SDL_gpu, a library for making hardware-accelerated 2D graphics easy. by Jonathan Dearborn

SDL_gpu is licensed under the terms of the MIT License. See LICENSE.txt for details of the usage license granted to you for this code.

FEATURES

High performance (it automatically collects and submits batches instead of separate draw commands for each sprite and redundant state changes)
Shader API
Arbitrary geometry rendering (triangles)
Can be integrated with explicit OpenGL calls (mixed 2D and 3D)
Full blend state control
Built-in primitive shapes (points, lines, tris, rects, ellipses, polygons, even arcs)
Uses a style familiar to SDL 1.2 users
Compatible with either SDL 1.2 or 2.0
Loads BMP, TGA, and PNG files via stb-image
Rotates and scales about the center of images, making reasoning about the resulting corner coordinates more obvious (adjustable via anchor settings)

HELP OUT

SDL_gpu is free and open source! You can help either by contributing a pull request, filling out a bug report, sending an email, or give me a chance to put more time into it by donating:

Anything you can do to help is really appreciated!

LATEST SOURCE

SDL_gpu is hosted on Github (https://github.com/grimfang4/sdl-gpu). You can check out the latest version of the source code with Git:

git clone https://github.com/grimfang4/sdl-gpu.git sdl-gpu

DEPENDENCIES

SDL 1.2 or SDL 2.0 (www.libsdl.org)
A rendering backend
	Currently implemented:
		OpenGL 1.1, 2.0, 3.0, 4.0
		OpenGL ES 1.1, 2.0, 3.0

BUILDING

You can see automated build status at the project page on Travis CI:

Automated builds will soon be available on the Github.io page.

SDL_gpu uses CMake (www.cmake.org) to coordinate the library build process. CMake is available as a GUI program or on the command line.

For Linux/UNIX systems, run CMake in the base directory:

cmake -G "Unix Makefiles"
make
sudo make install

For Linux/UNIX systems, changing the default installation directory can be done like so:

cmake -G "Unix Makefiles" -DCMAKE_INSTALL_PREFIX=/usr

For Windows systems, you can use cmake-gui and select appropriate options in there (warning: cmake-gui is messy!).

INCLUDING / LINKING

Add the include for SDL_gpu.h to your sources. Link to SDL2_gpu (libSDL2_gpu.a) or SDL_gpu (if you use the old SDL 1.2).

FULL DOCUMENTATION

Documentation is automatically generated with Doxygen (http://sourceforge.net/projects/doxygen).

Pre-generated documentation can be found on the Github.io page: https://grimfang4.github.io/sdl-gpu/

CONVERSION

SDL_gpu can be used to replace the SDL_Render subsystem of SDL2. SDL_gpu uses GPU_Target to represent a render target (a render destination, e.g. the screen) instead of an SDL_Renderer object. SDL_gpu also uses GPU_Image as a texture container (a render source) instead of SDL_Texture.

Here is a list of most of the comparable functions:

SDL_CreateWindow() : Either use GPU_SetInitWindow() or replace with GPU_Init()
SDL_CreateRenderer() : GPU_Init()
SDL_LoadBMP() : GPU_LoadImage() or GPU_LoadSurface()
SDL_CreateTextureFromSurface() : GPU_CopyImageFromSurface()
SDL_SetRenderDrawColor() : Pass color into rendering function (e.g. GPU_ClearRGBA(), GPU_Line())
SDL_RenderClear() : GPU_Clear(), GPU_ClearRGBA()
SDL_QueryTexture() : image->w, image->h
SDL_RenderCopy() : GPU_Blit() or GPU_BlitRect()
SDL_RenderPresent() : GPU_Flip()
SDL_DestroyTexture() : GPU_FreeImage()
SDL_DestroyRenderer() : GPU_FreeTarget() (but don't free the screen target yourself)

SDL_RenderDrawPoint() : GPU_Pixel()
SDL_RenderDrawLine() : GPU_Line()
SDL_RenderDrawRect() : GPU_Rectangle()
SDL_RenderFillRect() : GPU_RectangleFilled()
SDL_RenderCopyEx() : GPU_BlitRotate() or GPU_BlitScale() or GPU_BlitTransform()
SDL_SetRenderDrawBlendMode() : GPU_SetShapeBlendMode()
SDL_SetTextureBlendMode() : GPU_SetBlendMode()
SDL_SetTextureColorMod() : GPU_SetRGBA() or GPU_SetColor()
SDL_SetTextureAlphaMod() : GPU_SetRGBA() or GPU_SetColor()
SDL_UpdateTexture() : GPU_UpdateImage() or GPU_UpdateImageBytes()
SDL_RenderSetClipRect() : GPU_SetClip() or GPU_SetClipRect()
SDL_RenderReadPixels() : GPU_CopySurfaceFromTarget() or GPU_CopySurfaceFromImage()
SDL_RenderSetViewport() : GPU_SetViewport()
SDL_SetRenderTarget() : GPU_LoadTarget()

Some SDL functions use a rectangular region passed as an SDL_Rect. SDL_gpu uses floating point coordinates for subpixel precision, so you may have to use GPU_Rect for some SDL_gpu functions.

License

flowkey/sdl-gpu

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