xserver randrproto libxtrans fontconfig libxcb xcb-proto mesa git update 26 Jan 2014

xserver          commit c1ce807d9f18f215332d7eeb844e8c640f71c53c
libxcb           commit e7263931aff3e3450dc938ad465a7577f943549f
libxcb/xcb-proto commit d898fd39ad6c82207eb78666b2daad982dd757b5
randrproto       commit a4a6694c059d74247c16527eef4a0ec9f56bbef6
libxtrans        commit e1e6121a1638d43d9929589b4723da2b38cb6b44
fontconfig       commit e2b406053c2937799da8636c56b72a77998bcab0
mesa             commit 07149f0252c52b4ac58b6df4e307fd786b49b490

1 files changed, 612 insertions, 0 deletions

diff --git a/xorg-server/glamor/glamor_core.c b/xorg-server/glamor/glamor_core.c
new file mode 100644
index 000000000..eb1a08d43
--- /dev/null
+++ b/xorg-server/glamor/glamor_core.c
@@ -0,0 +1,612 @@
+/*
+ * Copyright © 2001 Keith Packard
+ * Copyright © 2008 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.
+ *
+ * Authors:
+ *    Eric Anholt <eric@anholt.net>
+ *
+ */
+
+/** @file glamor_core.c
+ *
+ * This file covers core X rendering in glamor.
+ */
+
+#include <stdlib.h>
+
+#include "glamor_priv.h"
+
+const Bool
+glamor_get_drawable_location(const DrawablePtr drawable)
+{
+	PixmapPtr pixmap = glamor_get_drawable_pixmap(drawable);
+	glamor_pixmap_private *pixmap_priv =
+	    glamor_get_pixmap_private(pixmap);
+	glamor_screen_private *glamor_priv =
+	    glamor_get_screen_private(drawable->pScreen);
+	if (pixmap_priv == NULL || pixmap_priv->base.gl_fbo == 0)
+		return 'm';
+	if (pixmap_priv->base.fbo->fb == glamor_priv->screen_fbo)
+		return 's';
+	else
+		return 'f';
+}
+
+GLint
+glamor_compile_glsl_prog(glamor_gl_dispatch * dispatch, GLenum type,
+			 const char *source)
+{
+	GLint ok;
+	GLint prog;
+
+	prog = dispatch->glCreateShader(type);
+	dispatch->glShaderSource(prog, 1, (const GLchar **) &source, NULL);
+	dispatch->glCompileShader(prog);
+	dispatch->glGetShaderiv(prog, GL_COMPILE_STATUS, &ok);
+	if (!ok) {
+		GLchar *info;
+		GLint size;
+
+		dispatch->glGetShaderiv(prog, GL_INFO_LOG_LENGTH, &size);
+		info = malloc(size);
+		if (info) {
+			dispatch->glGetShaderInfoLog(prog, size, NULL, info);
+			ErrorF("Failed to compile %s: %s\n",
+			       type == GL_FRAGMENT_SHADER ? "FS" : "VS", info);
+			ErrorF("Program source:\n%s", source);
+			free(info);
+		} else
+			ErrorF("Failed to get shader compilation info.\n");
+		FatalError("GLSL compile failure\n");
+	}
+
+	return prog;
+}
+
+void
+glamor_link_glsl_prog(glamor_gl_dispatch * dispatch, GLint prog)
+{
+	GLint ok;
+
+	dispatch->glLinkProgram(prog);
+	dispatch->glGetProgramiv(prog, GL_LINK_STATUS, &ok);
+	if (!ok) {
+		GLchar *info;
+		GLint size;
+
+		dispatch->glGetProgramiv(prog, GL_INFO_LOG_LENGTH, &size);
+		info = malloc(size);
+
+		dispatch->glGetProgramInfoLog(prog, size, NULL, info);
+		ErrorF("Failed to link: %s\n", info);
+		FatalError("GLSL link failure\n");
+	}
+}
+
+
+Bool
+glamor_prepare_access(DrawablePtr drawable, glamor_access_t access)
+{
+	PixmapPtr pixmap = glamor_get_drawable_pixmap(drawable);
+	return glamor_download_pixmap_to_cpu(pixmap, access);
+}
+
+/*
+ *  When downloading a unsupported color format to CPU memory,
+    we need to shuffle the color elements and then use a supported
+    color format to read it back to CPU memory.
+
+    For an example, the picture's format is PICT_b8g8r8a8,
+    Then the expecting color layout is as below (little endian):
+    0	1	2	3   : address
+    a	r	g	b
+
+    Now the in GLES2 the supported color format is GL_RGBA, type is
+    GL_UNSIGNED_TYPE, then we need to shuffle the fragment
+    color as :
+	frag_color = sample(texture).argb;
+    before we use glReadPixel to get it back.
+
+    For the uploading process, the shuffle is a revert shuffle.
+    We still use GL_RGBA, GL_UNSIGNED_BYTE to upload the color
+    to a texture, then let's see
+    0	1	2	3   : address
+    a	r	g	b   : correct colors
+    R	G	B	A   : GL_RGBA with GL_UNSIGNED_BYTE
+
+    Now we need to shuffle again, the mapping rule is
+    r = G, g = B, b = A, a = R. Then the uploading shuffle is as
+    below:
+	frag_color = sample(texture).gbar;
+*/
+
+void
+glamor_init_finish_access_shaders(ScreenPtr screen)
+{
+	glamor_screen_private *glamor_priv;
+	glamor_gl_dispatch *dispatch;
+	const char *vs_source =
+	    "attribute vec4 v_position;\n"
+	    "attribute vec4 v_texcoord0;\n"
+	    "varying vec2 source_texture;\n"
+	    "void main()\n"
+	    "{\n"
+	    "	gl_Position = v_position;\n"
+	    "	source_texture = v_texcoord0.xy;\n" "}\n";
+
+	const char *common_source =
+	    GLAMOR_DEFAULT_PRECISION
+	    "varying vec2 source_texture;\n"
+	    "uniform sampler2D sampler;\n"
+	    "uniform int revert;\n"
+	    "uniform int swap_rb;\n"
+
+	    "#define REVERT_NONE       			0\n"
+	    "#define REVERT_NORMAL     			1\n"
+	    "#define SWAP_NONE_DOWNLOADING  		0\n"
+	    "#define SWAP_DOWNLOADING  			1\n"
+	    "#define SWAP_UPLOADING	  		2\n"
+	    "#define SWAP_NONE_UPLOADING		3\n";
+
+	const char *fs_source =
+	    "void main()\n"
+	    "{\n"
+	    "   if (revert == REVERT_NONE) \n"
+	    "    { \n"
+	    "     if ((swap_rb != SWAP_NONE_DOWNLOADING) && (swap_rb != SWAP_NONE_UPLOADING))   \n"
+	    "	  	gl_FragColor = texture2D(sampler, source_texture).bgra;\n"
+	    "     else \n"
+	    "	  	gl_FragColor = texture2D(sampler, source_texture).rgba;\n"
+	    "    } \n"
+	    "   else \n"
+	    "    { \n"
+	    "     if (swap_rb == SWAP_DOWNLOADING)   \n"
+	    "	  	gl_FragColor = texture2D(sampler, source_texture).argb;\n"
+	    "     else if (swap_rb == SWAP_NONE_DOWNLOADING)\n"
+	    "	  	gl_FragColor = texture2D(sampler, source_texture).abgr;\n"
+	    "     else if (swap_rb == SWAP_UPLOADING)\n"
+	    "	  	gl_FragColor = texture2D(sampler, source_texture).gbar;\n"
+	    "     else if (swap_rb == SWAP_NONE_UPLOADING)\n"
+	    "	  	gl_FragColor = texture2D(sampler, source_texture).abgr;\n"
+	    "    } \n" "}\n";
+
+	const char *set_alpha_source =
+	    "void main()\n"
+	    "{\n"
+	    "   if (revert == REVERT_NONE) \n"
+	    "    { \n"
+	    "     if ((swap_rb != SWAP_NONE_DOWNLOADING) && (swap_rb != SWAP_NONE_UPLOADING))   \n"
+	    "	  	gl_FragColor = vec4(texture2D(sampler, source_texture).bgr, 1);\n"
+	    "     else \n"
+	    "	  	gl_FragColor = vec4(texture2D(sampler, source_texture).rgb, 1);\n"
+	    "    } \n"
+	    "   else \n"
+	    "    { \n"
+	    "     if (swap_rb == SWAP_DOWNLOADING)   \n"
+	    "	  	gl_FragColor = vec4(1, texture2D(sampler, source_texture).rgb);\n"
+	    "     else if (swap_rb == SWAP_NONE_DOWNLOADING)\n"
+	    "	  	gl_FragColor = vec4(1, texture2D(sampler, source_texture).bgr);\n"
+	    "     else if (swap_rb == SWAP_UPLOADING)\n"
+	    "	  	gl_FragColor = vec4(texture2D(sampler, source_texture).gba, 1);\n"
+	    "     else if (swap_rb == SWAP_NONE_UPLOADING)\n"
+	    "	  	gl_FragColor = vec4(texture2D(sampler, source_texture).abg, 1);\n"
+	    "    } \n"
+	    "}\n";
+	GLint fs_prog, vs_prog, avs_prog, set_alpha_prog;
+	GLint sampler_uniform_location;
+	char *source;
+
+	glamor_priv = glamor_get_screen_private(screen);
+	dispatch =  glamor_get_dispatch(glamor_priv);
+	glamor_priv->finish_access_prog[0] = dispatch->glCreateProgram();
+	glamor_priv->finish_access_prog[1] = dispatch->glCreateProgram();
+
+	vs_prog = glamor_compile_glsl_prog(dispatch, GL_VERTEX_SHADER,
+				     vs_source);
+
+	XNFasprintf(&source, "%s%s", common_source, fs_source);
+	fs_prog = glamor_compile_glsl_prog(dispatch, GL_FRAGMENT_SHADER,
+				     source);
+	free(source);
+
+	dispatch->glAttachShader(glamor_priv->finish_access_prog[0],
+				 vs_prog);
+	dispatch->glAttachShader(glamor_priv->finish_access_prog[0],
+				 fs_prog);
+
+	avs_prog = glamor_compile_glsl_prog(dispatch, GL_VERTEX_SHADER,
+				     vs_source);
+
+	XNFasprintf(&source, "%s%s", common_source, set_alpha_source);
+	set_alpha_prog = glamor_compile_glsl_prog(dispatch, GL_FRAGMENT_SHADER,
+						  source);
+	free(source);
+
+	dispatch->glAttachShader(glamor_priv->finish_access_prog[1],
+				 avs_prog);
+	dispatch->glAttachShader(glamor_priv->finish_access_prog[1],
+				 set_alpha_prog);
+
+	dispatch->glBindAttribLocation(glamor_priv->finish_access_prog[0],
+				       GLAMOR_VERTEX_POS, "v_position");
+	dispatch->glBindAttribLocation(glamor_priv->finish_access_prog[0],
+				       GLAMOR_VERTEX_SOURCE,
+				       "v_texcoord0");
+	glamor_link_glsl_prog(dispatch,
+			      glamor_priv->finish_access_prog[0]);
+
+	dispatch->glBindAttribLocation(glamor_priv->finish_access_prog[1],
+				       GLAMOR_VERTEX_POS, "v_position");
+	dispatch->glBindAttribLocation(glamor_priv->finish_access_prog[1],
+				       GLAMOR_VERTEX_SOURCE,
+				       "v_texcoord0");
+	glamor_link_glsl_prog(dispatch,
+			      glamor_priv->finish_access_prog[1]);
+
+	glamor_priv->finish_access_revert[0] =
+	    dispatch->
+	    glGetUniformLocation(glamor_priv->finish_access_prog[0],
+				 "revert");
+
+	glamor_priv->finish_access_swap_rb[0] =
+	    dispatch->
+	    glGetUniformLocation(glamor_priv->finish_access_prog[0],
+				 "swap_rb");
+	sampler_uniform_location =
+	    dispatch->
+	    glGetUniformLocation(glamor_priv->finish_access_prog[0],
+				 "sampler");
+	dispatch->glUseProgram(glamor_priv->finish_access_prog[0]);
+	dispatch->glUniform1i(sampler_uniform_location, 0);
+	dispatch->glUniform1i(glamor_priv->finish_access_revert[0], 0);
+	dispatch->glUniform1i(glamor_priv->finish_access_swap_rb[0], 0);
+	dispatch->glUseProgram(0);
+
+	glamor_priv->finish_access_revert[1] =
+	    dispatch->
+	    glGetUniformLocation(glamor_priv->finish_access_prog[1],
+				 "revert");
+	glamor_priv->finish_access_swap_rb[1] =
+	    dispatch->
+	    glGetUniformLocation(glamor_priv->finish_access_prog[1],
+				 "swap_rb");
+	sampler_uniform_location =
+	    dispatch->
+	    glGetUniformLocation(glamor_priv->finish_access_prog[1],
+				 "sampler");
+	dispatch->glUseProgram(glamor_priv->finish_access_prog[1]);
+	dispatch->glUniform1i(glamor_priv->finish_access_revert[1], 0);
+	dispatch->glUniform1i(sampler_uniform_location, 0);
+	dispatch->glUniform1i(glamor_priv->finish_access_swap_rb[1], 0);
+	dispatch->glUseProgram(0);
+	glamor_put_dispatch(glamor_priv);
+}
+
+void
+glamor_fini_finish_access_shaders(ScreenPtr screen)
+{
+	glamor_screen_private *glamor_priv;
+	glamor_gl_dispatch *dispatch;
+
+	glamor_priv = glamor_get_screen_private(screen);
+	dispatch =  glamor_get_dispatch(glamor_priv);
+	dispatch->glDeleteProgram(glamor_priv->finish_access_prog[0]);
+	dispatch->glDeleteProgram(glamor_priv->finish_access_prog[1]);
+	glamor_put_dispatch(glamor_priv);
+}
+
+void
+glamor_finish_access(DrawablePtr drawable, glamor_access_t access_mode)
+{
+	PixmapPtr pixmap = glamor_get_drawable_pixmap(drawable);
+	glamor_pixmap_private *pixmap_priv =
+	    glamor_get_pixmap_private(pixmap);
+	glamor_screen_private *glamor_priv =
+	    glamor_get_screen_private(drawable->pScreen);
+
+	if (!GLAMOR_PIXMAP_PRIV_HAS_FBO_DOWNLOADED(pixmap_priv))
+		return;
+
+	if (access_mode != GLAMOR_ACCESS_RO) {
+		glamor_restore_pixmap_to_texture(pixmap);
+	}
+
+	if (pixmap_priv->base.fbo->pbo != 0 && pixmap_priv->base.fbo->pbo_valid) {
+		glamor_gl_dispatch *dispatch;
+
+		assert(glamor_priv->gl_flavor == GLAMOR_GL_DESKTOP);
+
+		dispatch = glamor_get_dispatch(glamor_priv);
+		dispatch->glBindBuffer(GL_PIXEL_PACK_BUFFER, 0);
+		dispatch->glBindBuffer(GL_PIXEL_UNPACK_BUFFER, 0);
+		dispatch->glDeleteBuffers(1, &pixmap_priv->base.fbo->pbo);
+		glamor_put_dispatch(glamor_priv);
+
+		pixmap_priv->base.fbo->pbo_valid = FALSE;
+		pixmap_priv->base.fbo->pbo = 0;
+	} else {
+		free(pixmap->devPrivate.ptr);
+	}
+
+	if (pixmap_priv->type == GLAMOR_TEXTURE_DRM)
+		pixmap->devKind = pixmap_priv->base.drm_stride;
+
+	if (pixmap_priv->base.gl_fbo == GLAMOR_FBO_DOWNLOADED)
+		pixmap_priv->base.gl_fbo = GLAMOR_FBO_NORMAL;
+
+	pixmap->devPrivate.ptr = NULL;
+}
+
+
+/**
+ * Calls uxa_prepare_access with UXA_PREPARE_SRC for the tile, if that is the
+ * current fill style.
+ *
+ * Solid doesn't use an extra pixmap source, so we don't worry about them.
+ * Stippled/OpaqueStippled are 1bpp and can be in fb, so we should worry
+ * about them.
+ */
+Bool
+glamor_prepare_access_gc(GCPtr gc)
+{
+	if (gc->stipple) {
+		if (!glamor_prepare_access
+		    (&gc->stipple->drawable, GLAMOR_ACCESS_RO))
+			return FALSE;
+	}
+	if (gc->fillStyle == FillTiled) {
+		if (!glamor_prepare_access(&gc->tile.pixmap->drawable,
+					   GLAMOR_ACCESS_RO)) {
+			if (gc->stipple)
+				glamor_finish_access(&gc->
+						     stipple->drawable, 
+						     GLAMOR_ACCESS_RO);
+			return FALSE;
+		}
+	}
+	return TRUE;
+}
+
+/**
+ * Finishes access to the tile in the GC, if used.
+ */
+void
+glamor_finish_access_gc(GCPtr gc)
+{
+	if (gc->fillStyle == FillTiled)
+		glamor_finish_access(&gc->tile.pixmap->drawable, GLAMOR_ACCESS_RO);
+	if (gc->stipple)
+		glamor_finish_access(&gc->stipple->drawable, GLAMOR_ACCESS_RO);
+}
+
+Bool
+glamor_stipple(PixmapPtr pixmap, PixmapPtr stipple,
+	       int x, int y, int width, int height,
+	       unsigned char alu, unsigned long planemask,
+	       unsigned long fg_pixel, unsigned long bg_pixel,
+	       int stipple_x, int stipple_y)
+{
+	glamor_fallback("stubbed out stipple depth %d\n",
+			pixmap->drawable.depth);
+	return FALSE;
+}
+
+GCOps glamor_gc_ops = {
+	.FillSpans = glamor_fill_spans,
+	.SetSpans = glamor_set_spans,
+	.PutImage = glamor_put_image,
+	.CopyArea = glamor_copy_area,
+	.CopyPlane = glamor_copy_plane,
+	.PolyPoint = glamor_poly_point,
+	.Polylines = glamor_poly_lines,
+	.PolySegment = glamor_poly_segment,
+	.PolyRectangle = miPolyRectangle,
+	.PolyArc = miPolyArc,
+	.FillPolygon = miFillPolygon,
+	.PolyFillRect = glamor_poly_fill_rect,
+	.PolyFillArc = miPolyFillArc,
+	.PolyText8 = miPolyText8,
+	.PolyText16 = miPolyText16,
+	.ImageText8 = miImageText8,
+	.ImageText16 = miImageText16,
+	.ImageGlyphBlt = glamor_image_glyph_blt, //miImageGlyphBlt,
+	.PolyGlyphBlt = glamor_poly_glyph_blt, //miPolyGlyphBlt,
+	.PushPixels = glamor_push_pixels, //miPushPixels,
+};
+
+/**
+ * uxa_validate_gc() sets the ops to glamor's implementations, which may be
+ * accelerated or may sync the card and fall back to fb.
+ */
+void
+glamor_validate_gc(GCPtr gc, unsigned long changes, DrawablePtr drawable)
+{
+	/* fbValidateGC will do direct access to pixmaps if the tiling has changed.
+	 * Preempt fbValidateGC by doing its work and masking the change out, so
+	 * that we can do the Prepare/finish_access.
+	 */
+#ifdef FB_24_32BIT
+	if ((changes & GCTile) && fbGetRotatedPixmap(gc)) {
+		gc->pScreen->DestroyPixmap(fbGetRotatedPixmap(gc));
+		fbGetRotatedPixmap(gc) = 0;
+	}
+
+	if (gc->fillStyle == FillTiled) {
+		PixmapPtr old_tile, new_tile;
+
+		old_tile = gc->tile.pixmap;
+		if (old_tile->drawable.bitsPerPixel !=
+		    drawable->bitsPerPixel) {
+			new_tile = fbGetRotatedPixmap(gc);
+			if (!new_tile ||
+			    new_tile->drawable.bitsPerPixel !=
+			    drawable->bitsPerPixel) {
+				if (new_tile)
+					gc->pScreen->DestroyPixmap
+					    (new_tile);
+				/* fb24_32ReformatTile will do direct access of a newly-
+				 * allocated pixmap.
+				 */
+				glamor_fallback
+				    ("GC %p tile FB_24_32 transformat %p.\n",
+				     gc, old_tile);
+
+				if (glamor_prepare_access
+				    (&old_tile->drawable,
+				     GLAMOR_ACCESS_RO)) {
+					new_tile =
+					    fb24_32ReformatTile
+					    (old_tile,
+					     drawable->bitsPerPixel);
+					glamor_finish_access
+					    (&old_tile->drawable, GLAMOR_ACCESS_RO);
+				}
+			}
+			if (new_tile) {
+				fbGetRotatedPixmap(gc) = old_tile;
+				gc->tile.pixmap = new_tile;
+				changes |= GCTile;
+			}
+		}
+	}
+#endif
+	if (changes & GCTile) {
+		if (!gc->tileIsPixel) {
+			glamor_pixmap_private *pixmap_priv =
+			    glamor_get_pixmap_private(gc->tile.pixmap);
+			if ((!GLAMOR_PIXMAP_PRIV_HAS_FBO(pixmap_priv))
+			    && FbEvenTile(gc->tile.pixmap->drawable.width *
+					  drawable->bitsPerPixel)) {
+				glamor_fallback
+				    ("GC %p tile changed %p.\n", gc,
+				     gc->tile.pixmap);
+				if (glamor_prepare_access
+				    (&gc->tile.pixmap->drawable,
+				     GLAMOR_ACCESS_RW)) {
+					fbPadPixmap(gc->tile.pixmap);
+					glamor_finish_access
+					    (&gc->tile.pixmap->drawable, GLAMOR_ACCESS_RW);
+				}
+			}
+		}
+		/* Mask out the GCTile change notification, now that we've done FB's
+		 * job for it.
+		 */
+		changes &= ~GCTile;
+	}
+
+	if (changes & GCStipple && gc->stipple) {
+		/* We can't inline stipple handling like we do for GCTile because
+		 * it sets fbgc privates.
+		 */
+		if (glamor_prepare_access
+		    (&gc->stipple->drawable, GLAMOR_ACCESS_RW)) {
+			fbValidateGC(gc, changes, drawable);
+			glamor_finish_access(&gc->stipple->drawable, GLAMOR_ACCESS_RW);
+		}
+	} else {
+		fbValidateGC(gc, changes, drawable);
+	}
+
+	gc->ops = &glamor_gc_ops;
+}
+
+static GCFuncs glamor_gc_funcs = {
+	glamor_validate_gc,
+	miChangeGC,
+	miCopyGC,
+	miDestroyGC,
+	miChangeClip,
+	miDestroyClip,
+	miCopyClip
+};
+
+/**
+ * exaCreateGC makes a new GC and hooks up its funcs handler, so that
+ * exaValidateGC() will get called.
+ */
+int
+glamor_create_gc(GCPtr gc)
+{
+	if (!fbCreateGC(gc))
+		return FALSE;
+
+	gc->funcs = &glamor_gc_funcs;
+
+	return TRUE;
+}
+
+RegionPtr
+glamor_bitmap_to_region(PixmapPtr pixmap)
+{
+	RegionPtr ret;
+	glamor_fallback("pixmap %p \n", pixmap);
+	if (!glamor_prepare_access(&pixmap->drawable, GLAMOR_ACCESS_RO))
+		return NULL;
+	ret = fbPixmapToRegion(pixmap);
+	glamor_finish_access(&pixmap->drawable, GLAMOR_ACCESS_RO);
+	return ret;
+}
+
+/* Borrow from cairo. */
+Bool
+glamor_gl_has_extension(const char *extension)
+{
+	const char *pext;
+	int ext_len;
+	ext_len = strlen(extension);
+
+	pext = (const char*)glGetString(GL_EXTENSIONS);
+
+	if (pext == NULL || extension == NULL)
+		return FALSE;
+
+	while ((pext = strstr(pext, extension)) != NULL) {
+		if (pext[ext_len] == ' ' || pext[ext_len] == '\0')
+			return TRUE;
+		pext += ext_len;
+	}
+	return FALSE;
+}
+
+int
+glamor_gl_get_version(void)
+{
+	int major, minor;
+	const char *version = (const char *) glGetString(GL_VERSION);
+	const char *dot = version == NULL ? NULL : strchr(version, '.');
+	const char *major_start = dot;
+
+	/* Sanity check */
+	if (dot == NULL || dot == version || *(dot + 1) == '\0') {
+		major = 0;
+		minor = 0;
+	} else {
+		/* Find the start of the major version in the string */
+		while (major_start > version && *major_start != ' ')
+			--major_start;
+		major = strtol(major_start, NULL, 10);
+		minor = strtol(dot + 1, NULL, 10);
+	}
+
+	return GLAMOR_GL_VERSION_ENCODE(major, minor);
+}