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Updated OpenGL ES support in Framebuffer.

pull/7/head
Vladimír Vondruš 14 years ago
parent
50a0e5558e
commit
fc0b405ccb
2 changed files with 179 additions and 66 deletions
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  1. 9
      src/Framebuffer.cpp
  2. 236
      src/Framebuffer.h

9
src/Framebuffer.cpp
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@ -20,7 +20,7 @@
namespace Magnum {
#ifndef MAGNUM_TARGET_GLES
#ifndef MAGNUM_TARGET_GLES2
void Framebuffer::mapDefaultForDraw(std::initializer_list<DefaultDrawAttachment> attachments) {
GLenum* _attachments = new GLenum[attachments.size()];
for(auto it = attachments.begin(); it != attachments.end(); ++it)
@ -30,6 +30,7 @@ void Framebuffer::mapDefaultForDraw(std::initializer_list<DefaultDrawAttachment>
glDrawBuffers(attachments.size(), _attachments);
delete[] _attachments;
}
#endif
void Framebuffer::mapForDraw(std::initializer_list<std::int8_t> colorAttachments) {
GLenum* attachments = new GLenum[colorAttachments.size()];
@ -37,10 +38,12 @@ void Framebuffer::mapForDraw(std::initializer_list<std::int8_t> colorAttachments
attachments[it-colorAttachments.begin()] = *it + GL_COLOR_ATTACHMENT0;
bind(Target::Draw);
/** @todo Re-enable when extension wrangler is available for ES2 */
#ifndef MAGNUM_TARGET_GLES2
glDrawBuffers(colorAttachments.size(), attachments);
#endif
delete[] attachments;
}
#endif
void Framebuffer::read(const Math::Vector2<GLint>& offset, const Math::Vector2<GLsizei>& size, AbstractImage::Components components, AbstractImage::ComponentType type, Image2D* image) {
char* data = new char[AbstractImage::pixelSize(components, type)*size.product()];
@ -48,7 +51,6 @@ void Framebuffer::read(const Math::Vector2<GLint>& offset, const Math::Vector2<G
image->setData(size, components, type, data);
}
#ifndef MAGNUM_TARGET_GLES
void Framebuffer::read(const Math::Vector2<GLint>& offset, const Math::Vector2<GLsizei>& size, AbstractImage::Components components, AbstractImage::ComponentType type, BufferedImage2D* image, Buffer::Usage usage) {
/* If the buffer doesn't have sufficient size, resize it */
/** @todo Explicitly reset also when buffer usage changes */
@ -58,6 +60,5 @@ void Framebuffer::read(const Math::Vector2<GLint>& offset, const Math::Vector2<G
image->buffer()->bind(Buffer::Target::PixelPack);
glReadPixels(offset.x(), offset.y(), size.x(), size.y(), static_cast<GLenum>(components), static_cast<GLenum>(type), nullptr);
}
#endif
}

236
src/Framebuffer.h
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@ -86,14 +86,15 @@ class MAGNUM_EXPORT Framebuffer {
/**
* Logical operation
* @see setLogicOperation()
* @requires_gl Logic operations on framebuffer are in desktop OpenGL only.
* @requires_gl Logical operations on framebuffer are not
* available in OpenGL ES.
*/
LogicOperation = GL_COLOR_LOGIC_OP,
/**
* Depth clamping. If enabled, ignores near and far clipping plane.
* @requires_gl
* @requires_gl32 Extension @extension{ARB,depth_clamp}
* @requires_gl Depth clamping is not available in OpenGL ES.
*/
DepthClamp = GL_DEPTH_CLAMP,
#endif
@ -184,7 +185,7 @@ class MAGNUM_EXPORT Framebuffer {
*
* Initial value is `1.0`.
* @see @fn_gl{ClearDepth}
* @requires_gl See setClearDepth(GLfloat), which is supported in OpenGL ES.
* @requires_gl See setClearDepth(GLfloat), which is available in OpenGL ES.
*/
inline static void setClearDepth(GLdouble depth) { glClearDepth(depth); }
#endif
@ -431,24 +432,19 @@ class MAGNUM_EXPORT Framebuffer {
enum class BlendEquation: GLenum {
Add = GL_FUNC_ADD, /**< `source + destination` */
Subtract = GL_FUNC_SUBTRACT, /**< `source - destination` */
ReverseSubtract = GL_FUNC_REVERSE_SUBTRACT /**< `destination - source` */
#ifndef MAGNUM_TARGET_GLES
/** @todo Enable for ES3 when the headers are available */
,
ReverseSubtract = GL_FUNC_REVERSE_SUBTRACT, /**< `destination - source` */
/**
* `min(source, destination)`
* @requires_gles30 Extension @es_extension{EXT,blend_minmax}
* @requires_gles30 %Extension @es_extension2{EXT,blend_minmax,blend_minmax}
*/
Min = GL_MIN,
/**
* `max(source, destination)`
* @requires_gles30 Extension @es_extension{EXT,blend_minmax}
* @requires_gles30 %Extension @es_extension2{EXT,blend_minmax,blend_minmax}
*/
Max = GL_MAX
#endif
};
/**
@ -499,8 +495,9 @@ class MAGNUM_EXPORT Framebuffer {
* Second source color (@f$ RGB = (R_{s1}, G_{s1}, B_{s1}); A = A_{s1} @f$)
*
* @see AbstractShaderProgram::bindFragmentDataLocationIndexed()
* @requires_gl
* @requires_gl33 Extension @extension{ARB,blend_func_extended}
* @requires_gl Multiple blending inputs are not available in
* OpenGL ES.
*/
SecondSourceColor = GL_SRC1_COLOR,
#endif
@ -515,8 +512,9 @@ class MAGNUM_EXPORT Framebuffer {
* One minus second source color (@f$ RGB = (1.0 - R_{s1}, 1.0 - G_{s1}, 1.0 - B_{s1}); A = 1.0 - A_{s1} @f$)
*
* @see AbstractShaderProgram::bindFragmentDataLocationIndexed()
* @requires_gl
* @requires_gl33 Extension @extension{ARB,blend_func_extended}
* @requires_gl Multiple blending inputs are not available in
* OpenGL ES.
*/
OneMinusSecondSourceColor = GL_ONE_MINUS_SRC1_COLOR,
#endif
@ -536,8 +534,9 @@ class MAGNUM_EXPORT Framebuffer {
* Second source alpha (@f$ RGB = (A_{s1}, A_{s1}, A_{s1}); A = A_{s1} @f$)
*
* @see AbstractShaderProgram::bindFragmentDataLocationIndexed()
* @requires_gl
* @requires_gl33 Extension @extension{ARB,blend_func_extended}
* @requires_gl Multiple blending inputs are not available in
* OpenGL ES.
*/
SecondSourceAlpha = GL_SRC1_ALPHA,
#endif
@ -552,8 +551,9 @@ class MAGNUM_EXPORT Framebuffer {
* One minus second source alpha (@f$ RGB = (1.0 - A_{s1}, 1.0 - A_{s1}, 1.0 - A_{s1}); A = 1.0 - A_{s1} @f$)
*
* @see AbstractShaderProgram::bindFragmentDataLocationIndexed()
* @requires_gl
* @requires_gl33 Extension @extension{ARB,blend_func_extended}
* @requires_gl Multiple blending inputs are not available in
* OpenGL ES.
*/
OneMinusSecondSourceAlpha = GL_ONE_MINUS_SRC1_ALPHA,
#endif
@ -650,7 +650,8 @@ class MAGNUM_EXPORT Framebuffer {
* @brief Logical operation
*
* @see setLogicOperation()
* @requires_gl
* @requires_gl Logical operations on framebuffer are not available in
* OpenGL ES.
*/
enum class LogicOperation: GLenum {
Clear = GL_CLEAR, /**< `0` */
@ -676,7 +677,8 @@ class MAGNUM_EXPORT Framebuffer {
*
* @attention You have to enable logical operation with setFeature() first.
* @see @fn_gl{LogicOp}
* @requires_gl Logic operations on framebuffer are in desktop OpenGL only.
* @requires_gl Logical operations on framebuffer are not available in
* OpenGL ES.
*/
inline static void setLogicOperation(LogicOperation operation) {
glLogicOp(static_cast<GLenum>(operation));
@ -694,60 +696,157 @@ class MAGNUM_EXPORT Framebuffer {
* @requires_gl30 Extension @extension{EXT,framebuffer_object}
*/
enum class Target: GLenum {
#ifndef MAGNUM_TARGET_GLES
/**
* For reading only.
* @requires_gl
* @requires_gl30 Extension @extension{EXT,framebuffer_blit}
* @requires_gles30 %Extension @es_extension{APPLE,framebuffer_multisample}
* or @es_extension{ANGLE,framebuffer_blit}
*/
Read = GL_READ_FRAMEBUFFER,
/**
* For drawing only.
* @requires_gl
* @requires_gl30 Extension @extension{EXT,framebuffer_blit}
* @requires_gles30 %Extension @es_extension{APPLE,framebuffer_multisample}
* or @es_extension{ANGLE,framebuffer_blit}
*/
Draw = GL_DRAW_FRAMEBUFFER,
#endif
ReadDraw = GL_FRAMEBUFFER /**< For both reading and drawing. */
};
#ifndef MAGNUM_TARGET_GLES
#ifndef MAGNUM_TARGET_GLES2
/**
* @brief Draw attachment for default framebuffer
*
* @see mapDefaultForDraw()
* @requires_gl
* @requires_gl30 Extension @extension{EXT,framebuffer_object}
* @requires_gles30 Draw attachments for default framebuffer are
* available only in OpenGL ES 3.0.
*/
enum class DefaultDrawAttachment: GLenum {
None = GL_NONE, /**< Don't use the output. */
BackLeft = GL_BACK_LEFT, /**< Write output to back left framebuffer. */
BackRight = GL_BACK_RIGHT, /**< Write output to back right framebuffer. */
FrontLeft = GL_FRONT_LEFT, /**< Write output to front left framebuffer. */
FrontRight = GL_FRONT_RIGHT /**< Write output to front right framebuffer. */
/** Don't use the output. */
None = GL_NONE,
#ifndef MAGNUM_TARGET_GLES
/**
* Write output to back left framebuffer.
* @requires_gl Stereo rendering is not available in OpenGL ES.
*/
BackLeft = GL_BACK_LEFT,
/**
* Write output to back right framebuffer.
* @requires_gl Stereo rendering is not available in OpenGL ES.
*/
BackRight = GL_BACK_RIGHT,
/**
* Write output to front left framebuffer.
* @requires_gl Stereo rendering is not available in OpenGL ES.
*/
FrontLeft = GL_FRONT_LEFT,
/**
* Write output to front right framebuffer.
* @requires_gl Stereo rendering is not available in OpenGL ES.
*/
FrontRight = GL_FRONT_RIGHT,
#endif
/**
* Write output to back framebuffer.
*
* On desktop OpenGL, this is equal to
* @ref Magnum::Framebuffer::DefaultDrawAttachment "DefaultDrawAttachment::BackLeft".
*/
#ifdef MAGNUM_TARGET_GLES
Back = GL_BACK,
#else
Back = GL_BACK_LEFT,
#endif
/**
* Write output to front framebuffer.
*
* On desktop OpenGL, this is equal to
* @ref Magnum::Framebuffer::DefaultDrawAttachment "DefaultDrawAttachment::FrontLeft".
*/
#ifdef MAGNUM_TARGET_GLES
Front = GL_FRONT
#else
Front = GL_FRONT_LEFT
#endif
};
#endif
/**
* @brief Read attachment for default framebuffer
*
* @see mapDefaultForRead()
* @requires_gl
* @requires_gl30 Extension @extension{EXT,framebuffer_object}
* @requires_gl30 %Extension @extension{EXT,framebuffer_object}
* @requires_gles30 %Extension @es_extension2{NV,read_buffer,GL_NV_read_buffer}
*/
enum class DefaultReadAttachment: GLenum {
FrontLeft = GL_FRONT_LEFT, /**< Read from front left framebuffer. */
FrontRight = GL_FRONT_RIGHT, /**< Read from front right framebuffer. */
BackLeft = GL_BACK_LEFT, /**< Read from back left framebuffer. */
BackRight = GL_BACK_RIGHT, /**< Read from back right framebuffer. */
Left = GL_LEFT, /**< Read from left framebuffers. */
Right = GL_RIGHT, /**< Read from right framebuffers. */
Front = GL_FRONT, /**< Read from front framebuffers. */
Back = GL_BACK, /**< Read from back framebuffers. */
FrontAndBack = GL_FRONT_AND_BACK /**< Read from front and back framebuffers. */
#ifndef MAGNUM_TARGET_GLES
/**
* Read from back left framebuffer.
* @requires_gl Stereo rendering is not available in OpenGL ES.
*/
BackLeft = GL_BACK_LEFT,
/**
* Read from back right framebuffer.
* @requires_gl Stereo rendering is not available in OpenGL ES.
*/
BackRight = GL_BACK_RIGHT,
/**
* Read from front left framebuffer.
* @requires_gl Stereo rendering is not available in OpenGL ES.
*/
FrontLeft = GL_FRONT_LEFT,
/**
* Read from front right framebuffer.
* @requires_gl Stereo rendering is not available in OpenGL ES.
*/
FrontRight = GL_FRONT_RIGHT,
/**
* Read from left framebuffer.
* @requires_gl Stereo rendering is not available in OpenGL ES.
*/
Left = GL_LEFT,
/**
* Read from right framebuffer.
* @requires_gl Stereo rendering is not available in OpenGL ES.
*/
Right = GL_RIGHT,
#endif
/** Read from back framebuffer. */
Back = GL_BACK,
/**
* Read from front framebuffer.
* @requires_es_extension %Extension @es_extension2{NV,read_buffer,GL_NV_read_buffer}
*/
Front = GL_FRONT
#ifndef MAGNUM_TARGET_GLES
,
/**
* Read from front and back framebuffer.
* @requires_gl In OpenGL ES you must specify either
* @ref Magnum::Framebuffer::DefaultReadAttachment "DefaultReadAttachment::Front"
* or @ref Magnum::Framebuffer::DefaultReadAttachment "DefaultReadAttachment::Back".
*/
FrontAndBack = GL_FRONT_AND_BACK
#endif
};
#endif
/**
* @brief Constructor
@ -788,7 +887,7 @@ class MAGNUM_EXPORT Framebuffer {
glBindFramebuffer(static_cast<GLenum>(target), _id);
}
#ifndef MAGNUM_TARGET_GLES
#ifndef MAGNUM_TARGET_GLES2
/**
* @brief Map given attachments of default framebuffer for drawing
* @param attachments Default attachments. If any value is
@ -800,10 +899,12 @@ class MAGNUM_EXPORT Framebuffer {
* should have either renderbuffer or texture attached for writing to
* work properly.
* @see mapForDraw(), mapDefaultForRead(), bindDefault(), @fn_gl{DrawBuffers}
* @requires_gl
* @requires_gl30 Extension @extension{EXT,framebuffer_object}
* @requires_gles30 Draw attachments for default framebuffer are
* available only in OpenGL ES 3.0.
*/
static void mapDefaultForDraw(std::initializer_list<DefaultDrawAttachment> attachments);
#endif
/**
* @brief Map given color attachments of current framebuffer for drawing
@ -816,8 +917,8 @@ class MAGNUM_EXPORT Framebuffer {
* should have either renderbuffer or texture attached for writing to
* work properly.
* @see mapDefaultForDraw(), mapForRead(), bind(), @fn_gl{DrawBuffers}
* @requires_gl
* @requires_gl30 Extension @extension{EXT,framebuffer_object}
* @requires_gles30 %Extension @es_extension2{NV,draw_buffers,GL_NV_draw_buffers}
*/
void mapForDraw(std::initializer_list<std::int8_t> colorAttachments);
@ -828,8 +929,8 @@ class MAGNUM_EXPORT Framebuffer {
* Each used attachment should have either renderbuffer or texture
* attached to work properly.
* @see mapForRead(), mapDefaultForDraw(), bindDefault(), @fn_gl{ReadBuffer}
* @requires_gl
* @requires_gl30 Extension @extension{EXT,framebuffer_object}
* @requires_gles30 %Extension @es_extension2{NV,read_buffer,GL_NV_read_buffer}
*/
inline static void mapDefaultForRead(DefaultReadAttachment attachment) {
bindDefault(Target::Read);
@ -843,14 +944,13 @@ class MAGNUM_EXPORT Framebuffer {
* The color attachment should have either renderbuffer or texture
* attached for reading to work properly.
* @see mapDefaultForRead(), mapForDraw(), bind(), @fn_gl{ReadBuffer}
* @requires_gl
* @requires_gl30 Extension @extension{EXT,framebuffer_object}
* @requires_gles30 %Extension @es_extension2{NV,read_buffer,GL_NV_read_buffer}
*/
inline void mapForRead(std::uint8_t colorAttachment) {
bind(Target::Read);
glReadBuffer(GL_COLOR_ATTACHMENT0 + colorAttachment);
}
#endif
/*@}*/
@ -871,10 +971,12 @@ class MAGNUM_EXPORT Framebuffer {
Stencil = GL_STENCIL_ATTACHMENT /**< Stencil output only. */
#ifndef MAGNUM_TARGET_GLES
#ifndef MAGNUM_TARGET_GLES2
,
/**
* Both depth and stencil output.
* @requires_gles30 Combined depth and stencil attachment is not
* available in OpenGL ES 2.0.
*/
DepthStencil = GL_DEPTH_STENCIL_ATTACHMENT
#endif
@ -919,8 +1021,8 @@ class MAGNUM_EXPORT Framebuffer {
* @param mipLevel Mip level
*
* @see bind(), @fn_gl{FramebufferTexture}
* @requires_gl
* @requires_gl30 Extension @extension{EXT,framebuffer_object}
* @requires_gl Only 2D and 3D textures are available in OpenGL ES.
*/
inline void attachTexture1D(Target target, DepthStencilAttachment depthStencilAttachment, Texture1D* texture, GLint mipLevel) {
/** @todo Check for internal format compatibility */
@ -937,8 +1039,8 @@ class MAGNUM_EXPORT Framebuffer {
* @param mipLevel Mip level
*
* @see bind(), @fn_gl{FramebufferTexture}
* @requires_gl
* @requires_gl30 Extension @extension{EXT,framebuffer_object}
* @requires_gl Only 2D and 3D textures are available in OpenGL ES.
*/
inline void attachTexture1D(Target target, std::uint8_t colorAttachment, Texture1D* texture, GLint mipLevel) {
/** @todo Check for internal format compatibility */
@ -1018,7 +1120,6 @@ class MAGNUM_EXPORT Framebuffer {
glFramebufferTexture2D(static_cast<GLenum>(target), GL_COLOR_ATTACHMENT0 + colorAttachment, static_cast<GLenum>(coordinate), texture->id(), mipLevel);
}
#ifndef MAGNUM_TARGET_GLES
/**
* @brief Attach 3D texture to given framebuffer depth/stencil attachment
* @param target %Target
@ -1028,14 +1129,22 @@ class MAGNUM_EXPORT Framebuffer {
* @param layer Layer of 2D image within a 3D texture
*
* @see bind(), @fn_gl{FramebufferTexture}
* @requires_gl
* @requires_gl30 Extension @extension{EXT,framebuffer_object}
* @requires_es_extension %Extension @es_extension{OES,texture_3D}
*/
inline void attachTexture3D(Target target, DepthStencilAttachment depthStencilAttachment, Texture3D* texture, GLint mipLevel, GLint layer) {
/** @todo Check for internal format compatibility */
/** @todo Check for texture target compatibility */
bind(target);
/** @todo Get some extension wrangler for glFramebufferTexture3D() (extension only) */
#ifndef MAGNUM_TARGET_GLES
glFramebufferTexture3D(static_cast<GLenum>(target), static_cast<GLenum>(depthStencilAttachment), static_cast<GLenum>(texture->target()), texture->id(), mipLevel, layer);
#else
static_cast<void>(depthStencilAttachment);
static_cast<void>(texture);
static_cast<void>(mipLevel);
static_cast<void>(layer);
#endif
}
/**
@ -1047,30 +1156,36 @@ class MAGNUM_EXPORT Framebuffer {
* @param layer Layer of 2D image within a 3D texture.
*
* @see bind(), @fn_gl{FramebufferTexture}
* @requires_gl
* @requires_gl30 Extension @extension{EXT,framebuffer_object}
* @requires_es_extension %Extension @es_extension{OES,texture_3D}
*/
inline void attachTexture3D(Target target, std::uint8_t colorAttachment, Texture3D* texture, GLint mipLevel, GLint layer) {
/** @todo Check for internal format compatibility */
/** @todo Check for texture target compatibility */
bind(target);
/** @todo Get some extension wrangler for glFramebufferTexture3D() (extension only) */
#ifndef MAGNUM_TARGET_GLES
glFramebufferTexture3D(static_cast<GLenum>(target), GL_COLOR_ATTACHMENT0 + colorAttachment, static_cast<GLenum>(texture->target()), texture->id(), mipLevel, layer);
#else
static_cast<void>(colorAttachment);
static_cast<void>(texture);
static_cast<void>(mipLevel);
static_cast<void>(layer);
#endif
}
#endif
/*@}*/
/** @{ @name Framebuffer blitting and reading */
#ifndef MAGNUM_TARGET_GLES
/**
* @brief Output mask for blitting
*
* Specifies which data are copied when performing blit operation
* using blit().
* @see BlitMask
* @requires_gl
* @requires_gl30 Extension @extension{EXT,framebuffer_object}
* @requires_gles30 %Extension @es_extension{ANGLE,framebuffer_blit}
*/
enum class Blit: GLbitfield {
Color = GL_COLOR_BUFFER_BIT, /**< Color */
@ -1080,8 +1195,8 @@ class MAGNUM_EXPORT Framebuffer {
/**
* @brief Output mask for blitting
* @requires_gl
* @requires_gl30 Extension @extension{EXT,framebuffer_object}
* @requires_gles30 %Extension @es_extension{ANGLE,framebuffer_blit}
*/
typedef Corrade::Containers::EnumSet<Blit, GLbitfield,
GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT|GL_STENCIL_BUFFER_BIT> BlitMask;
@ -1102,8 +1217,8 @@ class MAGNUM_EXPORT Framebuffer {
* and drawing. If multiple attachments are specified in mapForDraw()
* / mapDefaultForDraw(), the data are written to each of them.
* @see @fn_gl{BlitFramebuffer}
* @requires_gl
* @requires_gl30 Extension @extension{EXT,framebuffer_blit}
* @requires_gles30 %Extension @es_extension{ANGLE,framebuffer_blit}
*/
inline static void blit(const Math::Vector2<GLint>& bottomLeft, const Math::Vector2<GLint>& topRight, const Math::Vector2<GLint>& destinationBottomLeft, const Math::Vector2<GLint>& destinationTopRight, BlitMask blitMask, AbstractTexture::Filter filter) {
glBlitFramebuffer(bottomLeft.x(), bottomLeft.y(), topRight.x(), topRight.y(), destinationBottomLeft.x(), destinationBottomLeft.y(), destinationTopRight.x(), destinationTopRight.y(), static_cast<GLbitfield>(blitMask), static_cast<GLenum>(filter));
@ -1123,13 +1238,12 @@ class MAGNUM_EXPORT Framebuffer {
* AbstractTexture::Filter::NearestNeighbor filtering is used by
* default.
* @see @fn_gl{BlitFramebuffer}
* @requires_gl
* @requires_gl30 Extension @extension{EXT,framebuffer_blit}
* @requires_gles30 %Extension @es_extension{ANGLE,framebuffer_blit}
*/
inline static void blit(const Math::Vector2<GLint>& bottomLeft, const Math::Vector2<GLint>& topRight, BlitMask blitMask) {
glBlitFramebuffer(bottomLeft.x(), bottomLeft.y(), topRight.x(), topRight.y(), bottomLeft.x(), bottomLeft.y(), topRight.x(), topRight.y(), static_cast<GLbitfield>(blitMask), static_cast<GLenum>(AbstractTexture::Filter::NearestNeighbor));
}
#endif
/**
* @brief Read block of pixels from framebuffer to image
@ -1144,7 +1258,6 @@ class MAGNUM_EXPORT Framebuffer {
*/
static void read(const Math::Vector2<GLint>& offset, const Math::Vector2<GLsizei>& size, AbstractImage::Components components, AbstractImage::ComponentType type, Image2D* image);
#ifndef MAGNUM_TARGET_GLES
/**
* @brief Read block of pixels from framebuffer to buffered image
* @param offset Offset in the framebuffer
@ -1155,11 +1268,10 @@ class MAGNUM_EXPORT Framebuffer {
* @param usage %Buffer usage
*
* @see Buffer::bind(Target), @fn_gl{ReadPixels}
* @requires_gl
* @requires_gl30 Extension @extension{EXT,framebuffer_object}
* @requires_gles30 Pixel buffer objects are not available in OpenGL ES 2.0.
*/
static void read(const Math::Vector2<GLint>& offset, const Math::Vector2<GLsizei>& size, AbstractImage::Components components, AbstractImage::ComponentType type, BufferedImage2D* image, Buffer::Usage usage);
#endif
/*@}*/

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