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IABSD.fr/xenocara/xserver/glx/createcontext.c
matthieu
- xserver/glx/createcontext.c
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/* * Copyright © 2011 Intel Corporation * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the "Software"), * to deal in the Software without restriction, including without limitation * the rights to use, copy, modify, merge, publish, distribute, sublicense, * and/or sell copies of the Software, and to permit persons to whom the * Software is furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice (including the next * paragraph) shall be included in all copies or substantial portions of the * Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER * DEALINGS IN THE SOFTWARE. */ #ifdef HAVE_DIX_CONFIG_H #include <dix-config.h> #endif #include <GL/glxtokens.h> #include "glxserver.h" #include "glxext.h" #include "indirect_dispatch.h" #define ALL_VALID_FLAGS \ (GLX_CONTEXT_DEBUG_BIT_ARB | GLX_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB \ | GLX_CONTEXT_ROBUST_ACCESS_BIT_ARB) static Bool validate_GL_version(int major_version, int minor_version) { if (major_version <= 0 || minor_version < 0) return False; switch (major_version) { case 1: if (minor_version > 5) return False; break; case 2: if (minor_version > 1) return False; break; case 3: if (minor_version > 3) return False; break; default: break; } return True; } static Bool validate_render_type(uint32_t render_type) { switch (render_type) { case GLX_RGBA_TYPE: case GLX_COLOR_INDEX_TYPE: return True; default: return False; } } int __glXDisp_CreateContextAttribsARB(__GLXclientState * cl, GLbyte * pc) { ClientPtr client = cl->client; xGLXCreateContextAttribsARBReq *req = (xGLXCreateContextAttribsARBReq *) pc; int32_t *attribs = (req->numAttribs != 0) ? (int32_t *) (req + 1) : NULL; unsigned i; int major_version = 1; int minor_version = 0; uint32_t flags = 0; uint32_t render_type = GLX_RGBA_TYPE; __GLXcontext *ctx = NULL; __GLXcontext *shareCtx = NULL; __GLXscreen *glxScreen; __GLXconfig *config; int err; /* The GLX_ARB_create_context_robustness spec says: * * "The default value for GLX_CONTEXT_RESET_NOTIFICATION_STRATEGY_ARB * is GLX_NO_RESET_NOTIFICATION_ARB." */ int reset = GLX_NO_RESET_NOTIFICATION_ARB; /* The GLX_ARB_create_context_profile spec says: * * "The default value for GLX_CONTEXT_PROFILE_MASK_ARB is * GLX_CONTEXT_CORE_PROFILE_BIT_ARB." * * The core profile only makes sense for OpenGL versions 3.2 and later. * If the version ultimately specified is less than 3.2, the core profile * bit is cleared (see below). */ int profile = GLX_CONTEXT_CORE_PROFILE_BIT_ARB; /* Verify that the size of the packet matches the size inferred from the * sizes specified for the various fields. */ const unsigned expected_size = (sz_xGLXCreateContextAttribsARBReq + (req->numAttribs * 8)) / 4; if (req->length != expected_size) return BadLength; LEGAL_NEW_RESOURCE(req->context, client); /* The GLX_ARB_create_context spec says: * * "* If <config> is not a valid GLXFBConfig, GLXBadFBConfig is * generated." * * On the client, the screen comes from the FBConfig, so GLXBadFBConfig * should be issued if the screen is nonsense. */ if (!validGlxScreen(client, req->screen, &glxScreen, &err)) return __glXError(GLXBadFBConfig); if (!validGlxFBConfig(client, glxScreen, req->fbconfig, &config, &err)) return __glXError(GLXBadFBConfig); /* Validate the context with which the new context should share resources. */ if (req->shareList != None) { if (!validGlxContext(client, req->shareList, DixReadAccess, &shareCtx, &err)) return err; /* The crazy condition is because C doesn't have a logical XOR * operator. Comparing directly for equality may fail if one is 1 and * the other is 2 even though both are logically true. */ if (!!req->isDirect != !!shareCtx->isDirect) { client->errorValue = req->shareList; return BadMatch; } /* The GLX_ARB_create_context spec says: * * "* If the server context state for <share_context>...was * created on a different screen than the one referenced by * <config>...BadMatch is generated." */ if (glxScreen != shareCtx->pGlxScreen) { client->errorValue = shareCtx->pGlxScreen->pScreen->myNum; return BadMatch; } } for (i = 0; i < req->numAttribs; i++) { switch (attribs[i * 2]) { case GLX_CONTEXT_MAJOR_VERSION_ARB: major_version = attribs[2 * i + 1]; break; case GLX_CONTEXT_MINOR_VERSION_ARB: minor_version = attribs[2 * i + 1]; break; case GLX_CONTEXT_FLAGS_ARB: flags = attribs[2 * i + 1]; break; case GLX_RENDER_TYPE: render_type = attribs[2 * i + 1]; break; case GLX_CONTEXT_PROFILE_MASK_ARB: profile = attribs[2 * i + 1]; break; case GLX_CONTEXT_RESET_NOTIFICATION_STRATEGY_ARB: reset = attribs[2 * i + 1]; if (reset != GLX_NO_RESET_NOTIFICATION_ARB && reset != GLX_LOSE_CONTEXT_ON_RESET_ARB) return BadValue; break; default: return BadValue; } } /* The GLX_ARB_create_context spec says: * * "If attributes GLX_CONTEXT_MAJOR_VERSION_ARB and * GLX_CONTEXT_MINOR_VERSION_ARB, when considered together * with attributes GLX_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB and * GLX_RENDER_TYPE, specify an OpenGL version and feature set * that are not defined, BadMatch is generated. * * ...Feature deprecation was introduced with OpenGL 3.0, so * forward-compatible contexts may only be requested for * OpenGL 3.0 and above. Thus, examples of invalid * combinations of attributes include: * * - Major version < 1 or > 3 * - Major version == 1 and minor version < 0 or > 5 * - Major version == 2 and minor version < 0 or > 1 * - Major version == 3 and minor version > 2 * - Forward-compatible flag set and major version < 3 * - Color index rendering and major version >= 3" */ if (!validate_GL_version(major_version, minor_version)) return BadMatch; if (major_version < 3 && ((flags & GLX_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB) != 0)) return BadMatch; if (major_version >= 3 && render_type == GLX_COLOR_INDEX_TYPE) return BadMatch; if (!validate_render_type(render_type)) return BadValue; if ((flags & ~ALL_VALID_FLAGS) != 0) return BadValue; /* The GLX_ARB_create_context_profile spec says: * * "* If attribute GLX_CONTEXT_PROFILE_MASK_ARB has no bits set; has * any bits set other than GLX_CONTEXT_CORE_PROFILE_BIT_ARB and * GLX_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB; has more than one of * these bits set; or if the implementation does not support the * requested profile, then GLXBadProfileARB is generated." */ switch (profile) { case GLX_CONTEXT_CORE_PROFILE_BIT_ARB: case GLX_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB: break; case GLX_CONTEXT_ES2_PROFILE_BIT_EXT: /* The GLX_EXT_create_context_es2_profile spec says: * * "... If the version requested is 2.0, and the * GLX_CONTEXT_ES2_PROFILE_BIT_EXT bit is set in the * GLX_CONTEXT_PROFILE_MASK_ARB attribute (see below), then the * context returned will implement OpenGL ES 2.0." * * It also says: * * "* If attribute GLX_CONTEXT_PROFILE_MASK_ARB has no bits set; * has any bits set other than * GLX_CONTEXT_CORE_PROFILE_BIT_ARB, * GLX_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB, or * GLX_CONTEXT_ES2_PROFILE_BIT_EXT; has more than one of these * bits set; or if the implementation does not supported the * requested profile, then GLXBadProfileARB is generated." * * It does not specifically say what is supposed to happen if * GLX_CONTEXT_ES2_PROFILE_BIT_EXT is set but the version requested is * not 2.0. We choose to generate GLXBadProfileARB as this matches * NVIDIA's behavior. */ if (major_version != 2 || minor_version != 0) return __glXError(GLXBadProfileARB); break; default: return __glXError(GLXBadProfileARB); } /* The GLX_ARB_create_context_robustness spec says: * * "* If the reset notification behavior of <share_context> and the * newly created context are different, BadMatch is generated." */ if (shareCtx != NULL && shareCtx->resetNotificationStrategy != reset) return BadMatch; /* There is no GLX protocol for desktop OpenGL versions after 1.4. There * is no GLX protocol for any version of OpenGL ES. If the application is * requested an indirect rendering context for a version that cannot be * satisfied, reject it. * * The GLX_ARB_create_context spec says: * * "* If <config> does not support compatible OpenGL contexts * providing the requested API major and minor version, * forward-compatible flag, and debug context flag, GLXBadFBConfig * is generated." */ if (!req->isDirect && (major_version > 1 || minor_version > 4 || profile == GLX_CONTEXT_ES2_PROFILE_BIT_EXT)) { return __glXError(GLXBadFBConfig); } /* Allocate memory for the new context */ if (req->isDirect) { ctx = __glXdirectContextCreate(glxScreen, config, shareCtx); err = BadAlloc; } else { ctx = glxScreen->createContext(glxScreen, config, shareCtx, req->numAttribs, (uint32_t *) attribs, &err); } if (ctx == NULL) return err; ctx->pGlxScreen = glxScreen; ctx->config = config; ctx->id = req->context; ctx->share_id = req->shareList; ctx->idExists = True; ctx->isCurrent = False; ctx->isDirect = req->isDirect; ctx->hasUnflushedCommands = False; ctx->renderMode = GL_RENDER; ctx->feedbackBuf = NULL; ctx->feedbackBufSize = 0; ctx->selectBuf = NULL; ctx->selectBufSize = 0; ctx->drawPriv = NULL; ctx->readPriv = NULL; ctx->resetNotificationStrategy = reset; /* Add the new context to the various global tables of GLX contexts. */ if (!__glXAddContext(ctx)) { (*ctx->destroy) (ctx); client->errorValue = req->context; return BadAlloc; } return Success; } int __glXDispSwap_CreateContextAttribsARB(__GLXclientState * cl, GLbyte * pc) { return BadRequest; }