Merge branch 'master' into compatibility

src/Buffer.cpp

@@ -78,6 +78,14 @@ void Buffer::initializeContextBasedFunctionality(Context* context) {
     #endif
 }
 
+Buffer::Buffer(Buffer::Target targetHint): _targetHint(targetHint)
+    #ifdef CORRADE_TARGET_NACL
+    , _mappedBuffer(nullptr)
+    #endif
+{
+    glGenBuffers(1, &_id);
+}
+
 Buffer::~Buffer() {
     GLuint* bindings = Context::current()->state()->buffer->bindings;
 
@@ -127,6 +135,31 @@ Int Buffer::size() {
     return size;
 }
 
+#ifdef MAGNUM_TARGET_GLES2
+void* Buffer::mapSub(const GLintptr offset, const GLsizeiptr length, const MapAccess access) {
+    /** @todo Enable also in Emscripten (?) when extension wrangler is available */
+    #ifdef CORRADE_TARGET_NACL
+    CORRADE_ASSERT(!_mappedBuffer, "Buffer::mapSub(): the buffer is already mapped", nullptr);
+    return _mappedBuffer = glMapBufferSubDataCHROMIUM(static_cast<GLenum>(bindInternal(_targetHint)), offset, length, GLenum(access));
+    #else
+    CORRADE_INTERNAL_ASSERT(false);
+    static_cast<void>(offset);
+    static_cast<void>(length);
+    static_cast<void>(access);
+    #endif
+}
+
+void Buffer::unmapSub() {
+    #ifdef CORRADE_TARGET_NACL
+    CORRADE_ASSERT(_mappedBuffer, "Buffer::unmapSub(): the buffer is not mapped", );
+    glUnmapBufferSubDataCHROMIUM(_mappedBuffer);
+    _mappedBuffer = nullptr;
+    #else
+    CORRADE_INTERNAL_ASSERT(false);
+    #endif
+}
+#endif
+
 #ifndef MAGNUM_TARGET_GLES2
 void Buffer::copyImplementationDefault(Buffer* read, Buffer* write, GLintptr readOffset, GLintptr writeOffset, GLsizeiptr size) {
     glCopyBufferSubData(static_cast<GLenum>(read->bindInternal(Target::CopyRead)), static_cast<GLenum>(write->bindInternal(Target::CopyWrite)), readOffset, writeOffset, size);

src/Buffer.h

@@ -324,9 +324,10 @@ class MAGNUM_EXPORT Buffer {
          *
          * @deprecated Prefer to use @ref Magnum::Buffer::map(GLintptr, GLsizeiptr, MapFlags) "map(GLintptr, GLsizeiptr, MapFlags)"
          *      instead, as it has more complete set of features.
-         * @see map(MapAccess)
-         * @requires_es_extension %Extension @es_extension{OES,mapbuffer} in
-         *      OpenGL ES 2.0, use @ref Magnum::Buffer::map(GLintptr, GLsizeiptr, MapFlags) "map(GLintptr, GLsizeiptr, MapFlags)"
+         * @see map(MapAccess), mapSub()
+         * @requires_es_extension %Extension @es_extension{OES,mapbuffer} or
+         *      @es_extension{CHROMIUM,map_sub} in OpenGL ES 2.0, use
+         *      @ref Magnum::Buffer::map(GLintptr, GLsizeiptr, MapFlags) "map(GLintptr, GLsizeiptr, MapFlags)"
          *      in OpenGL ES 3.0 instead.
          */
         enum class MapAccess: GLenum {
@@ -471,9 +472,7 @@ class MAGNUM_EXPORT Buffer {
          * Generates new OpenGL buffer.
          * @see @fn_gl{GenBuffers}
          */
-        explicit Buffer(Target targetHint = Target::Array): _targetHint(targetHint) {
-            glGenBuffers(1, &_id);
-        }
+        explicit Buffer(Target targetHint = Target::Array);
 
         /**
          * @brief Destructor
@@ -728,6 +727,27 @@ class MAGNUM_EXPORT Buffer {
         }
         #endif
 
+        #if defined(MAGNUM_TARGET_GLES2) || defined(DOXYGEN_GENERATING_OUTPUT)
+        /**
+         * @brief Map portion of buffer to client memory
+         * @param offset    Offset into the buffer
+         * @param length    Length of the mapped memory
+         * @param access    Access
+         * @return Pointer to buffer data
+         *
+         * If the buffer is not already bound somewhere, it is bound to hinted
+         * target before the operation.
+         * @deprecated Prefer to use @ref Magnum::Buffer::map(GLintptr, GLsizeiptr, MapFlags) "map(GLintptr, GLsizeiptr, MapFlags)"
+         *      instead, as it has more complete set of features.
+         * @see unmapSub(), setTargetHint(), @fn_gl_extension{MapBufferSubData,CHROMIUM,map_sub}
+         * @requires_gles20 Not available in ES 3.0 or desktop OpenGL. Use
+         *      @ref Magnum::Buffer::map(GLintptr, GLsizeiptr, MapFlags) "map(GLintptr, GLsizeiptr, MapFlags)"
+         *      instead.
+         * @requires_es_extension %Extension @es_extension{CHROMIUM,map_sub}
+         */
+        void* mapSub(GLintptr offset, GLsizeiptr length, MapAccess access);
+        #endif
+
         /**
          * @brief Map buffer to client memory
          * @param offset    Offset into the buffer
@@ -789,6 +809,21 @@ class MAGNUM_EXPORT Buffer {
             return (this->*unmapImplementation)();
         }
 
+        #if defined(MAGNUM_TARGET_GLES2) || defined(DOXYGEN_GENERATING_OUTPUT)
+        /**
+         * @brief Unmap portion of buffer
+         *
+         * Unmaps portion of buffer previously mapped with mapSub(),
+         * invalidating the pointer returned by the function.
+         * @see @fn_gl_extension{UnmapBufferSubData,CHROMIUM,map_sub}
+         * @requires_gles20 Not available in ES 3.0 or desktop OpenGL. Use
+         *      @ref Magnum::Buffer::map(GLintptr, GLsizeiptr, MapFlags) "map(GLintptr, GLsizeiptr, MapFlags)"
+         *      instead.
+         * @requires_es_extension %Extension @es_extension{CHROMIUM,map_sub}
+         */
+        void unmapSub();
+        #endif
+
     private:
         static void MAGNUM_LOCAL initializeContextBasedFunctionality(Context* context);
 
@@ -878,6 +913,9 @@ class MAGNUM_EXPORT Buffer {
 
         GLuint _id;
         Target _targetHint;
+        #ifdef CORRADE_TARGET_NACL
+        void* _mappedBuffer;
+        #endif
 };
 
 CORRADE_ENUMSET_OPERATORS(Buffer::MapFlags)

src/Context.cpp

@@ -199,6 +199,7 @@ const std::vector<Extension>& Extension::extensions(Version version) {
     #else
     static const std::vector<Extension> extensions{
         _extension(GL,APPLE,texture_format_BGRA8888),
+        _extension(GL,CHROMIUM,map_sub),
         _extension(GL,EXT,texture_filter_anisotropic),
         _extension(GL,EXT,texture_format_BGRA8888),
         _extension(GL,EXT,read_format_bgra),

src/Extensions.h

@@ -193,6 +193,8 @@ namespace GL {
         _extension(GL,APPLE,texture_format_BGRA8888, GLES200,   None) // #79
     } namespace ARM {
         _extension(GL,ARM,rgba8,                    GLES200, GLES300) // #82
+    } namespace CHROMIUM {
+        _extension(GL,CHROMIUM,map_sub,             GLES200,    None)
     } namespace EXT {
         _extension(GL,EXT,texture_filter_anisotropic, GLES200,  None) // #41
         _extension(GL,EXT,texture_type_2_10_10_10_REV, GLES200, GLES300) // #42

src/OpenGL.h

@@ -40,6 +40,10 @@
    to NaCl's gl2ext.h we are including our own to prevent undeclared symbol
    errors with some recent extensions. */
 #elif defined(CORRADE_TARGET_NACL)
+
+/* Enable function prototypes (the supported ones shouldn't fail at link time) */
+#define GL_GLEXT_PROTOTYPES
+
 #include <GLES2/gl2.h>
 #include <GLES2/gl2ext.h>
 #undef __gl2ext_h_

src/Test/BufferGLTest.cpp

@@ -38,6 +38,9 @@ class BufferGLTest: public AbstractOpenGLTester {
         void construct();
         void data();
         void map();
+        #ifdef MAGNUM_TARGET_GLES2
+        void mapSub();
+        #endif
         void mapRange();
         void mapRangeExplicitFlush();
         #ifndef MAGNUM_TARGET_GLES2
@@ -52,6 +55,9 @@ BufferGLTest::BufferGLTest() {
     addTests({&BufferGLTest::construct,
               &BufferGLTest::data,
               &BufferGLTest::map,
+              #ifdef MAGNUM_TARGET_GLES2
+              &BufferGLTest::mapSub,
+              #endif
               &BufferGLTest::mapRange,
               &BufferGLTest::mapRangeExplicitFlush,
               #ifndef MAGNUM_TARGET_GLES2
@@ -147,6 +153,29 @@ void BufferGLTest::map() {
 }
 #endif
 
+#ifdef MAGNUM_TARGET_GLES2
+void BufferGLTest::mapSub() {
+    if(!Context::current()->isExtensionSupported<Extensions::GL::CHROMIUM::map_sub>())
+        CORRADE_SKIP(Extensions::GL::CHROMIUM::map_sub::string() + std::string(" is not supported"));
+
+    Buffer buffer;
+
+    constexpr char data[] = {2, 7, 5, 13, 25};
+    buffer.setData(data, Buffer::Usage::StaticDraw);
+
+    char* contents = reinterpret_cast<char*>(buffer.mapSub(1, 4, Buffer::MapAccess::WriteOnly));
+    MAGNUM_VERIFY_NO_ERROR();
+
+    CORRADE_VERIFY(contents);
+    contents[3] = 107;
+
+    buffer.unmapSub();
+    MAGNUM_VERIFY_NO_ERROR();
+
+    /** @todo How to verify the contents in ES? */
+}
+#endif
+
 void BufferGLTest::mapRange() {
     #ifndef MAGNUM_TARGET_GLES2
     if(!Context::current()->isExtensionSupported<Extensions::GL::ARB::map_buffer_range>())

src/Text/TextRenderer.cpp

@@ -205,14 +205,55 @@ template<UnsignedInt dimensions> std::tuple<Mesh, Rectangle> TextRenderer<dimens
     return std::move(r);
 }
 
+#ifdef MAGNUM_TARGET_GLES2
+AbstractTextRenderer::BufferMapImplementation AbstractTextRenderer::bufferMapImplementation = &AbstractTextRenderer::bufferMapImplementationFull;
+AbstractTextRenderer::BufferUnmapImplementation AbstractTextRenderer::bufferUnmapImplementation = &AbstractTextRenderer::bufferUnmapImplementationDefault;
+
+void* AbstractTextRenderer::bufferMapImplementationFull(Buffer& buffer, GLsizeiptr) {
+    return buffer.map(Buffer::MapAccess::WriteOnly);
+}
+
+void* AbstractTextRenderer::bufferMapImplementationSub(Buffer& buffer, GLsizeiptr length) {
+    return buffer.mapSub(0, length, Buffer::MapAccess::WriteOnly);
+}
+
+void AbstractTextRenderer::bufferUnmapImplementationSub(Buffer& buffer) {
+    buffer.unmap();
+}
+#endif
+
+#ifndef MAGNUM_TARGET_GLES2
+inline void* AbstractTextRenderer::bufferMapImplementation(Buffer& buffer, GLsizeiptr length)
+#else
+void* AbstractTextRenderer::bufferMapImplementationRange(Buffer& buffer, GLsizeiptr length)
+#endif
+{
+    return buffer.map(0, length, Buffer::MapFlag::InvalidateBuffer|Buffer::MapFlag::Write);
+}
+
+#ifndef MAGNUM_TARGET_GLES2
+inline void AbstractTextRenderer::bufferUnmapImplementation(Buffer& buffer)
+#else
+void AbstractTextRenderer::bufferUnmapImplementationDefault(Buffer& buffer)
+#endif
+{
+    buffer.unmap();
+}
+
 AbstractTextRenderer::AbstractTextRenderer(AbstractFont* const font, const GlyphCache* const cache, Float size): _vertexBuffer(Buffer::Target::Array), _indexBuffer(Buffer::Target::ElementArray), font(font), cache(cache), size(size), _capacity(0) {
     #ifndef MAGNUM_TARGET_GLES
     MAGNUM_ASSERT_EXTENSION_SUPPORTED(Extensions::GL::ARB::map_buffer_range);
     #elif defined(MAGNUM_TARGET_GLES2)
-    if(!Context::current()->isExtensionSupported<Extensions::GL::EXT::map_buffer_range>()) {
+    if(Context::current()->isExtensionSupported<Extensions::GL::EXT::map_buffer_range>()) {
+        bufferMapImplementation = &AbstractTextRenderer::bufferMapImplementationRange;
+    } else if(Context::current()->isExtensionSupported<Extensions::GL::CHROMIUM::map_sub>()) {
+        bufferMapImplementation = &AbstractTextRenderer::bufferMapImplementationSub;
+        bufferUnmapImplementation = &AbstractTextRenderer::bufferUnmapImplementationSub;
+    } else {
         MAGNUM_ASSERT_EXTENSION_SUPPORTED(Extensions::GL::OES::mapbuffer);
-        Warning() << "Text::TextRenderer:" << Extensions::GL::EXT::map_buffer_range::string()
-                  << "is not supported, using less efficient" << Extensions::GL::OES::mapbuffer::string()
+        Warning() << "Text::TextRenderer: neither" << Extensions::GL::EXT::map_buffer_range::string()
+                  << "nor" << Extensions::GL::CHROMIUM::map_sub::string()
+                  << "is supported, using inefficient" << Extensions::GL::OES::mapbuffer::string()
                   << "instead";
     }
     #endif
@@ -258,15 +299,8 @@ void AbstractTextRenderer::reserve(const uint32_t glyphCount, const Buffer::Usag
         ->setIndexBuffer(&_indexBuffer, 0, indexType, 0, vertexCount);
 
     /* Map buffer for filling */
-    void* indices;
-    #ifdef MAGNUM_TARGET_GLES2
-    if(Context::current()->isExtensionSupported<Extensions::GL::EXT::map_buffer_range>())
-    #endif
-        CORRADE_INTERNAL_ASSERT_OUTPUT(indices = _indexBuffer.map(0, indicesSize,
-            Buffer::MapFlag::InvalidateBuffer|Buffer::MapFlag::Write));
-    #ifdef MAGNUM_TARGET_GLES2
-    else CORRADE_INTERNAL_ASSERT_OUTPUT(indices = _indexBuffer.map(Buffer::MapAccess::WriteOnly));
-    #endif
+    void* const indices = bufferMapImplementation(_indexBuffer, indicesSize);
+    CORRADE_INTERNAL_ASSERT(indices);
 
     /* Prefill index buffer */
     if(vertexCount < 255)
@@ -275,7 +309,7 @@ void AbstractTextRenderer::reserve(const uint32_t glyphCount, const Buffer::Usag
         createIndices<UnsignedShort>(indices, glyphCount);
     else
         createIndices<UnsignedInt>(indices, glyphCount);
-    CORRADE_INTERNAL_ASSERT_OUTPUT(_indexBuffer.unmap());
+    bufferUnmapImplementation(_indexBuffer);
 }
 
 void AbstractTextRenderer::render(const std::string& text) {
@@ -288,17 +322,9 @@ void AbstractTextRenderer::render(const std::string& text) {
     _rectangle = {};
 
     /* Map buffer for rendering */
-    Vertex* vertices;
-    #ifdef MAGNUM_TARGET_GLES2
-    if(Context::current()->isExtensionSupported<Extensions::GL::EXT::map_buffer_range>())
-    #endif
-        CORRADE_INTERNAL_ASSERT_OUTPUT(vertices = static_cast<Vertex*>(_vertexBuffer.map(0,
-            layouter->glyphCount()*4*sizeof(Vertex),
-            Buffer::MapFlag::InvalidateBuffer|Buffer::MapFlag::Write)));
-    #ifdef MAGNUM_TARGET_GLES2
-    else CORRADE_INTERNAL_ASSERT_OUTPUT(vertices =
-        static_cast<Vertex*>(_vertexBuffer.map(Buffer::MapAccess::WriteOnly)));
-    #endif
+    Vertex* const vertices = static_cast<Vertex*>(bufferMapImplementation(_vertexBuffer,
+        layouter->glyphCount()*4*sizeof(Vertex)));
+    CORRADE_INTERNAL_ASSERT_OUTPUT(vertices);
 
     /* Render all glyphs */
     Vector2 cursorPosition;
@@ -325,7 +351,7 @@ void AbstractTextRenderer::render(const std::string& text) {
         /* Advance cursor position to next character */
         cursorPosition += advance;
     }
-    CORRADE_INTERNAL_ASSERT_OUTPUT(_vertexBuffer.unmap());
+    bufferUnmapImplementation(_vertexBuffer);
 
     /* Update index count */
     _mesh.setIndexCount(layouter->glyphCount()*6);

src/Text/TextRenderer.h

@@ -134,6 +134,25 @@ class MAGNUM_TEXT_EXPORT AbstractTextRenderer {
         Float size;
         UnsignedInt _capacity;
         Rectangle _rectangle;
+
+        #ifdef MAGNUM_TARGET_GLES2
+        typedef void*(*BufferMapImplementation)(Buffer&, GLsizeiptr);
+        static MAGNUM_TEXT_LOCAL void* bufferMapImplementationFull(Buffer& buffer, GLsizeiptr length);
+        static MAGNUM_TEXT_LOCAL void* bufferMapImplementationSub(Buffer& buffer, GLsizeiptr length);
+        static MAGNUM_TEXT_LOCAL void* bufferMapImplementationRange(Buffer& buffer, GLsizeiptr length);
+        static BufferMapImplementation bufferMapImplementation;
+        #else
+        static void* bufferMapImplementation(Buffer& buffer, GLsizeiptr length);
+        #endif
+
+        #ifdef MAGNUM_TARGET_GLES2
+        typedef void(*BufferUnmapImplementation)(Buffer&);
+        static MAGNUM_TEXT_LOCAL void bufferUnmapImplementationDefault(Buffer& buffer);
+        static MAGNUM_TEXT_LOCAL void bufferUnmapImplementationSub(Buffer& buffer);
+        static MAGNUM_TEXT_LOCAL BufferUnmapImplementation bufferUnmapImplementation;
+        #else
+        static void bufferUnmapImplementation(Buffer& buffer);
+        #endif
 };
 
 /**
@@ -198,9 +217,9 @@ renderer.mesh().draw();
 @section TextRenderer-extensions Required OpenGL functionality
 
 Mutable text rendering requires @extension{ARB,map_buffer_range} on desktop
-OpenGL (also part of OpenGL ES 3.0). If @es_extension{EXT,map_buffer_range} is
-not available in ES 2.0, at least @es_extension{OES,mapbuffer} must be
-supported for asynchronous buffer updates.
+OpenGL (also part of OpenGL ES 3.0). If neither @es_extension{EXT,map_buffer_range}
+nor @es_extension{CHROMIUM,map_sub} is not available in ES 2.0, at least
+@es_extension{OES,mapbuffer} must be supported for asynchronous buffer updates.
 
 @see TextRenderer2D, TextRenderer3D, Font, Shaders::AbstractVectorShader
 */