GL: recognize {OES,EXT}_texture_view ES3.1+ extensions.

To match ARB_texture_view from from GL 4.3. Not sure why there's two of
them -- I was looking into the spec files, and the EXT variant seems to
be based on the OES variant but doesn't seem to add any change (or, no
change is listed), however the OES variant has number 218 while EXT has
185 so it's actually newer?! No idea what's happening there.

doc/opengl-support.dox

@@ -475,6 +475,7 @@ Extension                                   | Status
 @gl_extension{EXT,texture_compression_s3tc} | done
 @gl_extension{EXT,pvrtc_sRGB}               | done
 @gl_extension{EXT,shader_integer_mix}       | done (shading language only)
+@gl_extension{EXT,texture_view}             | |
 @gl_extension{EXT,draw_elements_base_vertex} | done
 @gl_extension{EXT,texture_norm16}           | done
 @gl_extension{EXT,texture_sRGB_R8}          | done
@@ -504,6 +505,7 @@ Extension                                   | Status
 @gl_extension{OES,stencil1}                 | done
 @gl_extension{OES,stencil4}                 | done
 @gl_extension{OES,texture_float_linear}     | done
+@gl_extension{OES,texture_view}             | |
 @gl_extension{OES,draw_elements_base_vertex} | done
 @gl_extension{OVR,multiview}                | |
 @gl_extension{OVR,multiview2}               | |

src/Magnum/GL/Context.cpp

@@ -394,6 +394,9 @@ constexpr Extension ExtensionList[]{
     Extensions::EXT::texture_sRGB_RG8{},
     #endif
     Extensions::EXT::texture_sRGB_decode{},
+    #ifndef MAGNUM_TARGET_GLES2
+    Extensions::EXT::texture_view{},
+    #endif
     Extensions::IMG::texture_compression_pvrtc{},
     Extensions::KHR::blend_equation_advanced_coherent{},
     Extensions::KHR::context_flush_control{},
@@ -424,6 +427,7 @@ constexpr Extension ExtensionList[]{
     #endif
     Extensions::OES::texture_float_linear{},
     #ifndef MAGNUM_TARGET_GLES2
+    Extensions::OES::texture_view{},
     Extensions::OVR::multiview{},
     #endif
     #ifndef MAGNUM_TARGET_GLES2

src/Magnum/GL/Extensions.h

@@ -463,23 +463,24 @@ namespace ANDROID {
     #ifndef MAGNUM_TARGET_GLES2
     _extension( 59,EXT,texture_buffer,              GLES310, GLES320) // #183
     _extension( 60,EXT,texture_cube_map_array,      GLES310, GLES320) // #184
-    _extension( 61,EXT,primitive_bounding_box,      GLES310, GLES320) // #186
+    _extension( 61,EXT,texture_view,                GLES310,    None) // #185
+    _extension( 62,EXT,primitive_bounding_box,      GLES310, GLES320) // #186
     #endif
-    _extension( 62,EXT,draw_elements_base_vertex,   GLES200,    None) // #204
+    _extension( 63,EXT,draw_elements_base_vertex,   GLES200,    None) // #204
     #ifndef MAGNUM_TARGET_GLES2
-    _extension( 63,EXT,texture_norm16,              GLES310,    None) // #207
+    _extension( 64,EXT,texture_norm16,              GLES310,    None) // #207
-    _extension( 64,EXT,texture_sRGB_R8,             GLES300,    None) // #221
+    _extension( 65,EXT,texture_sRGB_R8,             GLES300,    None) // #221
-    _extension( 65,EXT,texture_sRGB_RG8,            GLES300,    None) // #223
+    _extension( 66,EXT,texture_sRGB_RG8,            GLES300,    None) // #223
     #endif
-    _extension( 66,EXT,polygon_offset_clamp,        GLES200,    None) // #252
+    _extension( 67,EXT,polygon_offset_clamp,        GLES200,    None) // #252
     #ifndef MAGNUM_TARGET_GLES2
-    _extension( 67,EXT,clip_cull_distance,          GLES300,    None) // #257
+    _extension( 68,EXT,clip_cull_distance,          GLES300,    None) // #257
-    _extension( 68,EXT,texture_compression_rgtc,    GLES300,    None) // #286
+    _extension( 69,EXT,texture_compression_rgtc,    GLES300,    None) // #286
-    _extension( 69,EXT,texture_compression_bptc,    GLES300,    None) // #287
+    _extension( 70,EXT,texture_compression_bptc,    GLES300,    None) // #287
     #endif
-    _extension( 70,EXT,texture_compression_s3tc_srgb, GLES200,  None) // #289
+    _extension( 71,EXT,texture_compression_s3tc_srgb, GLES200,  None) // #289
 } namespace IMG {
-    _extension( 71,IMG,texture_compression_pvrtc,   GLES200,    None) // #54
+    _extension( 72,IMG,texture_compression_pvrtc,   GLES200,    None) // #54
 } namespace KHR {
     _extension( 80,KHR,texture_compression_astc_ldr,GLES200, GLES320) // #117
     _extension( 81,KHR,texture_compression_astc_hdr,GLES200,    None) // #117
@@ -562,16 +563,17 @@ namespace ANDROID {
     _extension(146,OES,texture_stencil8,            GLES200, GLES320) // #173
     #ifndef MAGNUM_TARGET_GLES2
     _extension(147,OES,texture_storage_multisample_2d_array, GLES310, GLES320) // #174
+    _extension(148,OES,texture_view,                GLES310,    None) // #218
     #endif
-    _extension(148,OES,draw_elements_base_vertex,   GLES200,    None) // #219
+    _extension(149,OES,draw_elements_base_vertex,   GLES200,    None) // #219
 } namespace OVR {
     #ifndef MAGNUM_TARGET_GLES2
-    _extension(149,OVR,multiview,                   GLES300,    None) // #241
+    _extension(150,OVR,multiview,                   GLES300,    None) // #241
-    _extension(150,OVR,multiview2,                  GLES300,    None) // #242
+    _extension(151,OVR,multiview2,                  GLES300,    None) // #242
     #endif
 } namespace MAGNUM {
     #ifndef MAGNUM_TARGET_GLES2
-    _extension(151,MAGNUM,shader_vertex_id,         GLES300, GLES300)
+    _extension(152,MAGNUM,shader_vertex_id,         GLES300, GLES300)
     #endif
 }
 #endif

src/MagnumExternal/OpenGL/GLES3/extensions.txt

@@ -18,6 +18,7 @@ extension EXT_tessellation_shader                   optional
 extension EXT_texture_border_clamp                  optional
 extension EXT_texture_buffer                        optional
 extension EXT_texture_cube_map_array                optional
+extension EXT_texture_view                          optional
 extension EXT_primitive_bounding_box                optional
 # extension KHR_texture_compression_astc_ldr        optional
 extension KHR_debug                                 optional
@@ -33,6 +34,7 @@ extension OES_shader_image_atomic                   optional
 extension OES_shader_multisample_interpolation      optional
 extension OES_texture_stencil8                      optional
 extension OES_texture_storage_multisample_2d_array  optional
+extension OES_texture_view                          optional
 
 extension ANDROID_extension_pack_es31a              optional
 # extension ANGLE_texture_compression_dxt1          optional

src/MagnumExternal/OpenGL/GLES3/flextGL.h

@@ -1300,6 +1300,14 @@ typedef void (APIENTRY *GLDEBUGPROCKHR)(GLenum source,GLenum type,GLuint id,GLen
 #define GL_INT_IMAGE_CUBE_MAP_ARRAY_EXT 0x905F
 #define GL_UNSIGNED_INT_IMAGE_CUBE_MAP_ARRAY_EXT 0x906A
 
+/* GL_EXT_texture_view */
+
+#define GL_TEXTURE_VIEW_MIN_LEVEL_EXT 0x82DB
+#define GL_TEXTURE_VIEW_NUM_LEVELS_EXT 0x82DC
+#define GL_TEXTURE_VIEW_MIN_LAYER_EXT 0x82DD
+#define GL_TEXTURE_VIEW_NUM_LAYERS_EXT 0x82DE
+#define GL_TEXTURE_IMMUTABLE_LEVELS 0x82DF
+
 /* GL_EXT_primitive_bounding_box */
 
 #define GL_PRIMITIVE_BOUNDING_BOX_EXT 0x92BE
@@ -1452,6 +1460,14 @@ typedef void (APIENTRY *GLDEBUGPROCKHR)(GLenum source,GLenum type,GLuint id,GLen
 #define GL_INT_SAMPLER_2D_MULTISAMPLE_ARRAY_OES 0x910C
 #define GL_UNSIGNED_INT_SAMPLER_2D_MULTISAMPLE_ARRAY_OES 0x910D
 
+/* GL_OES_texture_view */
+
+#define GL_TEXTURE_VIEW_MIN_LEVEL_OES 0x82DB
+#define GL_TEXTURE_VIEW_NUM_LEVELS_OES 0x82DC
+#define GL_TEXTURE_VIEW_MIN_LAYER_OES 0x82DD
+#define GL_TEXTURE_VIEW_NUM_LAYERS_OES 0x82DE
+#define GL_TEXTURE_IMMUTABLE_LEVELS 0x82DF
+
 /* GL_APPLE_texture_format_BGRA8888 */
 
 #define GL_BGRA_EXT 0x80E1
@@ -2225,6 +2241,10 @@ struct FlextGL {
     void(APIENTRY *TexBufferEXT)(GLenum, GLenum, GLuint);
     void(APIENTRY *TexBufferRangeEXT)(GLenum, GLenum, GLuint, GLintptr, GLsizeiptr);
 
+    /* GL_EXT_texture_view */
+
+    void(APIENTRY *TextureViewEXT)(GLuint, GLenum, GLuint, GLenum, GLuint, GLuint, GLuint, GLuint);
+
     /* GL_KHR_blend_equation_advanced */
 
     void(APIENTRY *BlendBarrierKHR)(void);
@@ -2285,6 +2305,10 @@ struct FlextGL {
 
     void(APIENTRY *TexStorage3DMultisampleOES)(GLenum, GLsizei, GLenum, GLsizei, GLsizei, GLsizei, GLboolean);
 
+    /* GL_OES_texture_view */
+
+    void(APIENTRY *TextureViewOES)(GLuint, GLenum, GLuint, GLenum, GLuint, GLuint, GLuint, GLuint);
+
     /* GL_OVR_multiview */
 
     void(APIENTRY *FramebufferTextureMultiviewOVR)(GLenum, GLenum, GLuint, GLint, GLint, GLsizei);
@@ -2568,6 +2592,10 @@ extern FLEXTGL_EXPORT FlextGL flextGL;
 #define glTexBufferEXT flextGL.TexBufferEXT
 #define glTexBufferRangeEXT flextGL.TexBufferRangeEXT
 
+/* GL_EXT_texture_view */
+
+#define glTextureViewEXT flextGL.TextureViewEXT
+
 /* GL_KHR_blend_equation_advanced */
 
 #define glBlendBarrierKHR flextGL.BlendBarrierKHR
@@ -2628,6 +2656,10 @@ extern FLEXTGL_EXPORT FlextGL flextGL;
 
 #define glTexStorage3DMultisampleOES flextGL.TexStorage3DMultisampleOES
 
+/* GL_OES_texture_view */
+
+#define glTextureViewOES flextGL.TextureViewOES
+
 /* GL_OVR_multiview */
 
 #define glFramebufferTextureMultiviewOVR flextGL.FramebufferTextureMultiviewOVR

src/MagnumExternal/OpenGL/GLES3/flextGLPlatform.cpp

@@ -289,6 +289,9 @@ void flextGLInit(Magnum::GL::Context&) {
     flextGL.TexBufferEXT = reinterpret_cast<void(APIENTRY*)(GLenum, GLenum, GLuint)>(loader.load("glTexBufferEXT"));
     flextGL.TexBufferRangeEXT = reinterpret_cast<void(APIENTRY*)(GLenum, GLenum, GLuint, GLintptr, GLsizeiptr)>(loader.load("glTexBufferRangeEXT"));
 
+    /* GL_EXT_texture_view */
+    flextGL.TextureViewEXT = reinterpret_cast<void(APIENTRY*)(GLuint, GLenum, GLuint, GLenum, GLuint, GLuint, GLuint, GLuint)>(loader.load("glTextureViewEXT"));
+
     /* GL_KHR_blend_equation_advanced */
     flextGL.BlendBarrierKHR = reinterpret_cast<void(APIENTRY*)(void)>(loader.load("glBlendBarrierKHR"));
 
@@ -339,6 +342,9 @@ void flextGLInit(Magnum::GL::Context&) {
     /* GL_OES_texture_storage_multisample_2d_array */
     flextGL.TexStorage3DMultisampleOES = reinterpret_cast<void(APIENTRY*)(GLenum, GLsizei, GLenum, GLsizei, GLsizei, GLsizei, GLboolean)>(loader.load("glTexStorage3DMultisampleOES"));
 
+    /* GL_OES_texture_view */
+    flextGL.TextureViewOES = reinterpret_cast<void(APIENTRY*)(GLuint, GLenum, GLuint, GLenum, GLuint, GLuint, GLuint, GLuint)>(loader.load("glTextureViewOES"));
+
     /* GL_OVR_multiview */
     flextGL.FramebufferTextureMultiviewOVR = reinterpret_cast<void(APIENTRY*)(GLenum, GLenum, GLuint, GLint, GLint, GLsizei)>(loader.load("glFramebufferTextureMultiviewOVR"));
 }

src/MagnumExternal/OpenGL/GLES3/flextGLPlatformIOS.cpp

@@ -129,6 +129,7 @@
 #undef glTexParameterIuivEXT
 #undef glTexBufferEXT
 #undef glTexBufferRangeEXT
+#undef glTextureViewEXT
 #undef glBlendBarrierKHR
 #undef glDebugMessageCallbackKHR
 #undef glDebugMessageControlKHR
@@ -159,6 +160,7 @@
 #undef glUnmapBufferOES
 #undef glMinSampleShadingOES
 #undef glTexStorage3DMultisampleOES
+#undef glTextureViewOES
 #undef glFramebufferTextureMultiviewOVR
 
 #define GLES_SILENCE_DEPRECATION /* YES I KNOW, APPLE! FFS */
@@ -342,6 +344,11 @@ void flextGLInit(Magnum::GL::Context&) {
     flextGL.TexBufferRangeEXT = reinterpret_cast<void(APIENTRY*)(GLenum, GLenum, GLuint, GLintptr, GLsizeiptr)>(glTexBufferRangeEXT);
     #endif
 
+    /* GL_EXT_texture_view */
+    #if GL_EXT_texture_view
+    flextGL.TextureViewEXT = reinterpret_cast<void(APIENTRY*)(GLuint, GLenum, GLuint, GLenum, GLuint, GLuint, GLuint, GLuint)>(glTextureViewEXT);
+    #endif
+
     /* GL_KHR_blend_equation_advanced */
     #if GL_KHR_blend_equation_advanced
     flextGL.BlendBarrierKHR = reinterpret_cast<void(APIENTRY*)(void)>(glBlendBarrierKHR);
@@ -412,6 +419,11 @@ void flextGLInit(Magnum::GL::Context&) {
     flextGL.TexStorage3DMultisampleOES = reinterpret_cast<void(APIENTRY*)(GLenum, GLsizei, GLenum, GLsizei, GLsizei, GLsizei, GLboolean)>(glTexStorage3DMultisampleOES);
     #endif
 
+    /* GL_OES_texture_view */
+    #if GL_OES_texture_view
+    flextGL.TextureViewOES = reinterpret_cast<void(APIENTRY*)(GLuint, GLenum, GLuint, GLenum, GLuint, GLuint, GLuint, GLuint)>(glTextureViewOES);
+    #endif
+
     /* GL_OVR_multiview */
     #if GL_OVR_multiview
     flextGL.FramebufferTextureMultiviewOVR = reinterpret_cast<void(APIENTRY*)(GLenum, GLenum, GLuint, GLint, GLint, GLsizei)>(glFramebufferTextureMultiviewOVR);

src/MagnumExternal/OpenGL/GLES3/flextGLPlatformWindowsDesktop.cpp

@@ -491,6 +491,9 @@ void flextGLInit(Magnum::GL::Context&) {
     flextGL.TexBufferEXT = reinterpret_cast<void(APIENTRY*)(GLenum, GLenum, GLuint)>(loader.load("glTexBufferEXT"));
     flextGL.TexBufferRangeEXT = reinterpret_cast<void(APIENTRY*)(GLenum, GLenum, GLuint, GLintptr, GLsizeiptr)>(loader.load("glTexBufferRangeEXT"));
 
+    /* GL_EXT_texture_view */
+    flextGL.TextureViewEXT = reinterpret_cast<void(APIENTRY*)(GLuint, GLenum, GLuint, GLenum, GLuint, GLuint, GLuint, GLuint)>(loader.load("glTextureViewEXT"));
+
     /* GL_KHR_blend_equation_advanced */
     flextGL.BlendBarrierKHR = reinterpret_cast<void(APIENTRY*)(void)>(loader.load("glBlendBarrierKHR"));
 
@@ -541,6 +544,9 @@ void flextGLInit(Magnum::GL::Context&) {
     /* GL_OES_texture_storage_multisample_2d_array */
     flextGL.TexStorage3DMultisampleOES = reinterpret_cast<void(APIENTRY*)(GLenum, GLsizei, GLenum, GLsizei, GLsizei, GLsizei, GLboolean)>(loader.load("glTexStorage3DMultisampleOES"));
 
+    /* GL_OES_texture_view */
+    flextGL.TextureViewOES = reinterpret_cast<void(APIENTRY*)(GLuint, GLenum, GLuint, GLenum, GLuint, GLuint, GLuint, GLuint)>(loader.load("glTextureViewOES"));
+
     /* GL_OVR_multiview */
     flextGL.FramebufferTextureMultiviewOVR = reinterpret_cast<void(APIENTRY*)(GLenum, GLenum, GLuint, GLint, GLint, GLsizei)>(loader.load("glFramebufferTextureMultiviewOVR"));
 }

src/MagnumExternal/OpenGL/GLES3/flextGLWindowsDesktop.h

@@ -1293,6 +1293,14 @@ typedef void (APIENTRY *GLDEBUGPROCKHR)(GLenum source,GLenum type,GLuint id,GLen
 #define GL_INT_IMAGE_CUBE_MAP_ARRAY_EXT 0x905F
 #define GL_UNSIGNED_INT_IMAGE_CUBE_MAP_ARRAY_EXT 0x906A
 
+/* GL_EXT_texture_view */
+
+#define GL_TEXTURE_VIEW_MIN_LEVEL_EXT 0x82DB
+#define GL_TEXTURE_VIEW_NUM_LEVELS_EXT 0x82DC
+#define GL_TEXTURE_VIEW_MIN_LAYER_EXT 0x82DD
+#define GL_TEXTURE_VIEW_NUM_LAYERS_EXT 0x82DE
+#define GL_TEXTURE_IMMUTABLE_LEVELS 0x82DF
+
 /* GL_EXT_primitive_bounding_box */
 
 #define GL_PRIMITIVE_BOUNDING_BOX_EXT 0x92BE
@@ -1445,6 +1453,14 @@ typedef void (APIENTRY *GLDEBUGPROCKHR)(GLenum source,GLenum type,GLuint id,GLen
 #define GL_INT_SAMPLER_2D_MULTISAMPLE_ARRAY_OES 0x910C
 #define GL_UNSIGNED_INT_SAMPLER_2D_MULTISAMPLE_ARRAY_OES 0x910D
 
+/* GL_OES_texture_view */
+
+#define GL_TEXTURE_VIEW_MIN_LEVEL_OES 0x82DB
+#define GL_TEXTURE_VIEW_NUM_LEVELS_OES 0x82DC
+#define GL_TEXTURE_VIEW_MIN_LAYER_OES 0x82DD
+#define GL_TEXTURE_VIEW_NUM_LAYERS_OES 0x82DE
+#define GL_TEXTURE_IMMUTABLE_LEVELS 0x82DF
+
 /* GL_APPLE_texture_format_BGRA8888 */
 
 #define GL_BGRA_EXT 0x80E1
@@ -2229,6 +2245,10 @@ struct FlextGL {
     void(APIENTRY *TexBufferEXT)(GLenum, GLenum, GLuint);
     void(APIENTRY *TexBufferRangeEXT)(GLenum, GLenum, GLuint, GLintptr, GLsizeiptr);
 
+    /* GL_EXT_texture_view */
+
+    void(APIENTRY *TextureViewEXT)(GLuint, GLenum, GLuint, GLenum, GLuint, GLuint, GLuint, GLuint);
+
     /* GL_KHR_blend_equation_advanced */
 
     void(APIENTRY *BlendBarrierKHR)(void);
@@ -2289,6 +2309,10 @@ struct FlextGL {
 
     void(APIENTRY *TexStorage3DMultisampleOES)(GLenum, GLsizei, GLenum, GLsizei, GLsizei, GLsizei, GLboolean);
 
+    /* GL_OES_texture_view */
+
+    void(APIENTRY *TextureViewOES)(GLuint, GLenum, GLuint, GLenum, GLuint, GLuint, GLuint, GLuint);
+
     /* GL_OVR_multiview */
 
     void(APIENTRY *FramebufferTextureMultiviewOVR)(GLenum, GLenum, GLuint, GLint, GLint, GLsizei);
@@ -2776,6 +2800,10 @@ extern FLEXTGL_EXPORT FlextGL flextGL;
 #define glTexBufferEXT flextGL.TexBufferEXT
 #define glTexBufferRangeEXT flextGL.TexBufferRangeEXT
 
+/* GL_EXT_texture_view */
+
+#define glTextureViewEXT flextGL.TextureViewEXT
+
 /* GL_KHR_blend_equation_advanced */
 
 #define glBlendBarrierKHR flextGL.BlendBarrierKHR
@@ -2836,6 +2864,10 @@ extern FLEXTGL_EXPORT FlextGL flextGL;
 
 #define glTexStorage3DMultisampleOES flextGL.TexStorage3DMultisampleOES
 
+/* GL_OES_texture_view */
+
+#define glTextureViewOES flextGL.TextureViewOES
+
 /* GL_OVR_multiview */
 
 #define glFramebufferTextureMultiviewOVR flextGL.FramebufferTextureMultiviewOVR