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-rw-r--r--src/opengl/context.c332
1 files changed, 332 insertions, 0 deletions
diff --git a/src/opengl/context.c b/src/opengl/context.c
new file mode 100644
index 0000000..6ca14b8
--- /dev/null
+++ b/src/opengl/context.c
@@ -0,0 +1,332 @@
+/*
+ * This file is part of libplacebo.
+ *
+ * libplacebo is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * libplacebo is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with libplacebo. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <ctype.h>
+
+#include "common.h"
+#include "utils.h"
+#include "gpu.h"
+
+const struct pl_opengl_params pl_opengl_default_params = {0};
+
+static void GLAPIENTRY debug_cb(GLenum source, GLenum type, GLuint id,
+ GLenum severity, GLsizei length,
+ const GLchar *message, const void *userParam)
+{
+ pl_log log = (void *) userParam;
+ enum pl_log_level level = PL_LOG_ERR;
+
+ switch (severity) {
+ case GL_DEBUG_SEVERITY_NOTIFICATION:level = PL_LOG_DEBUG; break;
+ case GL_DEBUG_SEVERITY_LOW: level = PL_LOG_INFO; break;
+ case GL_DEBUG_SEVERITY_MEDIUM: level = PL_LOG_WARN; break;
+ case GL_DEBUG_SEVERITY_HIGH: level = PL_LOG_ERR; break;
+ }
+
+ pl_msg(log, level, "GL: %s", message);
+
+ if (level <= PL_LOG_ERR)
+ pl_log_stack_trace(log, level);
+}
+
+static void GLAPIENTRY debug_cb_egl(EGLenum error, const char *command,
+ EGLint messageType, EGLLabelKHR threadLabel,
+ EGLLabelKHR objectLabel, const char *message)
+{
+ pl_log log = threadLabel;
+ enum pl_log_level level = PL_LOG_ERR;
+
+ switch (messageType) {
+ case EGL_DEBUG_MSG_CRITICAL_KHR: level = PL_LOG_FATAL; break;
+ case EGL_DEBUG_MSG_ERROR_KHR: level = PL_LOG_ERR; break;
+ case EGL_DEBUG_MSG_WARN_KHR: level = PL_LOG_WARN; break;
+ case EGL_DEBUG_MSG_INFO_KHR: level = PL_LOG_DEBUG; break;
+ }
+
+ pl_msg(log, level, "EGL: %s: %s %s", command, egl_err_str(error),
+ message);
+
+ if (level <= PL_LOG_ERR)
+ pl_log_stack_trace(log, level);
+}
+
+// Guards access to the (thread-unsafe) glad global EGL state
+static pl_static_mutex glad_egl_mutex = PL_STATIC_MUTEX_INITIALIZER;
+
+void pl_opengl_destroy(pl_opengl *ptr)
+{
+ pl_opengl pl_gl = *ptr;
+ if (!pl_gl)
+ return;
+
+ struct gl_ctx *p = PL_PRIV(pl_gl);
+ gl_funcs *gl = &p->func;
+ if (!gl_make_current(pl_gl)) {
+ PL_WARN(p, "Failed uninitializing OpenGL context, leaking resources!");
+ return;
+ }
+
+ if (p->is_debug)
+ gl->DebugMessageCallback(NULL, NULL);
+
+ if (p->is_debug_egl)
+ eglDebugMessageControlKHR(NULL, NULL);
+
+ pl_gpu_destroy(pl_gl->gpu);
+
+#ifdef PL_HAVE_GL_PROC_ADDR
+ if (p->is_gles) {
+ gladLoaderUnloadGLES2Context(gl);
+ } else {
+ gladLoaderUnloadGLContext(gl);
+ }
+
+ bool used_loader = !p->params.get_proc_addr && !p->params.get_proc_addr_ex;
+ if (p->params.egl_display && used_loader) {
+ pl_static_mutex_lock(&glad_egl_mutex);
+ gladLoaderUnloadEGL();
+ pl_static_mutex_unlock(&glad_egl_mutex);
+ }
+#endif
+
+ gl_release_current(pl_gl);
+ pl_mutex_destroy(&p->lock);
+ pl_free_ptr((void **) ptr);
+
+}
+
+typedef PL_ARRAY(const char *) ext_arr_t;
+static void add_exts_str(void *alloc, ext_arr_t *arr, const char *extstr)
+{
+ pl_str rest = pl_str_strip(pl_str0(pl_strdup0(alloc, pl_str0(extstr))));
+ while (rest.len) {
+ pl_str ext = pl_str_split_char(rest, ' ', &rest);
+ ext.buf[ext.len] = '\0'; // re-use separator for terminator
+ PL_ARRAY_APPEND(alloc, *arr, (char *) ext.buf);
+ }
+}
+
+pl_opengl pl_opengl_create(pl_log log, const struct pl_opengl_params *params)
+{
+ params = PL_DEF(params, &pl_opengl_default_params);
+ struct pl_opengl_t *pl_gl = pl_zalloc_obj(NULL, pl_gl, struct gl_ctx);
+ struct gl_ctx *p = PL_PRIV(pl_gl);
+ gl_funcs *gl = &p->func;
+ p->params = *params;
+ p->log = log;
+
+ pl_mutex_init_type(&p->lock, PL_MUTEX_RECURSIVE);
+ if (!gl_make_current(pl_gl)) {
+ pl_free(pl_gl);
+ return NULL;
+ }
+
+ bool ok;
+ if (params->get_proc_addr_ex) {
+ ok = gladLoadGLContextUserPtr(gl, params->get_proc_addr_ex, params->proc_ctx);
+ } else if (params->get_proc_addr) {
+ ok = gladLoadGLContext(gl, params->get_proc_addr);
+ } else {
+#ifdef PL_HAVE_GL_PROC_ADDR
+ ok = gladLoaderLoadGLContext(gl);
+#else
+ PL_FATAL(p, "No `glGetProcAddress` function provided, and libplacebo "
+ "built without its built-in OpenGL loader!");
+ goto error;
+#endif
+ }
+
+ if (!ok) {
+ PL_INFO(p, "Failed loading core GL, retrying as GLES...");
+ } else if (gl_is_gles(pl_gl)) {
+ PL_INFO(p, "GL context seems to be OpenGL ES, reloading as GLES...");
+ ok = false;
+ }
+
+ if (!ok) {
+ memset(gl, 0, sizeof(*gl));
+ if (params->get_proc_addr_ex) {
+ ok = gladLoadGLES2ContextUserPtr(gl, params->get_proc_addr_ex, params->proc_ctx);
+ } else if (params->get_proc_addr) {
+ ok = gladLoadGLES2Context(gl, params->get_proc_addr);
+ } else {
+#ifdef PL_HAVE_GL_PROC_ADDR
+ ok = gladLoaderLoadGLES2Context(gl);
+#else
+ pl_unreachable();
+#endif
+ }
+ p->is_gles = ok;
+ }
+
+ if (!ok) {
+ PL_FATAL(p, "Failed to initialize OpenGL context - make sure a valid "
+ "OpenGL context is bound to the current thread!");
+ goto error;
+ }
+
+ const char *version = (const char *) gl->GetString(GL_VERSION);
+ if (version) {
+ const char *ver = version;
+ while (!isdigit(*ver) && *ver != '\0')
+ ver++;
+ if (sscanf(ver, "%d.%d", &pl_gl->major, &pl_gl->minor) != 2) {
+ PL_FATAL(p, "Invalid GL_VERSION string: %s\n", version);
+ goto error;
+ }
+ }
+
+ if (!pl_gl->major) {
+ PL_FATAL(p, "No OpenGL version detected - make sure an OpenGL context "
+ "is bound to the current thread!");
+ goto error;
+ }
+
+ static const int gl_ver_req = 3;
+ if (pl_gl->major < gl_ver_req) {
+ PL_FATAL(p, "OpenGL version too old (%d < %d), please use a newer "
+ "OpenGL implementation or downgrade libplacebo!",
+ pl_gl->major, gl_ver_req);
+ goto error;
+ }
+
+ PL_INFO(p, "Detected OpenGL version strings:");
+ PL_INFO(p, " GL_VERSION: %s", version);
+ PL_INFO(p, " GL_VENDOR: %s", (char *) gl->GetString(GL_VENDOR));
+ PL_INFO(p, " GL_RENDERER: %s", (char *) gl->GetString(GL_RENDERER));
+
+ ext_arr_t exts = {0};
+ if (pl_gl->major >= 3) {
+ gl->GetIntegerv(GL_NUM_EXTENSIONS, &exts.num);
+ PL_ARRAY_RESIZE(pl_gl, exts, exts.num);
+ for (int i = 0; i < exts.num; i++)
+ exts.elem[i] = (const char *) gl->GetStringi(GL_EXTENSIONS, i);
+ } else {
+ add_exts_str(pl_gl, &exts, (const char *) gl->GetString(GL_EXTENSIONS));
+ }
+
+ if (pl_msg_test(log, PL_LOG_DEBUG)) {
+ PL_DEBUG(p, " GL_EXTENSIONS:");
+ for (int i = 0; i < exts.num; i++)
+ PL_DEBUG(p, " %s", exts.elem[i]);
+ }
+
+ if (params->egl_display) {
+ pl_static_mutex_lock(&glad_egl_mutex);
+ if (params->get_proc_addr_ex) {
+ ok = gladLoadEGLUserPtr(params->egl_display, params->get_proc_addr_ex,
+ params->proc_ctx);
+ } else if (params->get_proc_addr) {
+ ok = gladLoadEGL(params->egl_display, params->get_proc_addr);
+ } else {
+#ifdef PL_HAVE_GL_PROC_ADDR
+ ok = gladLoaderLoadEGL(params->egl_display);
+#else
+ pl_unreachable();
+#endif
+ }
+ pl_static_mutex_unlock(&glad_egl_mutex);
+
+ if (!ok) {
+ PL_FATAL(p, "Failed loading EGL functions - double check EGLDisplay?");
+ goto error;
+ }
+
+ int start = exts.num;
+ add_exts_str(pl_gl, &exts, eglQueryString(params->egl_display,
+ EGL_EXTENSIONS));
+ if (exts.num > start) {
+ PL_DEBUG(p, " EGL_EXTENSIONS:");
+ for (int i = start; i < exts.num; i++)
+ PL_DEBUG(p, " %s", exts.elem[i]);
+ }
+ }
+
+ pl_gl->extensions = exts.elem;
+ pl_gl->num_extensions = exts.num;
+
+ if (!params->allow_software && gl_is_software(pl_gl)) {
+ PL_FATAL(p, "OpenGL context is suspected to be a software rasterizer, "
+ "but `allow_software` is false.");
+ goto error;
+ }
+
+ if (params->debug) {
+ if (pl_opengl_has_ext(pl_gl, "GL_KHR_debug")) {
+ gl->DebugMessageCallback(debug_cb, log);
+ gl->Enable(GL_DEBUG_OUTPUT);
+ p->is_debug = true;
+ } else {
+ PL_WARN(p, "OpenGL debugging requested, but GL_KHR_debug is not "
+ "available... ignoring!");
+ }
+
+ if (params->egl_display && pl_opengl_has_ext(pl_gl, "EGL_KHR_debug")) {
+ static const EGLAttrib attribs[] = {
+ // Enable everything under the sun, because the `pl_ctx` log
+ // level may change at runtime.
+ EGL_DEBUG_MSG_CRITICAL_KHR, EGL_TRUE,
+ EGL_DEBUG_MSG_ERROR_KHR, EGL_TRUE,
+ EGL_DEBUG_MSG_WARN_KHR, EGL_TRUE,
+ EGL_DEBUG_MSG_INFO_KHR, EGL_TRUE,
+ EGL_NONE,
+ };
+
+ eglDebugMessageControlKHR(debug_cb_egl, attribs);
+ eglLabelObjectKHR(NULL, EGL_OBJECT_THREAD_KHR, NULL, (void *) log);
+ p->is_debug_egl = true;
+ }
+ }
+
+ pl_gl->gpu = pl_gpu_create_gl(log, pl_gl, params);
+ if (!pl_gl->gpu)
+ goto error;
+
+ gl_release_current(pl_gl);
+ return pl_gl;
+
+error:
+ PL_FATAL(p, "Failed initializing opengl context!");
+ gl_release_current(pl_gl);
+ pl_opengl_destroy((pl_opengl *) &pl_gl);
+ return NULL;
+}
+
+bool gl_make_current(pl_opengl pl_gl)
+{
+ struct gl_ctx *p = PL_PRIV(pl_gl);
+ pl_mutex_lock(&p->lock);
+ if (!p->count && p->params.make_current) {
+ if (!p->params.make_current(p->params.priv)) {
+ PL_ERR(p, "Failed making OpenGL context current on calling thread!");
+ pl_mutex_unlock(&p->lock);
+ return false;
+ }
+ }
+
+ p->count++;
+ return true;
+}
+
+void gl_release_current(pl_opengl pl_gl)
+{
+ struct gl_ctx *p = PL_PRIV(pl_gl);
+ p->count--;
+ if (!p->count && p->params.release_current)
+ p->params.release_current(p->params.priv);
+ pl_mutex_unlock(&p->lock);
+}