project for a (works on my devices) demo
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beno
138
SOURCES/graphics/os/EGL/egl_context.c
Normal file
138
SOURCES/graphics/os/EGL/egl_context.c
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#include "egl_context.h"
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#include <stdlib.h>
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#include <stdio.h>
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void printEGLError(){
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EGLint errorCode = eglGetError();
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switch (errorCode){
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case EGL_SUCCESS:
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printf("EGL_SUCCESS : The last function succeeded without error.\n");
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break;
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case EGL_NOT_INITIALIZED:
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printf("EGL_NOT_INITIALIZED : EGL is not initialized, or could not be initialized, for the specified EGL display connection.\n");
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break;
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case EGL_BAD_ACCESS:
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printf("EGL_BAD_ACCESS : EGL cannot access a requested resource (for example a context is bound in another thread).\n");
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break;
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case EGL_BAD_ALLOC:
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printf("EGL_BAD_ALLOC : EGL failed to allocate resources for the requested operation.\n");
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break;
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case EGL_BAD_ATTRIBUTE:
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printf("EGL_BAD_ATTRIBUTE : An unrecognized attribute or attribute value was passed in the attribute list.\n");
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break;
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case EGL_BAD_CONTEXT:
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printf("EGL_BAD_CONTEXT : An EGLContext argument does not name a valid EGL rendering context.\n");
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break;
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case EGL_BAD_CONFIG:
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printf("EGL_BAD_CONFIG : An EGLConfig argument does not name a valid EGL frame buffer configuration.\n");
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break;
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case EGL_BAD_CURRENT_SURFACE:
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printf("EGL_BAD_CURRENT_SURFACE : The current surface of the calling thread is a window, pixel buffer or pixmap that is no longer valid.\n");
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break;
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case EGL_BAD_DISPLAY:
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printf("EGL_BAD_DISPLAY : An EGLDisplay argument does not name a valid EGL display connection.\n");
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break;
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case EGL_BAD_SURFACE:
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printf("EGL_BAD_SURFACE : An EGLSurface argument does not name a valid surface (window, pixel buffer or pixmap) configured for GL rendering.\n");
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break;
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case EGL_BAD_MATCH:
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printf("EGL_BAD_MATCH : Arguments are inconsistent (for example, a valid context requires buffers not supplied by a valid surface).\n");
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break;
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case EGL_BAD_PARAMETER:
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printf("EGL_BAD_PARAMETER : One or more argument values are invalid.\n");
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break;
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case EGL_BAD_NATIVE_PIXMAP:
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printf("EGL_BAD_NATIVE_PIXMAP : A NativePixmapType argument does not refer to a valid native pixmap.\n");
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break;
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case EGL_BAD_NATIVE_WINDOW:
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printf("EGL_BAD_NATIVE_WINDOW : A NativeWindowType argument does not refer to a valid native window.\n");
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break;
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case EGL_CONTEXT_LOST:
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printf("EGL_CONTEXT_LOST : A power management event has occurred. The application must destroy all contexts and reinitialise OpenGL ES state and objects to continue rendering.\n");
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break;
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default:
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printf("UNKNOWN : wtf dude\n");
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}
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}
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egl_context *egl_context_malloc() {
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return malloc( sizeof( egl_context));
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}
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/*
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wl_display, wl_surface, w, h
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egl_window CREATE
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egl_display CREATE
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egl_config FIND
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egl_surface CREATE
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egl_context CREATE
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*/
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egl_context *egl_context_new( struct wl_display *display) {
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EGLint major;
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EGLint minor;
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EGLint num_configs;
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EGLint lastEGLOp;
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/*
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replaced EGL_OPENGL_BIT with EGL_OPENGL_ES2_BIT
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*/
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EGLint attribs[] = {
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EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
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EGL_NONE
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};
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egl_context *e = egl_context_malloc();
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e->display = eglGetDisplay((EGLNativeDisplayType) display);
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if(EGL_NO_DISPLAY == e->display) {
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fprintf(stderr, "Couldn't get EGL display\n");
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exit(EXIT_FAILURE);
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}
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if( EGL_TRUE != eglInitialize(e->display, &major, &minor)) {
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fprintf(stderr, "Couldnt initialize EGL\n");
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exit(EXIT_FAILURE);
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}
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/* null buffer for querying the count*/
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lastEGLOp = eglChooseConfig( e->display, attribs, NULL, 1, &num_configs);
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if( EGL_TRUE != lastEGLOp) {
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exit(EXIT_FAILURE);
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}
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fprintf(stderr, "found %d matching EGL configurations\n", num_configs);
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EGLConfig *all_the_configs = malloc( num_configs * sizeof( EGLConfig));
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/* was &e->config but broken */
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lastEGLOp = eglChooseConfig( e->display, attribs, all_the_configs, num_configs, &num_configs);
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if( EGL_TRUE != lastEGLOp) {
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fprintf(stderr, "CouldnÄt find matching EGL config\n");
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exit(EXIT_FAILURE);
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}
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e->config = all_the_configs[0];
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/* added from
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https://stackoverflow.com/questions/25843368/glgetstringgl-version-returns-opengl-es-cm-1-1-but-my-phone-supports-opengl
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*/
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const EGLint context_attrib_list[] = {
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// request a context using Open GL ES 2.0
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EGL_CONTEXT_CLIENT_VERSION, 2,
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EGL_NONE
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};
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/*thanks to the dudes of stackoverflow for explaining how the attrib_list works*/
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e->context = eglCreateContext(e->display, e->config, EGL_NO_CONTEXT, context_attrib_list);
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if( EGL_NO_CONTEXT == e->context) {
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fprintf(stderr, "Couldn't create EGL context\n");
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printEGLError();
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exit(EXIT_FAILURE);
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}
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return e;
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}
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