Method R_SetupFrame

client/src/main/java/jake2/client/render/fast/Main.java:639–691

R_SetupFrame

()

	 * R_SetupFrame
	 */
	void R_SetupFrame() {
		r_framecount++;

		//	build the transformation matrix for the given view angles
		Math3D.VectorCopy(r_newrefdef.vieworg, r_origin);

		Math3D.AngleVectors(r_newrefdef.viewangles, vpn, vright, vup);

		//	current viewcluster
		mleaf_t leaf;
		if ((r_newrefdef.rdflags & Defines.RDF_NOWORLDMODEL) == 0) {
			r_oldviewcluster = r_viewcluster;
			r_oldviewcluster2 = r_viewcluster2;
			leaf = Mod_PointInLeaf(r_origin, r_worldmodel);
			r_viewcluster = r_viewcluster2 = leaf.cluster;

			// check above and below so crossing solid water doesn't draw wrong
			if (leaf.contents == 0) { // look down a bit
				Math3D.VectorCopy(r_origin, temp);
				temp[2] -= 16;
				leaf = Mod_PointInLeaf(temp, r_worldmodel);
				if ((leaf.contents & Defines.CONTENTS_SOLID) == 0 && (leaf.cluster != r_viewcluster2))
					r_viewcluster2 = leaf.cluster;
			}
			else { // look up a bit
				Math3D.VectorCopy(r_origin, temp);
				temp[2] += 16;
				leaf = Mod_PointInLeaf(temp, r_worldmodel);
				if ((leaf.contents & Defines.CONTENTS_SOLID) == 0 && (leaf.cluster != r_viewcluster2))
					r_viewcluster2 = leaf.cluster;
			}
		}

		for (int i = 0; i < 4; i++)
			v_blend[i] = r_newrefdef.blend[i];

		c_brush_polys = 0;
		c_alias_polys = 0;

		// clear out the portion of the screen that the NOWORLDMODEL defines
		if ((r_newrefdef.rdflags & Defines.RDF_NOWORLDMODEL) != 0) {
			gl.glEnable(GL_SCISSOR_TEST);
			gl.glClearColor(0.3f, 0.3f, 0.3f, 1.0f);
			gl.glScissor(
				r_newrefdef.x,
				vid.getHeight() - r_newrefdef.height - r_newrefdef.y,
				r_newrefdef.width,
				r_newrefdef.height);
			gl.glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
			gl.glClearColor(1.0f, 0.0f, 0.5f, 0.5f);
			gl.glDisable(GL_SCISSOR_TEST);
		}
	}

	/**
	 * MYgluPerspective