From fb371390737dae683b775efbf7d296c37494c31c Mon Sep 17 00:00:00 2001
From: Dan Paulat <dpaulat@gmail.com>
Date: Thu, 6 Oct 2022 00:32:15 -0500
Subject: [PATCH] Manage texture atlas in GL context

---
 scwx-qt/source/scwx/qt/gl/gl_context.cpp | 15 +++++++++++++++
 scwx-qt/source/scwx/qt/gl/gl_context.hpp |  1 +
 2 files changed, 16 insertions(+)

diff --git a/scwx-qt/source/scwx/qt/gl/gl_context.cpp b/scwx-qt/source/scwx/qt/gl/gl_context.cpp
index 31f65de3..e7657b03 100644
--- a/scwx-qt/source/scwx/qt/gl/gl_context.cpp
+++ b/scwx-qt/source/scwx/qt/gl/gl_context.cpp
@@ -1,5 +1,6 @@
 #include <scwx/qt/gl/gl_context.hpp>
 #include <scwx/qt/util/streams.hpp>
+#include <scwx/qt/util/texture_atlas.hpp>
 #include <scwx/util/hash.hpp>
 #include <scwx/util/logger.hpp>
 
@@ -29,6 +30,7 @@ public:
        shaderProgramMap_ {},
        shaderProgramMutex_ {},
        textureMap_ {},
+       textureAtlas_ {GL_INVALID_INDEX},
        textureMutex_ {}
    {
    }
@@ -45,6 +47,7 @@ public:
    std::mutex shaderProgramMutex_;
 
    std::unordered_map<std::string, GLuint> textureMap_;
+   GLuint                                  textureAtlas_;
    std::mutex                              textureMutex_;
 };
 
@@ -84,6 +87,18 @@ GlContext::GetShaderProgram(const std::string& vertexPath,
    return shaderProgram;
 }
 
+GLuint GlContext::GetTextureAtlas()
+{
+   std::unique_lock lock(p->textureMutex_);
+
+   if (p->textureAtlas_ == GL_INVALID_INDEX)
+   {
+      p->textureAtlas_ = util::TextureAtlas::Instance().BufferAtlas(p->gl_);
+   }
+
+   return p->textureAtlas_;
+}
+
 GLuint GlContext::GetTexture(const std::string& texturePath)
 {
    GLuint texture = GL_INVALID_INDEX;
diff --git a/scwx-qt/source/scwx/qt/gl/gl_context.hpp b/scwx-qt/source/scwx/qt/gl/gl_context.hpp
index d1fb6645..69802534 100644
--- a/scwx-qt/source/scwx/qt/gl/gl_context.hpp
+++ b/scwx-qt/source/scwx/qt/gl/gl_context.hpp
@@ -28,6 +28,7 @@ public:
    GetShaderProgram(const std::string& vertexPath,
                     const std::string& fragmentPath);
 
+   GLuint GetTextureAtlas();
    GLuint GetTexture(const std::string& texturePath);
 
 private: