mirror of https://github.com/xqemu/xqemu.git
133 lines
4.3 KiB
C
133 lines
4.3 KiB
C
/*
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* Offscreen OpenGL abstraction layer - GLX (X11) specific
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*
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* Copyright (c) 2013 Wayo
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* Copyright (c) 2014 Jannik Vogel
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include "gloffscreen.h"
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#include <X11/Xlib.h>
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struct _GloContext {
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GLXDrawable glx_drawable;
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GLXContext glx_context;
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};
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static Display* x_display;
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/* Create an OpenGL context */
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GloContext *glo_context_create(void)
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{
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static bool initialized = false;
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if (!initialized) {
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x_display = XOpenDisplay(0);
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printf("gloffscreen: GLX_VERSION = %s\n", glXGetClientString(x_display, GLX_VERSION));
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printf("gloffscreen: GLX_VENDOR = %s\n", glXGetClientString(x_display, GLX_VENDOR));
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} else {
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printf("gloffscreen already inited\n");
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exit(EXIT_FAILURE);
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}
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GloContext *context = (GloContext *)malloc(sizeof(GloContext));
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int fb_attribute_list[] = {
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GLX_RENDER_TYPE, GLX_RGBA_BIT,
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GLX_RED_SIZE, 8,
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GLX_GREEN_SIZE, 8,
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GLX_BLUE_SIZE, 8,
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GLX_ALPHA_SIZE, 8,
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GLX_DEPTH_SIZE, 24,
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GLX_STENCIL_SIZE, 8,
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GLX_DRAWABLE_TYPE, GLX_PBUFFER_BIT,
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None
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};
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int nelements;
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GLXFBConfig* configs = glXChooseFBConfig(x_display,
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DefaultScreen(x_display),
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fb_attribute_list, &nelements);
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if (configs == NULL) { return NULL; }
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if (nelements == 0) { return NULL; }
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#if 1
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/* Tiny surface because apitrace doesn't handle no surface yet */
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int surface_attribute_list[] = {
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GLX_PBUFFER_WIDTH,16,
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GLX_PBUFFER_HEIGHT,16,
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GLX_LARGEST_PBUFFER, True,
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None
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};
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context->glx_drawable = glXCreatePbuffer(x_display, configs[0], surface_attribute_list);
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if (context->glx_drawable == None) { return NULL; }
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#else
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context->glx_drawable = None;
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#endif
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/* Create GLX context */
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PFNGLXCREATECONTEXTATTRIBSARBPROC glXCreateContextAttribsARB =
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(PFNGLXCREATECONTEXTATTRIBSARBPROC)
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glXGetProcAddress((const GLubyte*)"glXCreateContextAttribsARB");
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if (glXCreateContextAttribsARB == NULL) {
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fprintf(stderr,"GLX doesn't support ARB_create_context extension.\n");
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exit(EXIT_FAILURE);
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}
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int context_attribute_list[] = {
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GLX_CONTEXT_MAJOR_VERSION_ARB, 3,
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GLX_CONTEXT_MINOR_VERSION_ARB, 3,
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GLX_CONTEXT_PROFILE_MASK_ARB, GLX_CONTEXT_CORE_PROFILE_BIT_ARB,
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None
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};
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context->glx_context = glXCreateContextAttribsARB(x_display, configs[0], 0, True, context_attribute_list);
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XSync(x_display, False);
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if (context->glx_context == NULL) return NULL;
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glo_set_current(context);
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/* Get rid of possible errors from within GL wrapper or glo */
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while(glGetError() != GL_NO_ERROR);
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initialized = true;
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return context;
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}
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/* Set current context */
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void glo_set_current(GloContext *context)
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{
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if (context == NULL) {
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glXMakeCurrent(x_display, None, NULL);
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} else {
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glXMakeCurrent(x_display, context->glx_drawable, context->glx_context);
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}
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}
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/* Destroy a previously created OpenGL context */
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void glo_context_destroy(GloContext *context)
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{
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if (!context) { return; }
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glo_set_current(NULL);
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glXDestroyContext(x_display, context->glx_context);
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}
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