diff options
Diffstat (limited to 'common/ogl_ctx.c')
| -rw-r--r-- | common/ogl_ctx.c | 253 |
1 files changed, 253 insertions, 0 deletions
diff --git a/common/ogl_ctx.c b/common/ogl_ctx.c new file mode 100644 index 00000000..6b175115 --- /dev/null +++ b/common/ogl_ctx.c @@ -0,0 +1,253 @@ +/* + Copyright (C) 2009 Red Hat, Inc. + + This program is free software; you can redistribute it and/or + modify it under the terms of the GNU General Public License as + published by the Free Software Foundation; either version 2 of + the License, or (at your option) any later version. + + This program 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 General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see <http://www.gnu.org/licenses/>. +*/ + +#include <stdlib.h> +#include <stdio.h> +#include <X11/Xlib.h> +#include <GL/glx.h> + +#include "ogl_ctx.h" + + +#define PANIC(str) { \ + printf("%s: panic: %s", __FUNCTION__, str); \ + abort(); \ +} + +enum { + OGLCTX_TYPE_PBUF, + OGLCTX_TYPE_PIXMAP, +}; + +struct OGLCtx { + int type; + Display *x_display; + GLXContext glx_context; + GLXDrawable drawable; +}; + +typedef struct OGLPixmapCtx { + OGLCtx base; + Pixmap pixmap; +} OGLPixmapCtx; + + + +const char *oglctx_type_str(OGLCtx *ctx) +{ + static const char *pbuf_str = "pbuf"; + static const char *pixmap_str = "pixmap"; + static const char *invalid_str = "invalid"; + + switch (ctx->type) { + case OGLCTX_TYPE_PBUF: + return pbuf_str; + case OGLCTX_TYPE_PIXMAP: + return pixmap_str; + default: + return invalid_str; + } +} + +void oglctx_make_current(OGLCtx *ctx) +{ + if (!glXMakeCurrent(ctx->x_display, ctx->drawable, ctx->glx_context)) { + printf("%s: failed\n", __FUNCTION__); + } +} + +OGLCtx *pbuf_create(int width, int heigth) +{ + OGLCtx *ctx; + Display *x_display; + int num_configs; + GLXFBConfig *fb_config; + GLXPbuffer glx_pbuf; + GLXContext glx_context; + + const int glx_attributes[] = { GLX_RENDER_TYPE, GLX_RGBA_BIT, + GLX_DRAWABLE_TYPE, GLX_PBUFFER_BIT, + GLX_RED_SIZE, 8, + GLX_GREEN_SIZE, 8, + GLX_BLUE_SIZE, 8, + GLX_ALPHA_SIZE, 8, + GLX_STENCIL_SIZE, 4, + 0 }; + + int pbuf_attrib[] = { GLX_PRESERVED_CONTENTS, True, + GLX_PBUFFER_WIDTH, width, + GLX_PBUFFER_HEIGHT, heigth, + GLX_LARGEST_PBUFFER, False, + 0, 0 }; + + if (!(ctx = calloc(1, sizeof(*ctx)))) { + printf("%s: alloc pbuf failed\n", __FUNCTION__); + return NULL; + } + + if (!(x_display = XOpenDisplay(NULL))) { + printf("%s: open display failed\n", __FUNCTION__); + goto error_1; + } + + if (!(fb_config = glXChooseFBConfig(x_display, 0, glx_attributes, &num_configs)) || + !num_configs) { + printf("%s: choose fb config failed\n", __FUNCTION__); + goto error_2; + } + + if (!(glx_pbuf = glXCreatePbuffer(x_display, fb_config[0], pbuf_attrib))) { + goto error_3; + } + + if (!(glx_context = glXCreateNewContext(x_display, fb_config[0], GLX_RGBA_TYPE, NULL, True))) { + printf("%s: create context failed\n", __FUNCTION__); + goto error_4; + } + + XFree(fb_config); + + ctx->type = OGLCTX_TYPE_PBUF; + ctx->drawable = glx_pbuf; + ctx->glx_context = glx_context; + ctx->x_display = x_display; + + return ctx; + +error_4: + glXDestroyPbuffer(x_display, glx_pbuf); + +error_3: + XFree(fb_config); + +error_2: + XCloseDisplay(x_display); + +error_1: + free(ctx); + + return NULL; +} + +OGLCtx *pixmap_create(int width, int heigth) +{ + Display *x_display; + int num_configs; + GLXFBConfig *fb_config; + GLXPixmap glx_pixmap; + GLXContext glx_context; + Pixmap pixmap; + int screen; + Window root_window; + OGLPixmapCtx *pix; + + const int glx_attributes[] = { GLX_RENDER_TYPE, GLX_RGBA_BIT, + GLX_DRAWABLE_TYPE, GLX_PIXMAP_BIT, + GLX_RED_SIZE, 8, + GLX_GREEN_SIZE, 8, + GLX_BLUE_SIZE, 8, + GLX_ALPHA_SIZE, 8, + GLX_STENCIL_SIZE, 4, + 0 }; + + if (!(pix = calloc(1, sizeof(*pix)))) { + printf("%s: alloc pix failed\n", __FUNCTION__); + return NULL; + } + + if (!(x_display = XOpenDisplay(NULL))) { + printf("%s: open display failed\n", __FUNCTION__); + goto error_1; + } + + screen = DefaultScreen(x_display); + root_window = RootWindow(x_display, screen); + + if (!(fb_config = glXChooseFBConfig(x_display, 0, glx_attributes, &num_configs)) || + !num_configs) { + printf("%s: choose fb config failed\n", __FUNCTION__); + goto error_2; + } + + if (!(pixmap = XCreatePixmap(x_display, root_window, width, heigth, 32 /*use fb config*/))) { + printf("%s: create x pixmap failed\n", __FUNCTION__); + goto error_3; + } + + if (!(glx_pixmap = glXCreatePixmap(x_display, fb_config[0], pixmap, NULL))) { + printf("%s: create glx pixmap failed\n", __FUNCTION__); + goto error_4; + } + + + if (!(glx_context = glXCreateNewContext(x_display, fb_config[0], GLX_RGBA_TYPE, NULL, True))) { + printf("%s: create context failed\n", __FUNCTION__); + goto error_5; + } + + XFree(fb_config); + + pix->base.type = OGLCTX_TYPE_PIXMAP; + pix->base.x_display = x_display; + pix->base.drawable = glx_pixmap; + pix->base.glx_context = glx_context; + pix->pixmap = pixmap; + + return &pix->base; + +error_5: + glXDestroyPixmap(x_display, glx_pixmap); + +error_4: + XFreePixmap(x_display, pixmap); + +error_3: + XFree(fb_config); + +error_2: + XCloseDisplay(x_display); + +error_1: + free(pix); + + return NULL; +} + +void oglctx_destroy(OGLCtx *ctx) +{ + if (!ctx) { + return; + } + // test is current ? + + glXDestroyContext(ctx->x_display, ctx->glx_context); + switch (ctx->type) { + case OGLCTX_TYPE_PBUF: + glXDestroyPbuffer(ctx->x_display, ctx->drawable); + break; + case OGLCTX_TYPE_PIXMAP: + glXDestroyPixmap(ctx->x_display, ctx->drawable); + XFreePixmap(ctx->x_display, ((OGLPixmapCtx *)ctx)->pixmap); + break; + default: + PANIC("invalid ogl ctx type"); + } + + XCloseDisplay(ctx->x_display); + free(ctx); +} + |