From 9e3839781fdf1b1c6a2d61a5de9b2c7ddd68e9ed Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Konstantin=20K=C3=A4fer?= <mail@kkaefer.com>
Date: Wed, 26 Oct 2016 16:39:25 -0700
Subject: [core] convert SpriteAtlas to use managed texture handling

---
 src/mbgl/gl/context.cpp | 12 +++++++++---
 src/mbgl/gl/context.hpp |  7 +++++++
 2 files changed, 16 insertions(+), 3 deletions(-)

(limited to 'src/mbgl/gl')

diff --git a/src/mbgl/gl/context.cpp b/src/mbgl/gl/context.cpp
index acecf2b698..7200b75050 100644
--- a/src/mbgl/gl/context.cpp
+++ b/src/mbgl/gl/context.cpp
@@ -185,15 +185,21 @@ Framebuffer Context::createFramebuffer(const Texture& color) {
 UniqueTexture
 Context::createTexture(const Size size, const void* data, TextureUnit unit) {
     auto obj = createTexture();
-    activeTexture = unit;
-    texture[unit] = obj;
+    updateTexture(obj, size, data, unit);
+    // We are using clamp to edge here since OpenGL ES doesn't allow GL_REPEAT on NPOT textures.
+    // We use those when the pixelRatio isn't a power of two, e.g. on iPhone 6 Plus.
     MBGL_CHECK_ERROR(glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE));
     MBGL_CHECK_ERROR(glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE));
     MBGL_CHECK_ERROR(glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST));
     MBGL_CHECK_ERROR(glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST));
+    return obj;
+}
+
+void Context::updateTexture(TextureID id, const Size size, const void* data, TextureUnit unit) {
+    activeTexture = unit;
+    texture[unit] = id;
     MBGL_CHECK_ERROR(glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, size.width, size.height, 0, GL_RGBA,
                                   GL_UNSIGNED_BYTE, data));
-    return obj;
 }
 
 void Context::bindTexture(Texture& obj,
diff --git a/src/mbgl/gl/context.hpp b/src/mbgl/gl/context.hpp
index 84c83f8d31..ae2b71994f 100644
--- a/src/mbgl/gl/context.hpp
+++ b/src/mbgl/gl/context.hpp
@@ -68,6 +68,12 @@ public:
         return { image.size, createTexture(image.size, image.data.get(), unit) };
     }
 
+    template <typename Image>
+    void updateTexture(Texture& obj, const Image& image, TextureUnit unit = 0) {
+        updateTexture(obj.texture.get(), image.size, image.data.get(), unit);
+        obj.size = image.size;
+    }
+
     // Creates an empty texture with the specified dimensions.
     Texture createTexture(const Size size, TextureUnit unit = 0) {
         return { size, createTexture(size, nullptr, unit) };
@@ -148,6 +154,7 @@ private:
     UniqueBuffer createVertexBuffer(const void* data, std::size_t size);
     UniqueBuffer createIndexBuffer(const void* data, std::size_t size);
     UniqueTexture createTexture(Size size, const void* data, TextureUnit);
+    void updateTexture(TextureID, Size size, const void* data, TextureUnit);
     UniqueFramebuffer createFramebuffer();
     UniqueRenderbuffer createRenderbuffer(RenderbufferType, Size size);
 
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