wlroots/render/egl.c

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#include <EGL/egl.h>
#include <EGL/eglext.h>
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#include <GLES2/gl2.h>
#include <stdlib.h>
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#include <wlr/util/log.h>
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#include <wlr/egl.h>
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#include "render/glapi.h"
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// Extension documentation
// https://www.khronos.org/registry/EGL/extensions/KHR/EGL_KHR_image_base.txt.
// https://cgit.freedesktop.org/mesa/mesa/tree/docs/specs/WL_bind_wayland_display.spec
const char *egl_error(void) {
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switch (eglGetError()) {
case EGL_SUCCESS:
return "Success";
case EGL_NOT_INITIALIZED:
return "Not initialized";
case EGL_BAD_ACCESS:
return "Bad access";
case EGL_BAD_ALLOC:
return "Bad alloc";
case EGL_BAD_ATTRIBUTE:
return "Bad attribute";
case EGL_BAD_CONTEXT:
return "Bad Context";
case EGL_BAD_CONFIG:
return "Bad Config";
case EGL_BAD_CURRENT_SURFACE:
return "Bad current surface";
case EGL_BAD_DISPLAY:
return "Bad display";
case EGL_BAD_SURFACE:
return "Bad surface";
case EGL_BAD_MATCH:
return "Bad match";
case EGL_BAD_PARAMETER:
return "Bad parameter";
case EGL_BAD_NATIVE_PIXMAP:
return "Bad native pixmap";
case EGL_BAD_NATIVE_WINDOW:
return "Bad native window";
case EGL_CONTEXT_LOST:
return "Context lost";
default:
return "Unknown";
}
}
static bool egl_get_config(EGLDisplay disp, EGLConfig *out, EGLint visual_id) {
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EGLint count = 0, matched = 0, ret;
ret = eglGetConfigs(disp, NULL, 0, &count);
if (ret == EGL_FALSE || count == 0) {
wlr_log(L_ERROR, "eglGetConfigs returned no configs");
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return false;
}
EGLConfig configs[count];
ret = eglChooseConfig(disp, NULL, configs, count, &matched);
if (ret == EGL_FALSE) {
wlr_log(L_ERROR, "eglChooseConfig failed");
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return false;
}
for (int i = 0; i < matched; ++i) {
EGLint visual;
if (!eglGetConfigAttrib(disp, configs[i],
EGL_NATIVE_VISUAL_ID, &visual)) {
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continue;
}
if (visual == visual_id) {
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*out = configs[i];
return true;
}
}
wlr_log(L_ERROR, "no valid egl config found");
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return false;
}
bool wlr_egl_init(struct wlr_egl *egl, EGLenum platform, EGLint visual_id,
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void *remote_display) {
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if (!load_glapi()) {
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return false;
}
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if (eglBindAPI(EGL_OPENGL_ES_API) == EGL_FALSE) {
wlr_log(L_ERROR, "Failed to bind to the OpenGL ES API: %s", egl_error());
goto error;
}
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egl->display = eglGetPlatformDisplayEXT(platform, remote_display, NULL);
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if (egl->display == EGL_NO_DISPLAY) {
wlr_log(L_ERROR, "Failed to create EGL display: %s", egl_error());
goto error;
}
EGLint major, minor;
if (eglInitialize(egl->display, &major, &minor) == EGL_FALSE) {
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wlr_log(L_ERROR, "Failed to initialize EGL: %s", egl_error());
goto error;
}
if (!egl_get_config(egl->display, &egl->config, visual_id)) {
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wlr_log(L_ERROR, "Failed to get EGL config");
goto error;
}
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static const EGLint attribs[] = {EGL_CONTEXT_CLIENT_VERSION, 2, EGL_NONE};
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egl->context = eglCreateContext(egl->display, egl->config,
EGL_NO_CONTEXT, attribs);
if (egl->context == EGL_NO_CONTEXT) {
wlr_log(L_ERROR, "Failed to create EGL context: %s", egl_error());
goto error;
}
eglMakeCurrent(egl->display, EGL_NO_SURFACE, EGL_NO_SURFACE, egl->context);
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egl->egl_exts = eglQueryString(egl->display, EGL_EXTENSIONS);
if (strstr(egl->egl_exts, "EGL_WL_bind_wayland_display") == NULL ||
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strstr(egl->egl_exts, "EGL_KHR_image_base") == NULL) {
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wlr_log(L_ERROR, "Required egl extensions not supported");
goto error;
}
egl->gl_exts = (const char*) glGetString(GL_EXTENSIONS);
wlr_log(L_INFO, "Using EGL %d.%d", (int)major, (int)minor);
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wlr_log(L_INFO, "Supported EGL extensions: %s", egl->egl_exts);
wlr_log(L_INFO, "Using %s", glGetString(GL_VERSION));
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wlr_log(L_INFO, "Supported OpenGL ES extensions: %s", egl->gl_exts);
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return true;
error:
eglMakeCurrent(EGL_NO_DISPLAY, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
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eglTerminate(egl->display);
eglReleaseThread();
return false;
}
void wlr_egl_free(struct wlr_egl *egl) {
eglMakeCurrent(EGL_NO_DISPLAY, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
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if (egl->wl_display && eglUnbindWaylandDisplayWL) {
eglUnbindWaylandDisplayWL(egl->display, egl->wl_display);
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}
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eglDestroyContext(egl->display, egl->context);
eglTerminate(egl->display);
eglReleaseThread();
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}
bool wlr_egl_bind_display(struct wlr_egl *egl, struct wl_display *local_display) {
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if (!eglBindWaylandDisplayWL) {
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return false;
}
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if (eglBindWaylandDisplayWL(egl->display, local_display)) {
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egl->wl_display = local_display;
return true;
}
return false;
}
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bool wlr_egl_query_buffer(struct wlr_egl *egl, struct wl_resource *buf,
int attrib, int *value) {
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if (!eglQueryWaylandBufferWL) {
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return false;
}
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return eglQueryWaylandBufferWL(egl->display, buf, attrib, value);
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}
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EGLImage wlr_egl_create_image(struct wlr_egl *egl, EGLenum target,
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EGLClientBuffer buffer, const EGLint *attribs) {
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if (!eglCreateImageKHR) {
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return false;
}
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return eglCreateImageKHR(egl->display, egl->context, target,
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buffer, attribs);
}
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bool wlr_egl_destroy_image(struct wlr_egl *egl, EGLImage image) {
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if (!eglDestroyImageKHR) {
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return false;
}
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eglDestroyImageKHR(egl->display, image);
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return true;
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}
EGLSurface wlr_egl_create_surface(struct wlr_egl *egl, void *window) {
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EGLSurface surf = eglCreatePlatformWindowSurfaceEXT(egl->display, egl->config,
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window, NULL);
if (surf == EGL_NO_SURFACE) {
wlr_log(L_ERROR, "Failed to create EGL surface: %s", egl_error());
return EGL_NO_SURFACE;
}
return surf;
}