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author | Konstantin Käfer <mail@kkaefer.com> | 2016-11-04 17:39:14 +0100 |
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committer | Konstantin Käfer <mail@kkaefer.com> | 2016-11-04 21:24:05 +0100 |
commit | c90a55959980f9ef9678a45b9c9ded906d637b34 (patch) | |
tree | 7bf7a9041c269934b3bb25f2b84934f29d330d8b /src/mbgl/gl | |
parent | eed16cb1bb14c5de68e71ba7960cbe264cc08760 (diff) | |
download | qtlocation-mapboxgl-c90a55959980f9ef9678a45b9c9ded906d637b34.tar.gz |
[core] move framebuffer reading to gl::Context
Diffstat (limited to 'src/mbgl/gl')
-rw-r--r-- | src/mbgl/gl/context.cpp | 26 | ||||
-rw-r--r-- | src/mbgl/gl/context.hpp | 10 | ||||
-rw-r--r-- | src/mbgl/gl/types.hpp | 4 |
3 files changed, 40 insertions, 0 deletions
diff --git a/src/mbgl/gl/context.cpp b/src/mbgl/gl/context.cpp index 1cd546f407..811a038caf 100644 --- a/src/mbgl/gl/context.cpp +++ b/src/mbgl/gl/context.cpp @@ -92,6 +92,32 @@ UniqueRenderbuffer Context::createRenderbuffer(const RenderbufferType type, cons return renderbuffer; } +std::unique_ptr<uint8_t[]> Context::readFramebuffer(const Size size, const TextureFormat format, const bool flip) { + const size_t stride = size.width * (format == TextureFormat::RGBA ? 4 : 1); + auto data = std::make_unique<uint8_t[]>(stride * size.height); + +#if not MBGL_USE_GLES2 + // When reading data from the framebuffer, make sure that we are storing the values + // tightly packed into the buffer to avoid buffer overruns. + pixelStorePack = { 1 }; +#endif // MBGL_USE_GLES2 + + MBGL_CHECK_ERROR(glReadPixels(0, 0, size.width, size.height, static_cast<GLenum>(format), + GL_UNSIGNED_BYTE, data.get())); + + if (flip) { + auto tmp = std::make_unique<uint8_t[]>(stride); + uint8_t* rgba = data.get(); + for (int i = 0, j = size.height - 1; i < j; i++, j--) { + std::memcpy(tmp.get(), rgba + i * stride, stride); + std::memcpy(rgba + i * stride, rgba + j * stride, stride); + std::memcpy(rgba + j * stride, tmp.get(), stride); + } + } + + return data; +} + namespace { void checkFramebuffer() { diff --git a/src/mbgl/gl/context.hpp b/src/mbgl/gl/context.hpp index 9bfa54fa55..169aa5566e 100644 --- a/src/mbgl/gl/context.hpp +++ b/src/mbgl/gl/context.hpp @@ -62,6 +62,15 @@ public: const Renderbuffer<RenderbufferType::DepthStencil>&); Framebuffer createFramebuffer(const Texture&); + template <typename Image, + TextureFormat format = Image::channels == 4 ? TextureFormat::RGBA + : TextureFormat::Alpha> + Image readFramebuffer(const Size size, bool flip = true) { + static_assert(Image::channels == (format == TextureFormat::RGBA ? 4 : 1), + "image format mismatch"); + return { size, readFramebuffer(size, format, flip) }; + } + // Create a texture from an image with data. template <typename Image> Texture createTexture(const Image& image, TextureUnit unit = 0) { @@ -167,6 +176,7 @@ private: void updateTexture(TextureID, Size size, const void* data, TextureFormat, TextureUnit); UniqueFramebuffer createFramebuffer(); UniqueRenderbuffer createRenderbuffer(RenderbufferType, Size size); + std::unique_ptr<uint8_t[]> readFramebuffer(Size, TextureFormat, bool flip); PrimitiveType operator()(const Points&); PrimitiveType operator()(const Lines&); diff --git a/src/mbgl/gl/types.hpp b/src/mbgl/gl/types.hpp index 6e1bc5f8e1..1697656469 100644 --- a/src/mbgl/gl/types.hpp +++ b/src/mbgl/gl/types.hpp @@ -50,6 +50,10 @@ enum class TextureWrap : bool { Clamp, Repeat }; enum class TextureFormat : uint32_t { RGBA = 0x1908, Alpha = 0x1906, +#if not MBGL_USE_GLES2 + Stencil = 0x1901, + Depth = 0x1902, +#endif // MBGL_USE_GLES2 }; enum class PrimitiveType { |