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-rw-r--r--src/egl.c275
1 files changed, 275 insertions, 0 deletions
diff --git a/src/egl.c b/src/egl.c
new file mode 100644
index 0000000..05819c2
--- /dev/null
+++ b/src/egl.c
@@ -0,0 +1,275 @@
+#include "../include/egl.h"
+#include "../include/library_loader.h"
+#include <string.h>
+
+static bool gsr_egl_create_window(gsr_egl *self) {
+ EGLDisplay egl_display = NULL;
+ EGLConfig ecfg;
+ int32_t num_config;
+ EGLSurface egl_surface;
+ EGLContext egl_context;
+
+ int32_t attr[] = {
+ EGL_BUFFER_SIZE, 24,
+ EGL_RENDERABLE_TYPE,
+ EGL_OPENGL_ES2_BIT,
+ EGL_NONE
+ };
+
+ int32_t ctxattr[] = {
+ EGL_CONTEXT_CLIENT_VERSION, 2,
+ EGL_NONE
+ };
+
+ // TODO: Is there a way to remove the need to create a window?
+ Window window = XCreateWindow(self->dpy, DefaultRootWindow(self->dpy), 0, 0, 1, 1, 0, CopyFromParent, InputOutput, CopyFromParent, 0, NULL);
+
+ if(!window) {
+ fprintf(stderr, "gsr error: gsr_gl_create_window failed: failed to create gl window\n");
+ goto fail;
+ }
+
+ egl_display = self->eglGetDisplay(self->dpy);
+ if(!egl_display) {
+ fprintf(stderr, "gsr error: gsr_egl_create_window failed: eglGetDisplay failed\n");
+ return false;
+ }
+
+ if(!self->eglInitialize(egl_display, NULL, NULL)) {
+ fprintf(stderr, "gsr error: gsr_egl_create_window failed: eglInitialize failed\n");
+ return false;
+ }
+
+ // TODO: Cleanup ecfg?
+ if (!self->eglChooseConfig( egl_display, attr, &ecfg, 1, &num_config ) ) {
+ //cerr << "Failed to choose config (eglError: " << eglGetError() << ")" << endl;
+ return false;
+ }
+
+ if ( num_config != 1 ) {
+ //cerr << "Didn't get exactly one config, but " << num_config << endl;
+ return false;
+ }
+
+ egl_surface = self->eglCreateWindowSurface ( egl_display, ecfg, (EGLNativeWindowType)window, NULL );
+ if ( !egl_surface ) {
+ //cerr << "Unable to create EGL surface (eglError: " << eglGetError() << ")" << endl;
+ return false;
+ }
+
+ //// egl-contexts collect all state descriptions needed required for operation
+ egl_context = self->eglCreateContext ( egl_display, ecfg, NULL, ctxattr );
+ if ( !egl_context ) {
+ //cerr << "Unable to create EGL context (eglError: " << eglGetError() << ")" << endl;
+ return false;
+ }
+
+ //// associate the egl-context with the egl-surface
+ self->eglMakeCurrent( egl_display, egl_surface, egl_surface, egl_context );
+
+ self->egl_display = egl_display;
+ self->egl_surface = egl_surface;
+ self->egl_context = egl_context;
+ self->window = window;
+ return true;
+
+ fail:
+ // TODO:
+ /*
+ if(window)
+ XDestroyWindow(self->dpy, window);
+ if(colormap)
+ XFreeColormap(self->dpy, colormap);
+ if(gl_context)
+ self->glXDestroyContext(self->dpy, gl_context);
+ if(visual_info)
+ XFree(visual_info);
+ XFree(fbconfigs);
+ */
+ return False;
+}
+
+static bool gsr_egl_load_egl(gsr_egl *self, void *library) {
+ dlsym_assign required_dlsym[] = {
+ { (void**)&self->eglGetDisplay, "eglGetDisplay" },
+ { (void**)&self->eglInitialize, "eglInitialize" },
+ { (void**)&self->eglChooseConfig, "eglChooseConfig" },
+ { (void**)&self->eglCreateWindowSurface, "eglCreateWindowSurface" },
+ { (void**)&self->eglCreateContext, "eglCreateContext" },
+ { (void**)&self->eglMakeCurrent, "eglMakeCurrent" },
+ { (void**)&self->eglCreatePixmapSurface, "eglCreatePixmapSurface" },
+ { (void**)&self->eglCreateImage, "eglCreateImage" }, // TODO: eglCreateImageKHR
+ { (void**)&self->eglBindTexImage, "eglBindTexImage" },
+ { (void**)&self->eglSwapInterval, "eglSwapInterval" },
+ { (void**)&self->eglSwapBuffers, "eglSwapBuffers" },
+ { (void**)&self->eglGetProcAddress, "eglGetProcAddress" },
+
+ { NULL, NULL }
+ };
+
+ if(!dlsym_load_list(library, required_dlsym)) {
+ fprintf(stderr, "gsr error: gsr_egl_load failed: missing required symbols in libEGL.so.1\n");
+ return false;
+ }
+
+ return true;
+}
+
+static bool gsr_egl_mesa_load_egl(gsr_egl *self) {
+ self->eglExportDMABUFImageQueryMESA = self->eglGetProcAddress("eglExportDMABUFImageQueryMESA");
+ self->eglExportDMABUFImageMESA = self->eglGetProcAddress("eglExportDMABUFImageMESA");
+ self->glEGLImageTargetTexture2DOES = self->eglGetProcAddress("glEGLImageTargetTexture2DOES");
+
+ if(!self->eglExportDMABUFImageQueryMESA) {
+ fprintf(stderr, "could not find eglExportDMABUFImageQueryMESA\n");
+ return false;
+ }
+
+ if(!self->eglExportDMABUFImageMESA) {
+ fprintf(stderr, "could not find eglExportDMABUFImageMESA\n");
+ return false;
+ }
+
+ if(!self->glEGLImageTargetTexture2DOES) {
+ fprintf(stderr, "could not find glEGLImageTargetTexture2DOES\n");
+ return false;
+ }
+
+ return true;
+}
+
+static bool gsr_egl_load_gl(gsr_egl *self, void *library) {
+ dlsym_assign required_dlsym[] = {
+ { (void**)&self->glGetError, "glGetError" },
+ { (void**)&self->glGetString, "glGetString" },
+ { (void**)&self->glClear, "glClear" },
+ { (void**)&self->glClearColor, "glClearColor" },
+ { (void**)&self->glGenTextures, "glGenTextures" },
+ { (void**)&self->glDeleteTextures, "glDeleteTextures" },
+ { (void**)&self->glBindTexture, "glBindTexture" },
+ { (void**)&self->glTexParameteri, "glTexParameteri" },
+ { (void**)&self->glGetTexLevelParameteriv, "glGetTexLevelParameteriv" },
+ { (void**)&self->glTexImage2D, "glTexImage2D" },
+ { (void**)&self->glCopyImageSubData, "glCopyImageSubData" },
+ { (void**)&self->glGenFramebuffers, "glGenFramebuffers" },
+ { (void**)&self->glBindFramebuffer, "glBindFramebuffer" },
+ { (void**)&self->glViewport, "glViewport" },
+ { (void**)&self->glFramebufferTexture2D, "glFramebufferTexture2D" },
+ { (void**)&self->glDrawBuffers, "glDrawBuffers" },
+ { (void**)&self->glCheckFramebufferStatus, "glCheckFramebufferStatus" },
+ { (void**)&self->glBindBuffer, "glBindBuffer" },
+ { (void**)&self->glGenBuffers, "glGenBuffers" },
+ { (void**)&self->glBufferData, "glBufferData" },
+ { (void**)&self->glGetUniformLocation, "glGetUniformLocation" },
+ { (void**)&self->glGenVertexArrays, "glGenVertexArrays" },
+ { (void**)&self->glBindVertexArray, "glBindVertexArray" },
+ { (void**)&self->glCreateProgram, "glCreateProgram" },
+ { (void**)&self->glCreateShader, "glCreateShader" },
+ { (void**)&self->glAttachShader, "glAttachShader" },
+ { (void**)&self->glBindAttribLocation, "glBindAttribLocation" },
+ { (void**)&self->glCompileShader, "glCompileShader" },
+ { (void**)&self->glLinkProgram, "glLinkProgram" },
+ { (void**)&self->glShaderSource, "glShaderSource" },
+ { (void**)&self->glUseProgram, "glUseProgram" },
+ { (void**)&self->glGetProgramInfoLog, "glGetProgramInfoLog" },
+ { (void**)&self->glGetShaderiv, "glGetShaderiv" },
+ { (void**)&self->glGetShaderInfoLog, "glGetShaderInfoLog" },
+ { (void**)&self->glGetShaderSource, "glGetShaderSource" },
+ { (void**)&self->glDeleteProgram, "glDeleteProgram" },
+ { (void**)&self->glDeleteShader, "glDeleteShader" },
+ { (void**)&self->glGetProgramiv, "glGetProgramiv" },
+ { (void**)&self->glVertexAttribPointer, "glVertexAttribPointer" },
+ { (void**)&self->glEnableVertexAttribArray, "glEnableVertexAttribArray" },
+ { (void**)&self->glDrawArrays, "glDrawArrays" },
+ { (void**)&self->glReadBuffer, "glReadBuffer" },
+ { (void**)&self->glReadPixels, "glReadPixels" },
+
+ { NULL, NULL }
+ };
+
+ if(!dlsym_load_list(library, required_dlsym)) {
+ fprintf(stderr, "gsr error: gsr_egl_load failed: missing required symbols in libGL.so.1\n");
+ return false;
+ }
+
+ return true;
+}
+
+bool gsr_egl_load(gsr_egl *self, Display *dpy) {
+ memset(self, 0, sizeof(gsr_egl));
+ self->dpy = dpy;
+
+ dlerror(); /* clear */
+ void *egl_lib = dlopen("libEGL.so.1", RTLD_LAZY);
+ if(!egl_lib) {
+ fprintf(stderr, "gsr error: gsr_egl_load: failed to load libEGL.so.1, error: %s\n", dlerror());
+ return false;
+ }
+
+ void *gl_lib = dlopen("libGL.so.1", RTLD_LAZY);
+ if(!egl_lib) {
+ fprintf(stderr, "gsr error: gsr_egl_load: failed to load libGL.so.1, error: %s\n", dlerror());
+ dlclose(egl_lib);
+ memset(self, 0, sizeof(gsr_egl));
+ return false;
+ }
+
+ if(!gsr_egl_load_egl(self, egl_lib)) {
+ dlclose(egl_lib);
+ dlclose(gl_lib);
+ memset(self, 0, sizeof(gsr_egl));
+ return false;
+ }
+
+ if(!gsr_egl_load_gl(self, gl_lib)) {
+ dlclose(egl_lib);
+ dlclose(gl_lib);
+ memset(self, 0, sizeof(gsr_egl));
+ return false;
+ }
+
+ if(!gsr_egl_mesa_load_egl(self)) {
+ dlclose(egl_lib);
+ dlclose(gl_lib);
+ memset(self, 0, sizeof(gsr_egl));
+ return false;
+ }
+
+ if(!gsr_egl_create_window(self)) {
+ dlclose(egl_lib);
+ dlclose(gl_lib);
+ memset(self, 0, sizeof(gsr_egl));
+ return false;
+ }
+
+ self->egl_library = egl_lib;
+ self->gl_library = gl_lib;
+ return true;
+}
+
+bool gsr_egl_make_context_current(gsr_egl *self) {
+ // TODO:
+ return true;
+ //return self->glXMakeContextCurrent(self->dpy, self->window, self->window, self->gl_context);
+}
+
+void gsr_egl_unload(gsr_egl *self) {
+ // TODO: Cleanup of egl resources
+
+ if(self->window) {
+ XDestroyWindow(self->dpy, self->window);
+ self->window = None;
+ }
+
+ if(self->egl_library) {
+ dlclose(self->egl_library);
+ self->egl_library = NULL;
+ }
+
+ if(self->gl_library) {
+ dlclose(self->gl_library);
+ self->gl_library = NULL;
+ }
+
+ memset(self, 0, sizeof(gsr_egl));
+}
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