size_t width, size_t height, size_t layers,
+                    TextureFormat fmt, const void* data, size_t sz)
+    {
+        glGenTextures(1, &m_tex);
+        glBindTexture(GL_TEXTURE_2D_ARRAY, m_tex);
+        glTexParameteri(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+        glTexParameteri(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+        if (fmt == TextureFormat::RGBA8)
+            glTexImage3D(GL_TEXTURE_2D_ARRAY, 0, GL_RGBA, width, height, layers, 0, GL_RGBA, GL_UNSIGNED_BYTE, data);
+        else if (fmt == TextureFormat::I8)
+            glTexImage3D(GL_TEXTURE_2D_ARRAY, 0, GL_R8, width, height, layers, 0, GL_RED, GL_UNSIGNED_BYTE, data);
+    }
+public:
+    ~GLArrayTextureS() {glDeleteTextures(1, &m_tex);}
+
+    void bind(size_t idx) const
+    {
+        glActiveTexture(GL_TEXTURE0 + idx);
+        glBindTexture(GL_TEXTURE_2D_ARRAY, m_tex);
+    }
+};
+
 class GLTextureD : public ITextureD
 {
     friend class GLDataFactory;
@@ -207,6 +234,15 @@ GLDataFactory::newStaticTexture(size_t width, size_t height, size_t mips, Textur
     return retval;
 }
 
+ITextureS*
+GLDataFactory::newStaticArrayTexture(size_t width, size_t height, size_t layers, TextureFormat fmt,
+                                     const void *data, size_t sz)
+{
+    GLArrayTextureS* retval = new GLArrayTextureS(width, height, layers, fmt, data, sz);
+    static_cast<GLData*>(m_deferredData)->m_SATexs.emplace_back(retval);
+    return retval;
+}
+
 class GLShaderPipeline : public IShaderPipeline
 {
     friend class GLDataFactory;