diff options
Diffstat (limited to 'xorg-server/glx/createcontext.c')
| -rw-r--r-- | xorg-server/glx/createcontext.c | 213 |
1 files changed, 212 insertions, 1 deletions
diff --git a/xorg-server/glx/createcontext.c b/xorg-server/glx/createcontext.c index 9c1eab3e4..025c423fe 100644 --- a/xorg-server/glx/createcontext.c +++ b/xorg-server/glx/createcontext.c @@ -24,13 +24,224 @@ #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) + +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) { - return BadRequest; + 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; + + /* 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; + + 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; + + /* 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; + + /* 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 |