+
+
+
+/**
+ * Specified by the GL_EXT_depth_bounds_test extension.
+ */
+void GLAPIENTRY
+_mesa_DepthBoundsEXT( GLclampd zmin, GLclampd zmax )
+{
+ GET_CURRENT_CONTEXT(ctx);
+ ASSERT_OUTSIDE_BEGIN_END(ctx);
+
+ if (zmin > zmax) {
+ _mesa_error(ctx, GL_INVALID_VALUE, "glDepthBoundsEXT(zmin > zmax)");
+ return;
+ }
+
+ zmin = CLAMP(zmin, 0.0, 1.0);
+ zmax = CLAMP(zmax, 0.0, 1.0);
+
+ if (ctx->Depth.BoundsMin == zmin && ctx->Depth.BoundsMax == zmax)
+ return;
+
+ FLUSH_VERTICES(ctx, _NEW_DEPTH);
+ ctx->Depth.BoundsMin = (GLfloat) zmin;
+ ctx->Depth.BoundsMax = (GLfloat) zmax;
+}
+
+
+/**********************************************************************/
+/***** Initialization *****/
+/**********************************************************************/
+
+
+/**
+ * Initialize the depth buffer attribute group in the given context.
+ */
+void _mesa_init_depth( GLcontext * ctx )
+{
+ /* Depth buffer group */
+ ctx->Depth.Test = GL_FALSE;
+ ctx->Depth.Clear = 1.0;
+ ctx->Depth.Func = GL_LESS;
+ ctx->Depth.Mask = GL_TRUE;
+ ctx->Depth.OcclusionTest = GL_FALSE;
+
+ /* XXX this is now per-framebuffer state */
+#if 00
+ /* Z buffer stuff */
+ if (ctx->Visual.depthBits == 0) {
+ /* Special case. Even if we don't have a depth buffer we need
+ * good values for DepthMax for Z vertex transformation purposes
+ * and for per-fragment fog computation.
+ */
+ ctx->DepthMax = (1 << 16) - 1;
+ ctx->DepthMaxF = (GLfloat) ctx->DepthMax;
+ }
+ else if (ctx->Visual.depthBits < 32) {
+ ctx->DepthMax = (1 << ctx->Visual.depthBits) - 1;
+ ctx->DepthMaxF = (GLfloat) ctx->DepthMax;
+ }
+ else {
+ /* Special case since shift values greater than or equal to the
+ * number of bits in the left hand expression's type are undefined.
+ */
+ ctx->DepthMax = 0xffffffff;
+ ctx->DepthMaxF = (GLfloat) ctx->DepthMax;
+ }
+ ctx->MRD = 1.0; /* Minimum resolvable depth value, for polygon offset */
+#endif
+}