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xorg-x11-server/u_0011-glx-Implement-protocol-for-glXCreateContextAttribsAR.patch

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From feae6434d2653bcfcaf617932c1b4893d51a1ef4 Mon Sep 17 00:00:00 2001
From: Ian Romanick <ian.d.romanick@intel.com>
Date: Fri, 16 Dec 2011 14:44:55 -0800
Subject: [PATCH 11/11] glx: Implement protocol for glXCreateContextAttribsARB
Signed-off-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Dave Airlie <airlied@redhat.com>
Reviewed-by: Christopher James Halse Rogers <christopher.halse.rogers@canonical.com>
---
glx/createcontext.c | 213 ++++++++++++++++++++++++++++++++++++++++++++++++++-
1 files changed, 212 insertions(+), 1 deletions(-)
diff --git a/glx/createcontext.c b/glx/createcontext.c
index 9c1eab3..025c423 100644
--- a/glx/createcontext.c
+++ b/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
--
1.7.3.4
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