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Diffstat (limited to 'Source/external/SDL2/src/video/qnx/gl.c')
| -rw-r--r-- | Source/external/SDL2/src/video/qnx/gl.c | 285 |
1 files changed, 285 insertions, 0 deletions
diff --git a/Source/external/SDL2/src/video/qnx/gl.c b/Source/external/SDL2/src/video/qnx/gl.c new file mode 100644 index 0000000..19e1bd4 --- /dev/null +++ b/Source/external/SDL2/src/video/qnx/gl.c @@ -0,0 +1,285 @@ +/* + Simple DirectMedia Layer + Copyright (C) 2017 BlackBerry Limited + + This software is provided 'as-is', without any express or implied + warranty. In no event will the authors be held liable for any damages + arising from the use of this software. + + Permission is granted to anyone to use this software for any purpose, + including commercial applications, and to alter it and redistribute it + freely, subject to the following restrictions: + + 1. The origin of this software must not be misrepresented; you must not + claim that you wrote the original software. If you use this software + in a product, an acknowledgment in the product documentation would be + appreciated but is not required. + 2. Altered source versions must be plainly marked as such, and must not be + misrepresented as being the original software. + 3. This notice may not be removed or altered from any source distribution. +*/ + +#include "../../SDL_internal.h" +#include "sdl_qnx.h" + +static EGLDisplay egl_disp; + +/** + * Detertmines the pixel format to use based on the current display and EGL + * configuration. + * @param egl_conf EGL configuration to use + * @return A SCREEN_FORMAT* constant for the pixel format to use + */ +static int +chooseFormat(EGLConfig egl_conf) +{ + EGLint buffer_bit_depth; + EGLint alpha_bit_depth; + + eglGetConfigAttrib(egl_disp, egl_conf, EGL_BUFFER_SIZE, &buffer_bit_depth); + eglGetConfigAttrib(egl_disp, egl_conf, EGL_ALPHA_SIZE, &alpha_bit_depth); + + switch (buffer_bit_depth) { + case 32: + return SCREEN_FORMAT_RGBX8888; + case 24: + return SCREEN_FORMAT_RGB888; + case 16: + switch (alpha_bit_depth) { + case 4: + return SCREEN_FORMAT_RGBX4444; + case 1: + return SCREEN_FORMAT_RGBA5551; + default: + return SCREEN_FORMAT_RGB565; + } + default: + return 0; + } +} + +/** + * Enumerates the supported EGL configurations and chooses a suitable one. + * @param[out] pconf The chosen configuration + * @param[out] pformat The chosen pixel format + * @return 0 if successful, -1 on error + */ +int +glGetConfig(EGLConfig *pconf, int *pformat) +{ + EGLConfig egl_conf = (EGLConfig)0; + EGLConfig *egl_configs; + EGLint egl_num_configs; + EGLint val; + EGLBoolean rc; + EGLint i; + + // Determine the numbfer of configurations. + rc = eglGetConfigs(egl_disp, NULL, 0, &egl_num_configs); + if (rc != EGL_TRUE) { + return -1; + } + + if (egl_num_configs == 0) { + return -1; + } + + // Allocate enough memory for all configurations. + egl_configs = malloc(egl_num_configs * sizeof(*egl_configs)); + if (egl_configs == NULL) { + return -1; + } + + // Get the list of configurations. + rc = eglGetConfigs(egl_disp, egl_configs, egl_num_configs, + &egl_num_configs); + if (rc != EGL_TRUE) { + free(egl_configs); + return -1; + } + + // Find a good configuration. + for (i = 0; i < egl_num_configs; i++) { + eglGetConfigAttrib(egl_disp, egl_configs[i], EGL_SURFACE_TYPE, &val); + if (!(val & EGL_WINDOW_BIT)) { + continue; + } + + eglGetConfigAttrib(egl_disp, egl_configs[i], EGL_RENDERABLE_TYPE, &val); + if (!(val & EGL_OPENGL_ES2_BIT)) { + continue; + } + + eglGetConfigAttrib(egl_disp, egl_configs[i], EGL_DEPTH_SIZE, &val); + if (val == 0) { + continue; + } + + egl_conf = egl_configs[i]; + break; + } + + free(egl_configs); + *pconf = egl_conf; + *pformat = chooseFormat(egl_conf); + + return 0; +} + +/** + * Initializes the EGL library. + * @param _THIS + * @param name unused + * @return 0 if successful, -1 on error + */ +int +glLoadLibrary(_THIS, const char *name) +{ + EGLNativeDisplayType disp_id = EGL_DEFAULT_DISPLAY; + + egl_disp = eglGetDisplay(disp_id); + if (egl_disp == EGL_NO_DISPLAY) { + return -1; + } + + if (eglInitialize(egl_disp, NULL, NULL) == EGL_FALSE) { + return -1; + } + + return 0; +} + +/** + * Finds the address of an EGL extension function. + * @param proc Function name + * @return Function address + */ +void * +glGetProcAddress(_THIS, const char *proc) +{ + return eglGetProcAddress(proc); +} + +/** + * Associates the given window with the necessary EGL structures for drawing and + * displaying content. + * @param _THIS + * @param window The SDL window to create the context for + * @return A pointer to the created context, if successful, NULL on error + */ +SDL_GLContext +glCreateContext(_THIS, SDL_Window *window) +{ + window_impl_t *impl = (window_impl_t *)window->driverdata; + EGLContext context; + EGLSurface surface; + + struct { + EGLint client_version[2]; + EGLint none; + } egl_ctx_attr = { + .client_version = { EGL_CONTEXT_CLIENT_VERSION, 2 }, + .none = EGL_NONE + }; + + struct { + EGLint render_buffer[2]; + EGLint none; + } egl_surf_attr = { + .render_buffer = { EGL_RENDER_BUFFER, EGL_BACK_BUFFER }, + .none = EGL_NONE + }; + + context = eglCreateContext(egl_disp, impl->conf, EGL_NO_CONTEXT, + (EGLint *)&egl_ctx_attr); + if (context == EGL_NO_CONTEXT) { + return NULL; + } + + surface = eglCreateWindowSurface(egl_disp, impl->conf, impl->window, + (EGLint *)&egl_surf_attr); + if (surface == EGL_NO_SURFACE) { + return NULL; + } + + eglMakeCurrent(egl_disp, surface, surface, context); + + impl->surface = surface; + return context; +} + +/** + * Sets a new value for the number of frames to display before swapping buffers. + * @param _THIS + * @param interval New interval value + * @return 0 if successful, -1 on error + */ +int +glSetSwapInterval(_THIS, int interval) +{ + if (eglSwapInterval(egl_disp, interval) != EGL_TRUE) { + return -1; + } + + return 0; +} + +/** + * Swaps the EGL buffers associated with the given window + * @param _THIS + * @param window Window to swap buffers for + * @return 0 if successful, -1 on error + */ +int +glSwapWindow(_THIS, SDL_Window *window) +{ + /* !!! FIXME: should we migrate this all over to use SDL_egl.c? */ + window_impl_t *impl = (window_impl_t *)window->driverdata; + return eglSwapBuffers(egl_disp, impl->surface) == EGL_TRUE ? 0 : -1; +} + +/** + * Makes the given context the current one for drawing operations. + * @param _THIS + * @param window SDL window associated with the context (maybe NULL) + * @param context The context to activate + * @return 0 if successful, -1 on error + */ +int +glMakeCurrent(_THIS, SDL_Window *window, SDL_GLContext context) +{ + window_impl_t *impl; + EGLSurface surface = NULL; + + if (window) { + impl = (window_impl_t *)window->driverdata; + surface = impl->surface; + } + + if (eglMakeCurrent(egl_disp, surface, surface, context) != EGL_TRUE) { + return -1; + } + + return 0; +} + +/** + * Destroys a context. + * @param _THIS + * @param context The context to destroy + */ +void +glDeleteContext(_THIS, SDL_GLContext context) +{ + eglDestroyContext(egl_disp, context); +} + +/** + * Terminates access to the EGL library. + * @param _THIS + */ +void +glUnloadLibrary(_THIS) +{ + eglTerminate(egl_disp); +} |