Ability to set texture subdata from image with one less dimensions.

It is now possible to call Texture2D::setSubData() with 1D image and
Texture3D::setSubData() with 2D image.

src/AbstractTexture.h

@@ -601,6 +601,10 @@ template<> struct AbstractTexture::DataHelper<2> {
     template<class Image> inline static void setSub(GLenum target, GLint mipLevel, const Math::Vector<2, GLint>& offset, Image* image, const Math::Vector<2, GLsizei>& = Math::Vector<Image::Dimensions, GLsizei>()) {
         glTexSubImage2D(target, mipLevel, offset[0], offset[1], image->dimensions()[0], image->dimensions()[1], static_cast<GLenum>(image->components()), static_cast<GLenum>(image->type()), image->data());
     }
+
+    template<class Image> inline static void setSub(GLenum target, GLint mipLevel, const Math::Vector<2, GLint>& offset, Image* image, const Math::Vector<1, GLsizei>& = Math::Vector<Image::Dimensions, GLsizei>()) {
+        glTexSubImage2D(target, mipLevel, offset[0], offset[1], image->dimensions()[0], 1, static_cast<GLenum>(image->components()), static_cast<GLenum>(image->type()), image->data());
+    }
 };
 template<> struct AbstractTexture::DataHelper<3> {
     enum class Target: GLenum {
@@ -619,6 +623,10 @@ template<> struct AbstractTexture::DataHelper<3> {
     template<class Image> inline static void setSub(GLenum target, GLint mipLevel, const Math::Vector<3, GLint>& offset, Image* image, const Math::Vector<3, GLsizei>& = Math::Vector<Image::Dimensions, GLsizei>()) {
         glTexSubImage3D(target, mipLevel, offset[0], offset[1], offset[2], image->dimensions()[0], image->dimensions()[1], image->dimensions()[2], static_cast<GLenum>(image->components()), static_cast<GLenum>(image->type()), image->data());
     }
+
+    template<class Image> inline static void setSub(GLenum target, GLint mipLevel, const Math::Vector<3, GLint>& offset, Image* image, const Math::Vector<2, GLsizei>& = Math::Vector<Image::Dimensions, GLsizei>()) {
+        glTexSubImage3D(target, mipLevel, offset[0], offset[1], offset[2], image->dimensions()[0], image->dimensions()[1], 1, static_cast<GLenum>(image->components()), static_cast<GLenum>(image->type()), image->data());
+    }
 };
 #endif
 

src/Texture.h

@@ -145,10 +145,16 @@ template<size_t textureDimensions> class Texture: public AbstractTexture {
          * @param mipLevel          Mip level
          * @param offset            Offset where to put data in the texture
          * @param image             Image, BufferedImage or for example
-         *      Trade::ImageData of the same dimension count
+         *      Trade::ImageData
          *
          * Sets texture subdata from given image. The image is not deleted
-         * afterwards.
+         * afterwards. The image can have either the same dimension count or
+         * have one dimension less, but at least one dimension.
+         *
+         * If the image has one dimension less than the texture, the image is
+         * taken as if it had the last dimension equal to 1. It can be used
+         * for e.g. updating 3D texture with multiple 2D images or for filling
+         * 1D texture array (which is two-dimensional) with 1D images.
          */
         template<class Image> inline void setSubData(GLint mipLevel, const Math::Vector<Dimensions, GLint>& offset, Image* image) {
             bind();