From 6f8c0c6c088be92804cb413c0234bfb817ef2d8d Mon Sep 17 00:00:00 2001
From: Mikko Rasa <tdb@tdb.fi>
Date: Fri, 28 Oct 2016 14:55:23 +0300
Subject: [PATCH] Prefer explicit mipmap generation with glGenerateMipmap

Implicit generation with the texture parameter was deprecated in
OpenGL 3.0 and removed in OpenGL 3.2.
---
 source/texture.cpp     | 11 ++++-------
 source/texture1d.cpp   |  9 ++++++---
 source/texture2d.cpp   |  9 ++++++---
 source/texture3d.cpp   |  9 ++++++---
 source/texturecube.cpp |  9 ++++++---
 5 files changed, 28 insertions(+), 19 deletions(-)

diff --git a/source/texture.cpp b/source/texture.cpp
index b528ca30..fe27a04d 100644
--- a/source/texture.cpp
+++ b/source/texture.cpp
@@ -172,21 +172,18 @@ void Texture::set_wrap_r(TextureWrap w)
 
 void Texture::set_generate_mipmap(bool gm)
 {
-	if(gm)
+	if(gm && !EXT_framebuffer_object)
 		static Require _req(SGIS_generate_mipmap);
 	gen_mipmap = gm;
-	if(get_gl_api()!=OPENGL_ES2)
+	if(!EXT_framebuffer_object)
 		update_parameter(GENERATE_MIPMAP);
 }
 
 void Texture::auto_generate_mipmap()
 {
-	if(get_gl_api()==OPENGL_ES2)
-	{
-		// glGenerateMipmap is defined here
-		static Require _req(EXT_framebuffer_object);
+	// glGenerateMipmap is defined here
+	if(EXT_framebuffer_object)
 		glGenerateMipmap(target);
-	}
 }
 
 void Texture::set_compare_enabled(bool c)
diff --git a/source/texture1d.cpp b/source/texture1d.cpp
index 44e49f51..e5a496a4 100644
--- a/source/texture1d.cpp
+++ b/source/texture1d.cpp
@@ -61,9 +61,9 @@ void Texture1D::image(unsigned level, PixelFormat fmt, DataType type, const void
 
 	BindRestore _bind(this);
 	if(ARB_texture_storage)
-		sub_image(level, 0, w, fmt, type, data);
-	else
-		glTexImage1D(target, level, ifmt, w, 0, fmt, type, data);
+		return sub_image(level, 0, w, fmt, type, data);
+
+	glTexImage1D(target, level, ifmt, w, 0, fmt, type, data);
 
 	allocated |= 1<<level;
 	if(gen_mipmap && level==0)
@@ -82,6 +82,9 @@ void Texture1D::sub_image(unsigned level, int x, unsigned wd, PixelFormat fmt, D
 
 	BindRestore _bind(this);
 	glTexSubImage1D(target, level, x, wd, fmt, type, data);
+
+	if(gen_mipmap && level==0)
+		auto_generate_mipmap();
 }
 
 void Texture1D::image(const Graphics::Image &img, bool srgb)
diff --git a/source/texture2d.cpp b/source/texture2d.cpp
index 4aad82d2..4d6e32f5 100644
--- a/source/texture2d.cpp
+++ b/source/texture2d.cpp
@@ -91,9 +91,9 @@ void Texture2D::image(unsigned level, PixelFormat fmt, DataType type, const void
 
 	BindRestore _bind(this);
 	if(ARB_texture_storage)
-		sub_image(level, 0, 0, w, h, fmt, type, data);
-	else
-		glTexImage2D(target, level, ifmt, w, h, 0, fmt, type, data);
+		return sub_image(level, 0, 0, w, h, fmt, type, data);
+
+	glTexImage2D(target, level, ifmt, w, h, 0, fmt, type, data);
 
 	allocated |= 1<<level;
 	if(gen_mipmap && level==0)
@@ -112,6 +112,9 @@ void Texture2D::sub_image(unsigned level, int x, int y, unsigned wd, unsigned ht
 
 	BindRestore _bind(this);
 	glTexSubImage2D(target, level, x, y, wd, ht, fmt, type, data);
+
+	if(gen_mipmap && level==0)
+		auto_generate_mipmap();
 }
 
 void Texture2D::image(const Graphics::Image &img, bool srgb)
diff --git a/source/texture3d.cpp b/source/texture3d.cpp
index d04a17e1..7ea17b13 100644
--- a/source/texture3d.cpp
+++ b/source/texture3d.cpp
@@ -80,9 +80,9 @@ void Texture3D::image(unsigned level, PixelFormat fmt, DataType type, const void
 
 	BindRestore _bind(this);
 	if(ARB_texture_storage)
-		sub_image(level, 0, 0, 0, w, h, d, fmt, type, data);
-	else
-		glTexImage3D(target, level, ifmt, width, height, depth, 0, fmt, type, data);
+		return sub_image(level, 0, 0, 0, w, h, d, fmt, type, data);
+
+	glTexImage3D(target, level, ifmt, width, height, depth, 0, fmt, type, data);
 
 	allocated |= 1<<level;
 	if(gen_mipmap && level==0)
@@ -101,6 +101,9 @@ void Texture3D::sub_image(unsigned level, int x, int y, int z, unsigned wd, unsi
 
 	BindRestore _bind(this);
 	glTexSubImage3D(target, level, x, y, z, wd, ht, dp, fmt, type, data);
+
+	if(gen_mipmap && level==0)
+		auto_generate_mipmap();
 }
 
 void Texture3D::load_image(const string &fn, int dp)
diff --git a/source/texturecube.cpp b/source/texturecube.cpp
index 54a008ca..a9961af9 100644
--- a/source/texturecube.cpp
+++ b/source/texturecube.cpp
@@ -79,9 +79,9 @@ void TextureCube::image(TextureCubeFace face, unsigned level, PixelFormat fmt, D
 
 	BindRestore _bind(this);
 	if(ARB_texture_storage)
-		sub_image(face, level, 0, 0, s, s, fmt, type, data);
-	else
-		glTexImage2D(face, level, ifmt, s, s, 0, fmt, type, data);
+		return sub_image(face, level, 0, 0, s, s, fmt, type, data);
+
+	glTexImage2D(face, level, ifmt, s, s, 0, fmt, type, data);
 
 	// XXX Allocation should be tracked per-face, but we'll run out of bits
 	allocated |= 1<<level;
@@ -102,6 +102,9 @@ void TextureCube::sub_image(TextureCubeFace face, unsigned level, int x, int y,
 
 	BindRestore _bind(this);
 	glTexSubImage2D(face, level, x, y, wd, ht, fmt, type, data);
+
+	if(gen_mipmap && level==0)
+		auto_generate_mipmap();
 }
 
 void TextureCube::image(TextureCubeFace face, const Graphics::Image &img, bool srgb)
-- 
2.43.0